S-tube punching and flanging mechanism for four-way valve pipe and punching and flanging machine equipped with such mechanism.

Abstract

This utility model belongs to the field of processing technology for four-way valve pipes, and specifically relates to a punching and flanging mechanism for S-shaped tubes of four-way valve pipes and a punching and flanging machine equipped with this mechanism, which solves the problem of low automation in processing. This punching and flanging machine for S-shaped tubes of four-way valve pipes includes a frame, on which are mounted a feeding mechanism, a transfer mechanism, a receiving mechanism, a punching and flanging mechanism, and a transfer mechanism. A direction detection and adjustment structure is provided between the feeding mechanism and the transfer mechanism to detect the orientation of the large and small ends of the S-shaped tube and rotate it 180 degrees as needed to adjust the orientation. The S-shaped tube punching and flanging mechanism includes a feeding table, a punching mechanism, and a splicing mandrel mechanism. This achieves automated processing from feeding – adjusting the orientation of the large and small ends – receiving and adjusting the axial position – punching and flanging, improving processing efficiency and safety.

Description

Technical Field

[0001] This utility model belongs to the field of processing technology of four-way valve tubes, and specifically relates to an S-tube punching and flanging mechanism for four-way valve tubes and a punching and flanging machine equipped with the mechanism. Background Technology

[0002] The four-way valve consists of a valve body and an S-tube connected to the valve body. The S-tube is a straight tube with one end having a larger outer diameter. A connection hole for connecting the capillary tube needs to be machined on the S-tube. To ensure the sealing and stability of the connection, the connection hole is generally provided with an inner flange.

[0003] In existing technologies, most S-tube punching and flanging processes generally require manual loading, placing the S-tube in the corresponding position for punching and flanging, and removing it after processing. This method requires a large amount of manual labor, resulting in low processing efficiency. Moreover, manual loading and unloading also pose significant safety risks, making it difficult to complete the processing task efficiently and safely. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an S-tube punching and flanging mechanism for a four-way valve tube.

[0005] To achieve the innovative objectives of this utility model, the following technical solutions can be used: A punching and flanging mechanism for an S-tube of a four-way valve pipe, mounted on a frame, includes: A feeding platform, wherein the feeding platform is provided with a feeding groove for placing the S-tube to be processed; The punching mechanism is capable of moving the punch above the feeding trough and punching and flanging the S-tube. The assembled mandrel mechanism includes an upper mandrel and a lower mandrel located in the two axial directions of the S-tube and capable of being inserted into the S-tube. The upper mandrel and the lower mandrel are assembled into a cylindrical mandrel, and the cylindrical mandrel is provided with a through hole corresponding to the punching direction of the punch.

[0006] This utility model's punching and flanging mechanism is used to punch and flange the S-tube of a four-way valve. The S-tube is a straight tube with a large outer diameter at one end. In this mechanism, the feeding table provides a feeding trough where the S-tube is placed for processing. The punching mechanism processes the corresponding position of the S-tube using a punch. To provide some internal support for the tube wall during punching and flanging, the frame is also equipped with a splicing mandrel mechanism. The upper and lower mandrels are inserted from both ends of the S-tube and assembled into a roughly cylindrical mandrel inside the S-tube. The cylindrical mandrel is supported inside the S-tube and has a through hole adapted to the position and extension direction of the punch. The punch punches through the S-tube and extends into the through hole. The upper edge of the through hole can also bend and guide the flanging process.

[0007] In the above-mentioned S-tube punching and flanging mechanism of the four-way valve tube, the upper mandrel and the lower mandrel are provided with mutually parallel inclined cut surfaces on opposite sides of the front end, the upper mandrel is provided with a vertical through hole, and the lower mandrel is provided with a vertical through hole. The upper through hole is a round hole, and its axial cross-section is T-shaped, with the upper part being larger than the lower part; The lower through hole is a waist hole, and its length direction is adapted to the axial direction of the lower core rod; When the upper and lower core rods are joined together, the two inclined cut surfaces are in contact with each other, and the orthographic projection of the upper through hole is located inside the lower through hole.

[0008] The axial direction of the upper and lower mandrels coincides with the horizontal plane, and the inclined cut surfaces are inclined relative to the horizontal plane. That is, the front ends of the upper and lower mandrels are conical. When the two are joined together, the two inclined cut surfaces are in contact. As they slide closer together, the upper and lower mandrels are pushed outward radially, achieving the effect of the cylindrical mandrel being supported inside the tube. Of course, in order to guide the insertion of the S-tube, chamfers are provided at the front ends of both the upper and lower mandrels.

[0009] Regarding the through holes, the upper through hole of the upper mandrel is circular and adapted to the size and position of the punch, while the lower through hole of the lower mandrel is waist-shaped. The length direction of the waist hole is adapted to the extension and retraction direction of the lower mandrel, ensuring that the upper through hole can pass through downwards. Moreover, the upper through hole is T-shaped and consists of two sections with different inner diameters. The upper section has a larger inner diameter, and the annular step between the two sections can position the flange.

[0010] In the above-mentioned S-tube punching and flanging mechanism for the four-way valve tube, the assembled mandrel mechanism includes a first sliding seat and a second sliding seat slidably connected to the frame. An upper mandrel is mounted on the first sliding seat via a first vertical platform, and a lower mandrel is mounted on the second sliding seat via a second vertical platform. The upper mandrel, the lower mandrel, and the feeding chute are arranged coaxially. The first sliding seat and the second sliding seat are located at both ends of the feeding table and can move relative to the feeding table under the action of a translational driver. The first vertical platform is slidably connected to an upper mandrel mounting block that can be vertically raised and lowered, and the rear end of the upper mandrel is fixed to the upper mandrel mounting block. The second vertical platform is slidably connected to a lower mandrel mounting block that can be vertically raised and lowered, and the rear end of the lower mandrel is fixed to the lower mandrel mounting block. An adaptive lifting structure is provided between the upper mandrel mounting block and the first vertical platform, and between the lower mandrel mounting block and the second vertical platform, which can keep the upper or lower mandrel at a predetermined height and can be raised and lowered adaptively.

[0011] Both the first and second sliding seats slide on the frame and are distributed in two axial directions of the S-tube. Both can be driven by a translational actuator, such as a cylinder. The first sliding seat is provided with a first vertical platform, and an upper mandrel mounting block is slidably connected to the first vertical platform. The upper mandrel is fixed on the upper mandrel mounting block. The adaptive lifting structure allows the upper mandrel to have a small range of lifting capability, but it can be stabilized at a height adapted to the S-tube when no external force is applied. The lower mandrel is similarly provided on the second sliding seat. This ensures that when the upper and lower mandrels are joined together, especially when the two inclined cut surfaces are in contact and sliding relative to each other, the upper and lower mandrels can maintain a horizontal state and lift appropriately, ensuring the fit of the two inclined cut surfaces and also ensuring the inner support fit of the arc-shaped sidewall of the mandrel with the inner wall of the S-tube.

[0012] In the above-mentioned S-tube punching and flanging mechanism of the four-way valve pipe, the adaptive lifting structure includes a positioning spring, which is sleeved on the screw. The first and second vertical platforms are detachably provided with screw adjustment seats on their sides. The bottom of the upper mandrel mounting block and the lower mandrel mounting block are provided with screw holes. The screw adjustment seat is provided with a vertically penetrating screw groove. The screw passes through the screw groove upwards, and the large head is limited to the lower part of the screw adjustment seat. The front end of the screw engages with the screw hole. The two ends of the positioning spring abut against the screw adjustment seat and the upper mandrel mounting block or the lower mandrel mounting block, respectively.

[0013] The adaptive lifting structures of the upper and lower mandrel mounting seats are basically similar; the adaptive lifting structure of the upper mandrel mounting seat will be described here. A positioning spring is fitted onto the screw shank, and the screw is screwed vertically upwards onto the bottom of the upper mandrel mounting seat. A screw adjusting seat is detachably installed on the side of the first vertical platform, located below the upper mandrel mounting seat. The screw shank passes through the screw groove of the screw adjusting seat, and the outer diameter of the large head is larger than the width of the screw groove. The positioning spring provides an upward elastic force to the upper mandrel mounting seat. Furthermore, the large head of the screw on the upper mandrel mounting base is in a certain gap with the bottom surface of the screw adjusting base, while the large head of the screw on the lower mandrel mounting base is in contact with the bottom surface of the screw adjusting base. This means that the upper mandrel mounting base has a certain self-adaptive lifting capability, ensuring smooth docking of the upper and lower mandrels. In addition, since the S-tube will turn inward after punching, in order to facilitate the smooth withdrawal of the upper mandrel, this mechanism is also equipped with a corresponding mold release structure, which can push the S-tube upward so that the turned-out edge leaves the upper through hole. During the upward pushing process, the upper mandrel can rise adaptively, which also prevents it from being broken upward by the S-tube.

[0014] In the above-mentioned S-tube punching and flanging mechanism of the four-way valve tube, an adaptive rotation structure and an adaptive swing structure are provided between the lower mandrel and the lower mandrel mounting block. The adaptive rotation structure includes a bearing groove on the front side of the lower mandrel mounting block and a bearing assembly fitted in the bearing groove. The handle of the lower mandrel is fixedly connected to the inner ring of the bearing assembly. An annular pressure cap is detachably provided on the outer side of the bearing groove. An axially extending inner limiting surface is provided on the inner wall of the annular pressure cap. An axially extending outer limiting surface is provided on the outer wall of the handle. The handle passes through the inner hole. The inner limiting surface and the outer limiting surface are opposite to each other and there is a rotation gap between them that allows the handle to rotate within a certain range. The adaptive swing structure includes a tenon and a groove respectively disposed at the rear end of the rod body and the front end of the handle of the lower core rod. The tenon includes a circular part and a connecting section connecting the circular part and the rod body. The groove is adapted to the shape of the tenon and extends in the horizontal direction. The tenon is embedded in the groove. Swing gaps are provided between the rear end face of the rod body and the front end face of the handle, as well as between the connecting section and the groove, to allow the rod body to swing and rotate within a certain range. The rod body has a positioning ring sleeved at its front end. A limiting structure is provided between the positioning ring and the rod body to limit the axial movement range of the positioning ring. A push spring is provided between the positioning ring and the annular pressure cap. The front end of the positioning ring abuts against the end face of the S-tube.

[0015] The adaptive rotation structure allows the lower mandrel to rotate circumferentially, while the adaptive oscillation structure allows it to oscillate, ensuring smooth docking of the two inclined surfaces. Specifically, for adaptive rotation, the bearing assembly uses a deep groove ball bearing, with its outer ring secured in the bearing groove on the front side of the lower mandrel mounting block. The shank of the lower mandrel is fixed in the inner ring, enabling rotation. The outer side of the bearing groove is sealed by an annular cap to prevent the bearing assembly from dislodging. To limit the rotation of the lower mandrel to a small range, corresponding inner and outer limiting surfaces are provided on the inner hole of the annular cap and the outer wall of the shank. However, the inner and outer limiting surfaces are not completely in contact; there is a certain gap between them, allowing for a small range of rotation of the shank. In terms of adaptive swing, the body and handle of the lower core rod are detachably connected by a tenon and a groove. The tenon has a thinner connecting section and a larger circular part. The groove is a complementary shape, but the connecting section is slightly thinner than the corresponding position on the groove, so that the connecting section can move up and down to a certain extent. The circular part rotates exactly in the groove, thus realizing the up and down swing of the lower core rod, and the swing range is small.

[0016] Furthermore, to position the S-tube on the discharge trough axially, a positioning ring is fitted at the front end of the lower mandrel. Under the action of the push spring, the front end of the positioning ring pushes the S-tube to a preset position, ensuring accurate punching position. The limiting structure is used to limit the axial movement range of the positioning ring. Specifically, the limiting structure includes a limiting post radially extending on the outer wall of the mandrel and an oblong limiting groove axially extending on the positioning ring. The limiting post slides within the limiting groove.

[0017] In the above-mentioned S-tube punching and flanging mechanism of the four-way valve pipe, the punching mechanism includes a vertically arranged punch, which is mounted on a lifting block through a horizontally extending punch mounting block. The lifting block is vertically and vertically mounted on a first vertical platform through a V-groove structure. The first vertical platform is fixed on a first sliding seat. The lifting block is connected to a lifting driver on the first sliding seat through a connecting rod. The first vertical platform is provided with a slot that allows the connecting rod to pass through. The punch includes a small cylindrical section at the lower end and a large cylindrical section at the upper end, which are connected by a flanged cone.

[0018] The punch is mounted on the first vertical platform of the first sliding seat, and the upper mandrel is also mounted on the first vertical platform, meaning the punch and the upper mandrel can move synchronously, ensuring the correspondence of the first through holes on the punch and the upper mandrel. A vertical sliding connection is achieved between the lifting block and the first vertical platform via a V-groove structure. Specifically, the V-groove structure includes a V-shaped or trapezoidal portion on the back of the lifting block with a cross-section that is larger on the outside and smaller on the inside, and a corresponding groove located on the front side of the first vertical platform. The lifting of the lifting block is driven by a lifting actuator, such as a hydraulic cylinder. The lifting actuator is fixed to the first sliding seat, and its output shaft is connected to the lifting block via a connecting rod. The lifting actuator is located behind the first vertical platform, and the top of the first vertical platform has a downward-extending slot that extends through the thickness direction to accommodate the connecting rod. As an optimization, the connecting rod is inclined, with its lower end hinged to the output shaft of the lifting actuator, and its upper end rotatably embedded in a groove on the back of the lifting block via a cylindrical end.

[0019] As a specific punching component, the punch consists of a small cylindrical section and a large cylindrical section. The small cylindrical section is located at the bottom and has a smaller outer diameter. The two cylindrical sections are connected by a flanged cone. The small cylindrical section is used to punch a pre-hole on the S-tube, while the flanged cone can appropriately enlarge the pre-hole and press it inward to achieve flangeing.

[0020] In the above-mentioned four-way valve pipe S-tube punching and flanging mechanism, the feeding platform includes a feeding base, the top of the feeding base is provided with a feeding groove, and U-shaped anti-reverse blocks are detachably fixed at both ends of the feeding base. The width of the groove of the anti-reverse block is smaller than the outer diameter of the S-tube, and the distance between the two anti-reverse blocks is greater than the length of the S-tube. The material discharge trough has an expansion groove at one end, the inner diameter of which is adapted to the outer diameter of the large end of the S-tube. The top of the material discharge base has a clamping jaw clearance groove perpendicular to the material discharge trough, and the S-tube passes through the clamping jaw clearance groove. The bottom of the feeding base is connected to the output shaft of the demolding lifting cylinder. The cylinder body of the demolding lifting cylinder is fixed on the frame. A support seat is provided on the cylinder body. The feeding base rests against the top of the support seat. The output shaft is connected to the feeding base through a lifting guide block. The lifting guide block passes through the guide block through hole of the support seat.

[0021] The feeding base is used to hold the S-tube. Its top has a feeding groove with an enlarged groove corresponding to the large-diameter section of the S-tube, ensuring a close fit. To accommodate the gripper assembly used for holding and transferring the S-tube, a gripper clearance groove perpendicular to the feeding groove is also provided on the top of the feeding base. Furthermore, vertical anti-reverse blocks are located at both ends of the feeding base. These anti-reverse blocks are U-shaped, with the distance between them slightly greater than the length of the S-tube, ensuring smooth insertion. A downward-facing through-groove is formed on the top of the anti-reverse blocks, allowing the passage of the upper or lower mandrel but not the S-tube. A positioning ring on the lower mandrel, under the action of a push spring, pushes the S-tube to its end to abut against the anti-reverse block. Correspondingly, the front end of the positioning ring is shaped to fit the through-groove, ensuring the positioning ring can pass through the through-groove for smooth engagement with the S-tube.

[0022] In addition, since the punch will also turn inward after punching the S-tube, and this turned-in edge is located in the upper through hole, in order to facilitate the smooth withdrawal of the upper mandrel, the feeding base is set on the machine frame via a demolding lifting cylinder. After punching and turning are completed, the punch retracts, the lower mandrel retracts, and at this time the feeding base can rise to lift the S-tube upward until the turned-in edge leaves the upper through hole, ensuring the smooth withdrawal of the upper mandrel. The cylinder body of the demolding lifting cylinder is fixed on the machine frame, and a support seat is provided on the top of the cylinder body. When demolding is not required, the feeding base is placed on the support seat, which provides upward support force during the punching and turning process. A guide block through hole is provided in the support seat, and the lifting guide block slides in the guide block through hole. The two sections are respectively connected to the output shaft of the feeding base and the demolding lifting cylinder, which have a transmission function.

[0023] Another objective of this invention is to address the aforementioned problems in the existing technology by proposing an S-tube punching and flanging machine for a four-way valve tube.

[0024] To achieve this innovative objective of this utility model, the following technical solutions can be used: A punching and flanging machine for S-tubes of four-way valve pipes includes a frame, on which are provided: The feeding mechanism is used to feed the S-tubes to be processed to the standby position in a head-to-tail manner; The transfer mechanism is used to clamp the S-tube in the standby position and move it to the transfer position; The receiving mechanism is used to receive the S-tube transferred from the transfer station and adjust its axial position. The punching and flanging mechanism is used to receive the S-tube transferred from the receiving mechanism and to punch and flang the corresponding positions. The transfer mechanism is used to clamp the S-tubes on the transfer mechanism, receiving mechanism, and punching and flanging mechanism through multiple sets of gripper assemblies, and to transfer them synchronously to the adjacent downstream mechanisms. A direction detection and adjustment structure is provided between the feeding mechanism and the transfer mechanism to detect the direction of the large and small ends of the S-tube and rotate it 180 degrees as needed to adjust the direction of the large and small ends of the S-tube.

[0025] This utility model discloses a punching and flanging machine for the automated processing of S-tubes. Specifically, it includes feeding, adjusting the direction of the large and small ends, receiving the material and adjusting the axial position, and punching and flanging. The feeding mechanism feeds the S-tubes forward in a head-to-tail manner, with the foremost S-tube in the standby position. The transfer mechanism is used to transfer the S-tubes from the standby position to the transfer position and roughly adjust the axial position to ensure that the gripper assembly of the transfer mechanism can grip them smoothly. The transfer mechanism is used to transfer the S-tubes to the downstream adjacent mechanism. Multiple sets of gripper assemblies are provided, with the spacing adapted to the spacing of the adjacent mechanisms. Since one end of the S-tube has a section with a larger outer diameter and the punching position is not at the center of the length direction, in order to ensure the accuracy of the punching position, a direction detection and adjustment structure is provided between the feeding mechanism and the transfer mechanism. The orientation of the S-tube in the standby position is detected first, and when the orientation of the large and small ends is detected to be opposite to the preset orientation, the S-tube is rotated 180 degrees for adjustment. In addition, a feeding port is provided at equal intervals on the downstream side of the punching and flanging mechanism. The downstreammost set of gripper assemblies can throw the processed S-tube into the feeding port to achieve discharge, thus completing the automated processing of the S-tube.

[0026] In the above-mentioned four-way valve tube S-tube punching and flanging machine, the direction detection and adjustment structure includes a detection component set on the side of the standby position. The detection component is fixed on the frame by a detection frame, and the detection direction points to one end of the S-tube in the standby position. The gripper assembly between the transfer mechanism and the receiving mechanism is connected to the rotary driver and can rotate 180 degrees.

[0027] A detection component is installed on the side of the standby position. This component determines the size of the tube by detecting the distance between itself and the S-tube. It emits a laser beam that illuminates the front end of the S-tube. When this end has a larger outer diameter, the distance is smaller; when it has the other end, the distance is larger. Alternatively, the detection laser can be projected horizontally onto the upper side of the S-tube, higher than the end with the smaller outer diameter but lower than the end with the larger outer diameter. Whether the beam is blocked or not determines the size of the tube. This is existing technology, and the specific method is not limited to this. Furthermore, the first set of gripper assemblies is connected to a rotary driver, enabling a 180-degree horizontal rotation after gripping the S-tube, thus achieving the effect of switching between the large and small ends.

[0028] In the above-mentioned four-way valve pipe S-tube punching and flanging machine, the feeding mechanism includes a hoist, the top of the hoist is provided with a feeding ramp, the lower side of the feeding ramp is connected to a straight U-shaped material channel, the front end of the U-shaped material channel is connected to a cylindrical material channel, the front end of the cylindrical material channel is provided with a receiving section open on the upper side and the left and right sides, the receiving section forms the waiting position, the U-shaped material channel and the cylindrical material channel are respectively connected to the vibration component, and the upstream side of the waiting position is provided with a blocking component for preventing the second S-tube from moving forward.

[0029] The elevator uses several stacked, liftable lifting plates to lift and move the S-tubes from the hopper to the top. The axial direction of the S-tubes is adapted to the length direction of the lifting plates. A backward-sloping discharge ramp is set at the top of the hopper. The lower side of the discharge ramp receives a U-shaped material channel with a U-shaped cross-section. Under the action of the vibration component, the U-shaped material channel transports the S-tubes forward. The cylindrical material channel connects with the U-shaped material channel. The front end of the cylindrical material channel has a receiving section with open upper and left and right sides. The standby position is located on the receiving section. Each S-tube is transported forward by the latter pushing the former. Moreover, a blocking component is set on the upstream side of the standby position to prevent the second S-tube behind from being sent forward, thus preventing the S-tube in the standby position from being knocked down. Of course, the timing of the blocking can be determined by the detection signal of the detection component of the direction detection adjustment structure. Specifically, the blocking assembly includes a blocking base mounted on the frame and located below the cylindrical material channel. A blocking gripper is provided on the top surface of the blocking base. Blocking openings are provided on both sides of the cylindrical material channel at positions corresponding to the blocking gripper. The two grippers of the blocking gripper can clamp the S-tube through the openings to achieve the blocking effect.

[0030] As an optimization, the U-shaped material channel has a return opening on the side near the cylindrical slide. This opening is located on the side of the elevator, and a return slide is provided below it that connects to the bucket of the elevator. The S-tube that moves forward on the U-shaped material channel in a state such as vertical can exit from the opening, pass through the return slide, and return to the bucket to reload, ensuring smooth feeding.

[0031] In the aforementioned four-way valve pipe S-tube punching and flanging machine, the transfer mechanism includes a transfer slide slidably connected to the frame. The transfer slide has two clamping blocks that can be synchronously engaged and disengaged via a clutch synchronous driver. The opposing surfaces of the two clamping blocks are provided with clamping grooves, the height of which is adapted to the height of the standby position. The transfer slide is connected to a transfer slide translation driver on the frame and can move between below the standby position and below the clamping jaw assembly. The transfer slide also has a positioning abutment part located on the side of the clamping block away from the standby position, and its height is adapted to the height of the standby position.

[0032] The transfer slide can move closer to or further away from the standby position along the length of the cylindrical material channel. The transfer slide moves towards the standby position until the abutment part abuts against the S-tube. At this time, two clamping blocks clamp the S-tube from both sides to ensure that it is clamped in the correct position. The opposing surfaces of the two clamping blocks are provided with clamping grooves to ensure stable clamping. After clamping the S-tube, the transfer slide retracts to the transfer position to wait for the gripper assembly to grab it.

[0033] In the aforementioned four-way valve pipe S-tube punching and flanging machine, the receiving mechanism includes a positioning module fixed to the frame via a feeding positioning seat. The positioning module is provided with an S-tube receiving groove. The S-tube receiving groove is provided with abutment and a pusher in two axial directions, respectively. The abutment is fixed to the positioning module. The pusher is set on the positioning module via a pusher driver and can push the S-tube in the S-tube receiving groove toward the abutment. The top of the positioning module is also provided with a gripper clearance groove that intersects perpendicularly with the S-tube receiving groove.

[0034] The positioning module is equipped with an S-tube receiving slot. The transfer mechanism transfers the S-tube from the transfer position into the S-tube receiving slot. The gripper clearance slot is used to make way for the gripper assembly. Fixed abutment and movable pusher are provided at both ends of the S-tube receiving slot. The pusher pushes the S-tube towards the abutment under the action of the pusher driver, ensuring that the subsequent gripper assembly grabs the S-tube in the preset position, and ensuring that the S-tube is accurately placed into the feeding slot of the punching and flanging mechanism.

[0035] In the above-mentioned four-way valve pipe S-tube punching and flanging machine, the transfer mechanism includes a transfer frame erected on the machine frame, a transverse transfer seat slidably connected on the horizontal section of the transfer frame, a jaw mounting plate horizontally arranged on the transverse transfer seat via a jaw lifting driver, a plurality of jaw assemblies provided on the jaw mounting plate, and the transverse transfer seat being driven by the transverse transfer driver on the transfer frame to move back and forth.

[0036] The transfer frame is an inverted U-shape, with a horizontal sliding seat on its top horizontal section. The horizontal sliding seat can move back and forth horizontally. Several sets of horizontally spaced gripper assemblies are set on the horizontal sliding seat through a gripper lifting driver and a gripper mounting plate. The spacing between adjacent gripper assemblies is adapted to the spacing between adjacent S-tubes to be gripped, so as to achieve the effect of synchronously gripping S-tubes and transferring them to adjacent downstream work areas.

[0037] In addition, the actuators used for linear drive in this invention can be cylinders, hydraulic cylinders, motor screw actuators, etc., while the actuators used for rotation can be motors, which is common knowledge.

[0038] Compared with the prior art, the present invention has the following main advantages: 1. In the punching and flanging mechanism of this utility model, the feeding table is provided with a feeding groove, and the S-tube is placed in the feeding groove for processing. The punching mechanism processes the corresponding position of the S-tube through the punch. In order to provide a certain support for the tube wall from the inside during punching and flanging, the frame is also provided with a splicing mandrel mechanism. The upper mandrel and the lower mandrel are inserted from both ends of the S-tube respectively and spliced ​​into a cylindrical mandrel inside the S-tube. The cylindrical mandrel is supported inside the S-tube. The cylindrical mandrel is provided with a through hole that is adapted to the position and extension direction of the punch. The punch punches through the S-tube and extends into the through hole. The upper edge of the through hole can also bend and guide the flanging process to a certain extent.

[0039] 2. The front ends of the upper and lower mandrels are tapered. When the two are joined together, their two inclined cut surfaces are in contact. As they slide closer together, the upper and lower mandrels are pushed outward radially, achieving the effect of the cylindrical mandrel being supported inside the tube.

[0040] 3. The adaptive lifting structure allows the upper and lower mandrels to move within a small range, while remaining stable at a height compatible with the S-tube without external force. This ensures the fit of the two inclined cut surfaces of the upper and lower mandrels, as well as the internal support fit between the mandrel's curved sidewall and the inner wall of the S-tube. Furthermore, the adaptive upward movement of the upper mandrel during ejection on the unloading platform prevents it from breaking off upwards due to the S-tube.

[0041] 4. The adaptive rotation structure allows the lower mandrel to rotate circumferentially, and the adaptive oscillation structure allows the lower mandrel to oscillate adaptively, ensuring smooth docking of the two inclined cut surfaces.

[0042] 5. In order to position the S-tube on the feeding trough axially, a positioning ring is fitted on the front end of the lower mandrel. Under the action of the push spring, the front end of the positioning ring pushes the S-tube to the preset position to ensure accurate punching position.

[0043] 6. The feeding base is used to specifically hold the S-tube. It has a feeding groove at the top and vertical anti-reverse blocks at both ends of the feeding base. The anti-reverse blocks are U-shaped and the distance between the two anti-reverse blocks is slightly greater than the length of the S-tube to ensure that the S-tube is smoothly inserted. The top of the anti-reverse block has a downward groove that allows the upper or lower mandrel to pass through, but does not allow the S-tube to pass through. The positioning ring can push the S-tube to the end and abut against the anti-reverse block under the action of the push spring.

[0044] 7. To ensure the smooth withdrawal of the upper mandrel, the feeding base is set on the frame via a demolding lifting cylinder. After punching and flanging are completed, the punch retracts and the lower mandrel retracts. At this time, the feeding base can rise to lift the S-tube upwards until the flanged part leaves the upper through hole, ensuring the smooth withdrawal of the upper mandrel.

[0045] 8. The punching and flanging machine of this utility model is used for the automated processing of S-tubes. Specifically, it includes feeding, adjusting the direction of the large and small ends, receiving the material and adjusting the axial position, and punching and flanging. The feeding mechanism feeds the S-tubes forward in a head-to-tail manner, with the foremost S-tube located in the standby position. The transfer mechanism is used to transfer the S-tubes in the standby position to the transfer position and roughly adjust the axial position to ensure that the gripper assembly of the transfer mechanism can smoothly grasp them. The transfer mechanism is used to transfer the S-tubes to the downstream adjacent mechanism.

[0046] 9. To ensure the accuracy of the punching position, a direction detection and adjustment structure is provided between the feeding mechanism and the transfer mechanism. First, the orientation of the S-tube in the standby position is detected, and when the orientation of the large and small ends is detected to be opposite to the preset, the S-tube is rotated 180 degrees for adjustment. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the overall structure of the S-tube punching and flanging machine for the four-way valve tube provided by this utility model; Figure 2 This is a schematic diagram of the feeding mechanism and the transfer mechanism provided by this utility model; Figure 3 yes Figure 2 Enlarged detail view of point A in the middle; Figure 4 This is a schematic diagram of the material receiving mechanism provided by this utility model; Figure 5 This is a schematic diagram of the punching and flanging mechanism provided by this utility model; Figure 6 yes Figure 5 Enlarged detail view of point B in the middle; Figure 7 This is a cross-sectional schematic diagram of the material feeding platform provided by this utility model; Figure 8 This is a schematic diagram of the assembled mandrel mechanism provided by this utility model; Figure 9 This is a schematic diagram of the structure of the lower core rod and the annular pressure cap provided by this utility model; Figure 10 This is a schematic diagram of the arrangement of the transfer mechanism provided by this utility model; Figure 11 This is a schematic diagram of the structure of the S-tube provided by this utility model.

[0048] In the diagram, 1 is the frame, 2 is the feeding platform, 3 is the feeding trough, 4 is the punching mechanism, 5 is the punch, 6 is the S-tube, 7 is the assembled mandrel mechanism, 8 is the upper mandrel, 9 is the lower mandrel, 10 is the cylindrical mandrel, 12 is the inclined section, 13 is the upper through hole, 14 is the lower through hole, 15 is the first sliding seat, 16 is the second sliding seat, 17 is the first vertical platform, 18 is the second vertical platform, 19 is the translation driver, 20 is the upper mandrel mounting block, 21 is the lower mandrel mounting block, 22 is the adaptive lifting structure, 23 is the positioning spring, 24 is the screw, 25 is the screw adjustment seat, 27 is the screw groove, 28 is the large head, and 29 is the adaptive rotation structure. 30. Adaptive swing structure; 31. Bearing groove; 32. Bearing assembly; 33. Handle; 34. Annular cap; 35. Inner hole; 36. Outer limiting surface; 37. Inner limiting surface; 38. Rod body; 39. Tenon; 40. Groove; 41. Circular part; 42. Connecting section; 43. Positioning ring; 46. Limiting structure; 47. Push spring; 48. Punch mounting block; 49. Lifting block; 50. V-groove structure; 51. Lifting driver; 52. Connecting rod; 53. Slot; 54. Small cylindrical section; 55. Large cylindrical section; 56. Flanged cone; 57. Discharge base; 58. Anti-reverse block; 59. 60. Through slot; 61. Expanded slot; 62. Large end; 63. Clamping jaw clearance slot; 64. Demolding lifting cylinder; 66. Support base; 68. Lifting guide block; 69. Guide block through hole; 70. Feeding mechanism; 71. Standby position; 72. Transfer mechanism; 73. Transfer position; 74. Receiving mechanism; 75. Punching and flanging mechanism; 76. Transfer mechanism; 77. Clamping jaw assembly; 78. Direction detection and adjustment structure; 79. Detection assembly; 80. Detection frame; 81. Rotary drive; 82. Elevator; 83. Unloading ramp; 84. U-shaped material channel; 85. Cylindrical material channel; 86. Material receiving section; 87. Vibration assembly. 7. Blocking assembly 88. Transfer slide 89. Clutch synchronous driver 90. Clamping block 91. Clamping groove 92. Positioning abutment 93. Loading positioning seat 94. Positioning module 95. S-tube accommodating groove 96. Abutment 97. Pushing component 98. Pushing driver 99. Unloading port 100. Transfer frame 101. Horizontal section 102. Horizontal moving seat 103. Horizontal moving driver 105. Gripper mounting plate 106. Gripper lifting driver 107. Transfer slide translation driver 108. Blocking gripper 109. Blocking opening 110. Return opening 111. Detailed Implementation

[0049] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0050] Specific implementation examples Figures 1-11 As shown, an S-tube punching and flanging machine for a four-way valve tube includes a frame 1, on which: The feeding mechanism 70 is used to feed the S-tube 6 to be processed to the standby position 71 in a head-to-tail manner; Transfer mechanism 72 is used to clamp the S-tube 6 of the standby position 71 and move it to the transfer position 73; The receiving mechanism 74 is used to receive the S-tube 6 transferred from the intermediate position 73 and adjust its axial position; The punching and flanging mechanism 75 is used to receive the S-tube 6 transferred from the receiving mechanism 74 and to perform punching and flanging treatment on the corresponding positions. The transfer mechanism 76 is used to clamp the S-tube 6 on the transfer mechanism 72, the receiving mechanism 74, and the punching and flanging mechanism 75 through multiple sets of gripper assemblies 77, and to transfer it synchronously to the adjacent downstream mechanism. A direction detection and adjustment structure 78 is provided between the feeding mechanism 70 and the transfer mechanism 72, which is used to detect the direction of the large and small ends of the S-tube 6 and rotate it 180 degrees in time to adjust the direction of the large and small ends of the S-tube 6.

[0051] Specifically, this punching and flanging machine is used for the automated processing of S-tubes 6. The process includes feeding, adjusting the orientation of the large and small ends, receiving the material and adjusting its axial position, and punching and flanging. The feeding mechanism 70 feeds the S-tubes 6 forward in a head-to-tail configuration, with the foremost S-tube 6 located at the standby position 71. The transfer mechanism 72 transfers the S-tubes 6 from the standby position 71 to the transfer position 73 and roughly adjusts their axial position to ensure smooth gripping by the gripper assembly 77 of the transfer mechanism 76. The transfer mechanism 76 transfers the S-tubes 6 downstream to adjacent mechanisms. Multiple gripper assemblies 77 are provided, with spacing adapted to the spacing of adjacent mechanisms. Since one end of the S-tube 6 has a larger outer diameter section, and the punching position is not at the center of its length, a direction detection and adjustment structure 78 is provided between the feeding mechanism 70 and the transfer mechanism 72 to ensure accurate punching position. This structure first detects the orientation of the S-tube 6 at the standby position 71, and when the orientation of the large and small ends is detected to be opposite to the preset orientation, the S-tube 6 is rotated 180 degrees for adjustment. In addition, a discharge port 100 is provided at equal intervals on the downstream side of the punching and flanging mechanism 75. The downstream set of gripper assemblies 77 can throw the processed S-tube 6 into the discharge port 100 to achieve discharge, thus completing the automated processing of the S-tube 6.

[0052] like Figure 1 , 2 As shown in Figures 3 and 10, the direction detection and adjustment structure 78 includes a detection component 79 disposed on the side of the standby position 71. The detection component 79 is fixed to the frame 1 by the detection frame 80, and the detection direction points to one end of the S-tube 6 on the standby position 71. The gripper assembly 77 between the transfer mechanism 72 and the receiving mechanism 74 is connected to the rotary driver 81 and can rotate 180 degrees.

[0053] Specifically, a detection component 79 is provided on the side of the standby position 71 to realize the judgment of the large and small ends. In addition, the first set of gripper components 77 is connected to the rotary driver 81, which can perform a 180-degree horizontal rotation after clamping the S tube 6, thereby realizing the effect of swapping the large and small ends.

[0054] like Figure 1 ,2 As shown in Figure 3, the feeding mechanism 70 includes a hoist 82. The top of the hoist 82 is provided with a discharge ramp 83. A straight U-shaped material channel 84 is connected to the lower side of the discharge ramp 83. The front end of the U-shaped material channel 84 is connected to a cylindrical material channel 85. The front end of the cylindrical material channel 85 is provided with a receiving section 86 that is open on the upper and left and right sides. A waiting position 71 is formed on the receiving section 86. The U-shaped material channel 84 and the cylindrical material channel 85 are respectively connected to the vibration assembly 87. A blocking assembly 88 for preventing the second S-tube 6 from moving forward is provided on the upstream side of the waiting position 71. The blocking assembly 88 includes a blocking base set on the frame 1 and located below the cylindrical material channel 85. A blocking claw 109 is provided on the top surface of the blocking base. Blocking openings 110 are provided on both sides of the cylindrical material channel 85 at positions corresponding to the blocking claw 109. The two claws of the blocking claw 109 can pass through the blocking openings 110 to clamp the S-tube 6 to achieve the blocking effect.

[0055] Specifically, the elevator 82 uses several stacked, liftable lifting plates to lift and move the S-tube 6 from the hopper to the top. The axial direction of the S-tube 6 is adapted to the length direction of the lifting plates. A backward-sloping discharge ramp 83 is provided at the top of the hopper. The lower side of the discharge ramp 83 receives a U-shaped material channel 84 with a U-shaped cross-section. The U-shaped material channel 84 transports the S-tube 6 forward under the action of the vibration component 87. A cylindrical material channel 85 connects with the U-shaped material channel 84. The front end of the cylindrical material channel 85 is provided with a receiving section 86 that is open on the upper and left and right sides. The standby position 71 is located on the receiving section 86. Each S-tube 6 is transported forward by the latter pushing the former. Moreover, a blocking component 88 is provided on the upstream side of the standby position 71 to block the second S-tube 6 from being sent forward, so as to prevent the S-tube 6 on the standby position 71 from being knocked down. Of course, the timing of blocking can be determined by the detection signal of the detection component 79 of the direction detection adjustment structure 78.

[0056] Furthermore, the U-shaped material channel 84 has a return opening 111 on the side near one end of the cylindrical slide. This opening is located on the side of the elevator 82, and a return slide 112 connected to the hopper of the elevator 82 is provided below it. The S-tube 6 that moves forward on the U-shaped material channel 84 in a state such as vertical can exit from the return opening 111, pass through the return slide 112 and return to the hopper to reload, ensuring smooth feeding.

[0057] like Figure 2 , 3As shown, the transfer mechanism 72 includes a transfer slide 89 slidably connected to the frame 1. The transfer slide 89 is provided with two clamping blocks 91 that can be synchronously engaged and disengaged via a clutch synchronous driver 90. The opposing surfaces of the two clamping blocks 91 are provided with clamping grooves 92. The height of the two clamping grooves 92 is adapted to the height of the standby position 71. The transfer slide 89 is connected to the transfer slide translation driver 108 on the frame 1 and can move between the standby position 71 and the gripper assembly 77. The transfer slide 89 is also provided with a positioning abutment part 93. The positioning abutment part 93 is located on the side of the clamping block 91 away from the standby position 71, and its height is adapted to the height of the standby position 71. The receiving mechanism 74 includes a positioning module 95 fixed to the frame 1 via a feeding positioning seat 94. The positioning module 95 is provided with an S-tube receiving groove 96. The S-tube receiving groove 96 is provided with an abutment 97 and a pusher 98 in two axial directions respectively. The abutment 97 is fixed to the positioning module 95. The pusher 98 is set on the positioning module 95 via a pusher driver 99 and can push the S-tube 6 on the S-tube receiving groove 96 toward the abutment 97. The top of the positioning module 95 is also provided with a gripper clearance groove 63 that intersects perpendicularly with the S-tube receiving groove 96.

[0058] Specifically, the transfer slide 89 can move closer to or further away from the standby position 71 along the length of the cylindrical material channel 85. The transfer slide 89 moves towards the standby position 71 until the positioning abutment part 93 abuts against the S-tube 6. At this time, the two clamping blocks 91 clamp the S-tube 6 from both sides to ensure that it is clamped in the correct position. The opposing surfaces of the two clamping blocks 91 are provided with clamping grooves 92 to ensure stable clamping. After clamping the S-tube 6, the transfer slide 89 retracts to the transfer position 73 to wait for the gripper assembly 77 to grab it. The positioning module 95 is provided with an S-tube receiving groove 96. The transfer mechanism 76 transfers the S-tube 6 on the transfer position 73 into the S-tube receiving groove 96. The gripper clearance groove 63 is used to make way for the gripper assembly 77. Fixed abutment members 97 and movable push members 98 are provided at both ends of the S-tube receiving groove 96. Under the action of the push driver 99, the push member 98 pushes the S-tube 6 towards the abutment member 97 to ensure that the gripper assembly 77 grips the S-tube 6 in the preset position and ensures that the S-tube 6 is accurately placed into the material discharge groove 3 of the punching and flanging mechanism 75.

[0059] like Figure 1 , 10 As shown, the transfer mechanism 76 includes a transfer frame 101 erected on the frame 1. A transverse transfer seat 103 is slidably connected to the horizontal section 102 of the transfer frame 101. A gripper mounting plate 106 is horizontally arranged on the transverse transfer seat 103 via a gripper lifting driver 107. A plurality of gripper assemblies 77 are provided on the gripper mounting plate 106. The transverse transfer seat 103 is driven by the transverse transfer driver 105 on the transfer frame 101 to reciprocate.

[0060] Specifically, the transfer frame 101 is an inverted U-shape, and a transverse shift seat 103 is provided on its top horizontal section 102. The transverse shift seat 103 can move horizontally back and forth. Several sets of horizontally spaced gripper assemblies 77 are provided on the transverse shift seat 103 through the gripper lifting driver 107 and the gripper mounting plate 106. The spacing between adjacent gripper assemblies 77 is adapted to the spacing between adjacent S-tubes 6 to be gripped, so as to achieve the effect of synchronously gripping the S-tubes 6 and transferring them to the adjacent downstream workpiece.

[0061] like Figure 1 as well as Figures 5-9 As shown, the S-tube punching and flanging mechanism for the four-way valve pipe is mounted on the frame 1, and includes: The feeding platform 2 is equipped with a feeding trough 3 for placing the S-tube 6 to be processed; The punching mechanism 4 can move the punch 5 above the feeding trough 3 and perform punching and flanging processing on the S-tube 6. The assembled mandrel mechanism 7 includes an upper mandrel 8 and a lower mandrel 9 located in the two axial directions of the S-tube 6 and capable of being inserted into the S-tube 6. The upper mandrel 8 and the lower mandrel 9 are assembled into a cylindrical mandrel 10. The cylindrical mandrel 10 is provided with a through hole corresponding to the punching direction of the punch 5.

[0062] Specifically, this punching and flanging mechanism is used to punch and flanging the S-tube 6 of a four-way valve pipe. The S-tube 6 is a straight pipe, with one end being a large-diameter end 62. In this mechanism, the feeding table 2 provides a feeding trough 3, in which the S-tube 6 is placed for processing. The punching mechanism 4 processes the corresponding position of the S-tube 6 through the punch 5. In order to provide some support to the pipe wall from the inside during punching and flanging, the frame 1 is also equipped with a splicing mandrel mechanism 7. The upper mandrel 8 and the lower mandrel 9 are inserted from both ends of the S-tube 6 respectively, and are spliced ​​into a roughly cylindrical mandrel 10 inside the S-tube 6. The cylindrical mandrel 10 is supported inside the S-tube 6. The cylindrical mandrel 10 is provided with a through hole that is adapted to the position and extension direction of the punch 5. The punch 5 punches through the S-tube 6 and extends into the through hole. The upper edge of the through hole can also bend and guide the flanging process to a certain extent.

[0063] like Figure 7-9 As shown, the upper mandrel 8 and the lower mandrel 9 have parallel inclined cut surfaces 12 on opposite sides of their front ends. The upper mandrel 8 has a vertically penetrating upper through hole 13, and the lower mandrel 9 has a vertically penetrating lower through hole 14. The upper through hole 13 is a circular hole, and its axial cross-section is T-shaped with a larger upper section and a smaller lower section. The lower through hole 14 is a waist-shaped hole, and its length direction is adapted to the axial direction of the lower mandrel 9. When the upper mandrel 8 and the lower mandrel 9 are joined together, the two inclined cut surfaces 12 are in contact with each other, and the orthographic projection of the upper through hole 13 is located inside the lower through hole 14.

[0064] Specifically, the axial directions of the upper mandrel 8 and the lower mandrel 9 coincide with the horizontal plane, and the inclined cut surface 12 is inclined relative to the horizontal plane, that is, the front ends of the upper mandrel 8 and the lower mandrel 9 are conical. When the two are joined together, the two inclined cut surfaces 12 are in contact. As they slide closer together, the upper mandrel 8 and the lower mandrel 9 are pushed radially outward, achieving the effect of the cylindrical mandrel 10 being supported inside the tube. Of course, in order to guide the insertion of the S-tube 6, a chamfer is provided at the front end of both the upper mandrel 8 and the lower mandrel 9. In terms of the through hole, the upper through hole 13 of the upper mandrel 8 is circular and adapted to the size and position of the punch 5, while the lower through hole 14 of the lower mandrel 9 is waist-shaped. The length direction of this waist hole is adapted to the extension and retraction direction of the lower mandrel 9, ensuring that the upper through hole 13 can pass downward. Moreover, the upper through hole 13 is T-shaped and consists of two sections with different inner diameters. The upper section has a larger inner diameter, and the annular step between the two sections can position the flange.

[0065] like Figure 8 , 9 As shown, the assembled mandrel mechanism 7 includes a first sliding seat 15 and a second sliding seat 16 slidably connected to the frame 1. An upper mandrel 8 is mounted on the first sliding seat 15 via a first vertical platform 17, and a lower mandrel 9 is mounted on the second sliding seat 16 via a second vertical platform 18. The upper mandrel 8, lower mandrel 9, and the feeding trough 3 are arranged coaxially. The first sliding seat 15 and the second sliding seat 16 are located at opposite ends of the feeding platform 2 and can engage and disengage relative to the feeding platform 2 under the action of the translational actuator 19. The side of the first vertical platform 17… An upper mandrel mounting block 20 capable of vertical lifting is slidably connected to the upper mandrel mounting block 20. The rear end of the upper mandrel 8 is fixed to the upper mandrel mounting block 20. A lower mandrel mounting block 21 capable of vertical lifting is slidably connected to the side of the second vertical platform 18. The rear end of the lower mandrel 9 is fixed to the lower mandrel mounting block 21. An adaptive lifting structure 22 is provided between the upper mandrel mounting block 20 and the first vertical platform 17, and between the lower mandrel mounting block 21 and the second vertical platform 18, which can keep the upper mandrel 8 or the lower mandrel 9 at a predetermined height and can adaptively lift and lower. The adaptive lifting structure 22 includes a positioning spring 23, which is sleeved on a screw 24. The first vertical platform 17 and the second vertical platform 18 are detachably provided with screw adjustment seats 25 on their sides. The bottom of the upper mandrel mounting block 20 and the lower mandrel mounting block 21 are provided with screw holes. The screw adjustment seat 25 is provided with a vertically penetrating screw groove 27. The screw 24 passes through the screw groove 27 upward. The large head 28 is limited to the bottom of the screw adjustment seat 25. The front end of the screw engages with the screw hole. The two ends of the positioning spring 23 abut against the screw adjustment seat 25 and the upper mandrel mounting block 20 or the lower mandrel mounting block 21, respectively.

[0066] Specifically, the first sliding seat 15 and the second sliding seat 16 both slide on the frame 1 and are distributed in two axial directions of the S-tube 6. Both can be driven by a translation driver 19, such as a cylinder. The first sliding seat 15 is provided with a first vertical platform 17, and an upper mandrel mounting block 20 is slidably connected to the first vertical platform 17. The upper mandrel 8 is fixed on the upper mandrel mounting block 20. The adaptive lifting structure 22 enables the upper mandrel 8 to have a small range of lifting capability, but it can be stabilized at a height adapted to the S-tube 6 when no external force is applied. The lower mandrel 9 is similarly provided on the second sliding seat 16. This ensures that when the upper mandrel 8 and the lower mandrel 9 are joined together, especially when the two inclined cut surfaces 12 are joined and slide relative to each other, the upper mandrel 8 and the lower mandrel 9 can maintain a horizontal state and rise and fall appropriately, ensuring the fit of the two inclined cut surfaces 12, and also ensuring the inner support fit of the arc-shaped sidewall of the mandrel with the inner wall of the S-tube 6. The adaptive lifting structures 22 of the upper mandrel mounting base 20 and the lower mandrel mounting base 21 are basically similar. Here, the adaptive lifting structure 22 of the upper mandrel mounting base 20 will be described. The positioning spring 23 is sleeved on the screw shank of the screw 24. The screw 24 is screwed vertically upward at the bottom of the upper mandrel mounting base 20. A screw adjusting seat 25 located below the upper mandrel mounting base 20 is detachably provided on the side of the first vertical platform 17. The screw passes through the screw groove 27 of the screw adjusting seat 25. The outer diameter of the large head 28 is larger than the width of the screw groove 27 of the screw adjusting seat 25. The positioning spring 23 provides an upward elastic force to the upper mandrel mounting base 20. Furthermore, the large head 28 of the screw 24 on the upper mandrel mounting base 20 is in a certain gap with the bottom surface of the screw adjusting base 25, while the large head 28 of the screw 24 on the lower mandrel mounting base 21 is in contact with the bottom surface of the screw adjusting base 25. That is, the upper mandrel mounting base 20 has a certain self-adaptive rising ability, which ensures the smooth docking of the upper mandrel 8 and the lower mandrel 9. In addition, since the S-tube 6 will turn inward after punching, in order to facilitate the smooth withdrawal of the upper mandrel 8, this mechanism is also equipped with a corresponding mold release structure, which can push the S-tube 6 upward so that the turned-out edge leaves the upper through hole 13. During the upward pushing process, the upper mandrel 8 can rise adaptively, which also prevents it from being broken upward by the S-tube 6.

[0067] As an optimization of this embodiment, an adaptive rotation structure 30 and an adaptive swing structure 31 are provided between the lower mandrel 9 and the lower mandrel mounting block 21; the adaptive rotation structure 30 includes a bearing groove 32 opened on the front side of the lower mandrel mounting block 21, and a bearing assembly 33 locked in the bearing groove 32. The handle 34 of the lower mandrel 9 is fixedly connected to the inner ring of the bearing assembly 33. An annular pressure cap 35 is detachably provided on the outer side of the bearing groove 32. An axially extending inner limiting surface 38 is provided on the wall of the inner hole 36 of the annular pressure cap 35, and an axially extending outer limiting surface 37 is provided on the outer side wall of the handle 34. The handle 34 passes through the inner hole 36. The inner limiting surface 38 and the outer limiting surface 37 are opposite to each other, and there is a rotation gap between them that allows the handle 34 to rotate within a certain range; the adaptive swing structure 31 includes The rod body 39 and the handle 34 are respectively provided with a tenon 40 and a groove 41 at the rear end and the front end of the handle 34 of the lower core rod 9, respectively. The tenon 40 includes a circular part 42 and a connecting section 43 connecting the circular part 42 and the rod body 39. The groove 41 is adapted to the shape of the tenon 40 and extends in the horizontal direction. The tenon 40 is embedded in the groove 41. There are swing gaps between the rear end face of the rod body 39 and the front end face of the handle 34, and between the connecting section 43 and the groove 41, which allow the rod body 39 to swing and rotate within a certain range. A positioning ring 46 is sleeved on the front end of the rod body 39. A limiting structure 47 for limiting the axial movement range of the positioning ring 46 is provided between the positioning ring 46 and the rod body 39. A push spring 48 is provided between the positioning ring 46 and the annular pressure cap 35. The front end of the positioning ring 46 abuts against the end face of the S-tube 6.

[0068] Specifically, the adaptive rotation structure 30 allows the lower mandrel 9 to rotate circumferentially, and the adaptive swing structure 31 allows the lower mandrel 9 to swing adaptively, ensuring smooth docking of the two inclined cut surfaces 12. Specifically, regarding the adaptive rotation, the bearing assembly 33 uses a deep groove ball bearing, with its outer ring secured in the bearing groove 32 on the front side of the lower mandrel mounting block 21. The handle 34 of the lower mandrel 9 is fixed in the inner ring, enabling the lower mandrel 9 to rotate. The outer side of the bearing groove 32 is sealed by an annular cap 35 to prevent the bearing assembly 33 from coming off. To limit the rotation of the lower mandrel 9 to a small range, corresponding inner limiting surfaces 38 and outer limiting surfaces 37 are provided on the inner hole 36 of the annular cap 35 and the outer wall of the handle 34. However, the inner limiting surfaces 38 and outer limiting surfaces 37 are not completely in contact; there is a certain gap between them, allowing the handle 34 to rotate within a small range. Regarding the adaptive oscillation, the rod body 39 and handle 34 of the lower mandrel 9 are detachably connected by a tenon 40 and a groove 41. The tenon 40 has a thinner connecting section 43 and a larger circular part 42. The groove 41 has a complementary shape, but the connecting section 43 is slightly thinner than the corresponding position on the groove 41, allowing the connecting section 43 to move up and down to a certain extent. The circular part 42 rotates exactly within the groove 41, thus realizing the up and down oscillation of the lower mandrel 9, with a small oscillation range. Furthermore, in order to position the axial position of the S-tube 6 on the discharge trough 3, a positioning ring 46 is fitted at the front end of the lower mandrel 9. Under the action of the push spring 48, the front end of the positioning ring 46 pushes the S-tube 6 to the preset position, ensuring accurate punching position. The limiting structure 47 is used to limit the axial movement range of the positioning ring 46. Specifically, the limiting structure 47 includes a limiting post that extends radially on the outer wall of the rod 39 and a waist-shaped limiting groove that extends axially on the positioning ring 46. The limiting post slides in the limiting groove.

[0069] like Figure 5 , 6 As shown, the punching mechanism 4 includes a vertically arranged punch 5, which is mounted on a lifting block 50 via a laterally extending punch mounting block 49. The lifting block 50 is vertically and vertically mounted on a first vertical platform 17 via a V-groove structure 51. The first vertical platform 17 is fixed to a first sliding seat 15. The lifting block 50 is connected to the lifting driver 52 on the first sliding seat 15 via a connecting rod 53. The first vertical platform 17 is provided with a slot 54 that allows the connecting rod 53 to pass through. The punch 5 includes a small cylindrical section 55 at the lower end and a large cylindrical section 56 at the upper end. The small cylindrical section 55 and the large cylindrical section 56 are connected by a flanged cone portion 57.

[0070] Specifically, the punch 5 is mounted on the first vertical platform 17 of the first sliding seat 15, and the upper mandrel 8 is also mounted on the first vertical platform 17, meaning that the punch 5 and the upper mandrel 8 can move synchronously, ensuring the correspondence of the first through holes 13 on the punch 5 and the upper mandrel 8. The lifting block 50 and the first vertical platform 17 are vertically slidably connected via a V-groove structure 51. Specifically, the V-groove structure 51 includes a V-shaped or trapezoidal portion on the back of the lifting block 50 with a cross-section that is larger on the outside and smaller on the inside, and a corresponding groove located on the front side of the first vertical platform 17. The lifting of the lifting block 50 is driven by a lifting actuator 52, such as a hydraulic cylinder. The lifting actuator 52 is fixed to the first sliding seat 15, and its output shaft is connected to the lifting block 50 via a connecting rod 53. The lifting actuator 52 is located behind the first vertical platform 17. The top of the first vertical platform 17 has a downward-extending slot 54 that extends through the thickness direction to allow space for the connecting rod 53. As an optimization, the connecting rod 53 is in an inclined state, with its lower end hinged to the output shaft of the lifting drive 52, and its higher end rotatably embedded in a groove on the back of the lifting block 50 through its cylindrical end. The punch 5 consists of a small cylindrical section 55 and a large cylindrical section 56, with the small cylindrical section 55 located at the bottom and having a smaller outer diameter. The two cylindrical sections are connected by a flanged cone 57. The small cylindrical section 55 is used to punch a pre-hole in the S-tube 6, and the flanged cone 57 can appropriately enlarge the pre-hole and press it inward to achieve flangeing.

[0071] like Figure 5 , 6 As shown in Figure 7, the feeding platform 2 includes a feeding base 58, a feeding groove 3 on the top of the feeding base 58, and U-shaped anti-reverse blocks 59 detachably fixed at both ends of the feeding base 58. The width of the through groove 60 of the anti-reverse block 59 is smaller than the outer diameter of the S-tube 6, and the distance between the two anti-reverse blocks 59 is greater than the length of the S-tube 6. One end of the feeding groove 3 is provided with an expansion groove 61, the inner diameter of which is adapted to the outer diameter of the large end 62 of the S-tube 6. The top of the feeding base 58 is provided with a claw clearance groove 63 perpendicular to the feeding groove 3, and the S-tube 6 passes through the claw clearance groove 63. The bottom of the feeding base 58 is connected to the output shaft of the demolding lifting cylinder 64. The cylinder body of the demolding lifting cylinder 64 is fixed on the frame 1, and a support seat 66 is provided on the cylinder body. The feeding base 58 rests against the top of the support seat 66. The output shaft is connected to the feeding base 58 through a lifting guide block 68, and the lifting guide block 68 passes through the guide block through hole 69 of the support seat 66.

[0072] Specifically, the feeding base 58 is used to hold the S-tube 6. It has a feeding groove 3 on its top. The feeding groove 3 has an expansion groove 61 at the position corresponding to the large diameter section of the S-tube 6 to ensure that the S-tube 6 is placed in a close fit. In order to make way for the gripper assembly 77 used to clamp and transfer the S-tube 6, a gripper clearance groove 63 perpendicular to the feeding groove 3 is also provided on the top of the feeding base 58. In addition, vertical anti-reverse blocks 59 are provided at both ends of the feeding base 58. The anti-reverse blocks 59 are U-shaped, and the distance between the two anti-reverse blocks 59 is slightly larger than the length of the S-tube 6 to ensure that the S-tube 6 is smoothly inserted. The top of the anti-reverse block 59 has a downward groove 60. The groove 60 allows the upper mandrel 8 or the lower mandrel 9 to pass through, but does not allow the S-tube 6 to pass through. The positioning ring 46 on the lower mandrel 9 can push the S-tube 6 to the end and abut against the anti-reverse block 59 under the action of the push spring 48. Correspondingly, the front end of the positioning ring 46 is set to a shape that adapts to the groove 60 to ensure that the positioning ring 46 can pass through the groove 60 to smoothly push and cooperate with the S-tube 6. In addition, since the punch 5 will also turn inward after punching the S-tube 6, and this turned-in edge is located in the upper through hole 13, in order to facilitate the smooth withdrawal of the upper mandrel 8, the feeding base 58 is set on the frame 1 through the demolding lifting cylinder 64. After the punching and turning are completed, the punch 5 withdraws and the lower mandrel 9 withdraws. At this time, the feeding base 58 can rise and lift the S-tube 6 upward until the turned-in edge leaves the upper through hole 13, ensuring the smooth withdrawal of the upper mandrel 8. The cylinder body of the demolding lifting cylinder 64 is fixed on the frame 1, and a support seat 66 is provided on the top of the cylinder body. When demolding is not required, the feeding base 58 is placed on the support seat 66. The support seat 66 provides upward support force during the punching and turning process. A guide block through hole 69 is provided in the support seat 66. The lifting guide block 68 slides in the guide block through hole 69. The two sections are respectively connected to the output shaft of the feeding base 58 and the demolding lifting cylinder 64, and have a transmission function.

[0073] The specific working principle is as follows: The S-tube 6 to be processed is placed in the hopper of the elevator 82. The elevator 82 lifts the S-tube 6 upward. The S-tube 6 falls into the U-shaped material channel 84 through the discharge slope 83. The U-shaped material channel 84 moves the S-tube 6 forward in a head-to-tail arrangement through the vibration component 87. The S-tube 6 enters the cylindrical material channel 85. The S-tube 6 at the front enters the standby position 71. The second S-tube 6 is clamped and blocked by the blocking claw 109. The detection component 79 detects the direction of the large and small ends of the S-tube 6 in the standby position 71 and sends the information to the control center.

[0074] Then, the transfer slide 89 moves forward until the abutment part 93 abuts against the front end of the S-tube 6. After that, the two clamping blocks 91 close, clamping the S-tube 6 and retracting to the transfer position 73. The first set of gripper assembly 77 clamps the S-tube 6. When the control center determines that the large and small ends are facing opposite directions, the gripper assembly 77 rotates 180 degrees; otherwise, it does not rotate. The gripper assembly 77 moves the S-tube 6 into the S-tube receiving slot 96 of the positioning module 95.

[0075] Then, the pusher 98 pushes forward, pushing the S-tube 6 to the rear end to abut against the abutment 97, and the second set of gripper assemblies 77 clamps the S-tube 6 and transfers it to the unloading table 2.

[0076] Then, the first sliding seat 15 and the second sliding seat 16 move forward, the upper core rod 8 and the lower core rod 9 are inserted into the S tube 6, the two inclined cut surfaces 12 are in contact, the front ends of the upper core rod 8 and the lower core rod 9 are joined together inside the tube and internally supported inside the S tube 6.

[0077] Afterwards, the punch 5 moves vertically downwards, and the small cylindrical section 55 of the punch 5 punches a hole at the corresponding position on the S-tube 6. The upper flanged cone 57 flanges the punched hole inwards. After the flange is completed, the punch 5 rises and resets.

[0078] Afterwards, the lower mandrel 9 retracts to its original position, the demolding lifting cylinder 64 lifts the feeding base 58 upwards, the S-tube 6 rises, and the flange leaves the upper through hole 13. Then the upper mandrel 8 retracts to its original position, the feeding base 58 descends to reset, and the last set of gripper assemblies 77 clamps the S-tube 6 and moves it to the discharge port to discharge the processed S-tube 6.

[0079] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A punching and flanging mechanism for an S-tube of a four-way valve pipe, mounted on a frame (1), characterized in that, include: The feeding platform (2) is provided with a feeding trough (3) for placing the S-tube to be processed. The punching mechanism (4) can move the punch (5) above the feeding trough (3) and perform punching and flanging processing on the S-tube (6); The assembled mandrel mechanism (7) includes an upper mandrel (8) and a lower mandrel (9) located in the two axial directions of the S-tube (6) and capable of being inserted into the S-tube (6). The upper mandrel (8) and the lower mandrel (9) are assembled into a cylindrical mandrel (10). The cylindrical mandrel (10) is provided with a through hole corresponding to the punching direction of the punch (5).

2. The S-tube punching and flanging mechanism for the four-way valve pipe according to claim 1, characterized in that, The upper core rod (8) and the lower core rod (9) have parallel inclined cut surfaces (12) on opposite sides of their front ends. The upper core rod (8) has a vertical through hole (13), and the lower core rod (9) has a vertical through hole (14). The upper through hole (13) is a round hole, and the axial cross section is T-shaped with a larger upper section and a smaller lower section; The lower through hole (14) is a waist hole, and its length direction is adapted to the axial direction of the lower core rod (9); When the upper core rod (8) and the lower core rod (9) are joined together, the two inclined cut surfaces (12) are in contact with each other, and the orthographic projection of the upper through hole (13) is located in the lower through hole (14).

3. The S-tube punching and flanging mechanism for the four-way valve pipe according to claim 1, characterized in that, The assembled mandrel mechanism (7) includes a first sliding seat (15) and a second sliding seat (16) slidably connected to the frame (1). An upper mandrel (8) is provided on the first sliding seat (15) via a first vertical platform (17), and a lower mandrel (9) is provided on the second sliding seat (16) via a second vertical platform (18). The upper mandrel (8), the lower mandrel (9), and the feeding trough (3) are arranged coaxially. The first sliding seat (15) and the second sliding seat (16) are located at both ends of the feeding platform (2) and can move relative to the feeding platform (2) under the action of the translation driver (19). The first vertical platform (17) is slidably connected to an upper mandrel mounting block (20) that can be vertically raised and lowered. The rear end of the upper mandrel (8) is fixed to the upper mandrel mounting block (20). The second vertical platform (18) is slidably connected to a lower mandrel mounting block (21) that can be vertically raised and lowered. The rear end of the lower mandrel (9) is fixed to the lower mandrel mounting block (21). An adaptive lifting structure (22) is provided between the upper mandrel mounting block (20) and the first vertical platform (17), and between the lower mandrel mounting block (21) and the second vertical platform (18), which enables the upper mandrel (8) or the lower mandrel (9) to maintain a predetermined height and to be able to rise and fall adaptively.

4. The S-tube punching and flanging mechanism for the four-way valve pipe according to claim 3, characterized in that, The adaptive lifting structure (22) includes a positioning spring (23), which is sleeved on a screw (24). The first vertical platform (17) and the second vertical platform (18) are detachably provided with screw adjustment seats (25) on their sides. The bottom of the upper mandrel mounting block (20) and the lower mandrel mounting block (21) are provided with screw holes. The screw adjustment seat (25) is provided with a vertically penetrating screw groove (27). The screw (24) passes through the screw groove (27) upward. The large head (28) is limited to the area below the screw adjustment seat (25). The front end of the screw meshes with the screw hole. The two ends of the positioning spring (23) abut against the screw adjustment seat (25) and the upper mandrel mounting block (20) or the lower mandrel mounting block (21), respectively.

5. The S-tube punching and flanging mechanism for the four-way valve pipe according to claim 3, characterized in that, An adaptive rotation structure (30) and an adaptive swing structure (31) are provided between the lower core rod (9) and the lower core rod mounting block (21). The adaptive rotation structure (30) includes a bearing groove (32) opened on the front side of the lower mandrel mounting block (21) and a bearing assembly (33) locked in the bearing groove (32). The handle (34) of the lower mandrel (9) is fixedly connected to the inner ring of the bearing assembly (33). An annular pressure cap (35) is detachably provided on the outer side of the bearing groove (32). An axially extending inner limiting surface (38) is provided on the inner hole (36) wall of the annular pressure cap (35). An axially extending outer limiting surface (37) is provided on the outer side wall of the handle (34). The handle (34) passes through the inner hole (36). The inner limiting surface (38) and the outer limiting surface (37) are opposite to each other and there is a rotation gap between them that allows the handle to rotate within a certain range. The adaptive swing structure (31) includes a tenon (40) and a groove (41) respectively disposed at the rear end of the rod body (39) and the front end of the handle (34) of the lower core rod (9). The tenon (40) includes a circular part (42) and a connecting section (43) connecting the circular part (42) and the rod body (39). The groove (41) is shaped to match the tenon (40). The groove (41) extends in the horizontal direction. The tenon (40) is embedded in the groove (41). Swing gaps are provided between the rear end face of the rod body (39) and the front end face of the handle (34), as well as between the connecting section (43) and the groove (41), to allow the rod body (39) to swing and rotate within a certain range. The rod (39) is fitted with a positioning ring (46) at the front end. A limiting structure (47) for limiting the axial movement range of the positioning ring (46) is provided between the positioning ring (46) and the rod (39). A push spring (48) is provided between the positioning ring (46) and the annular cover (35). The front end of the positioning ring (46) abuts against the end face of the S tube (6).

6. The S-tube punching and flanging mechanism for the four-way valve pipe according to claim 1, characterized in that, The punching mechanism (4) includes a vertically arranged punch (5), which is mounted on a lifting block (50) via a horizontally extending punch mounting block (49). The lifting block (50) is vertically and vertically mounted on a first vertical platform (17) via a V-groove structure (51). The first vertical platform (17) is fixed on a first sliding seat (15). The lifting block (50) is connected to a lifting driver (52) on the first sliding seat (15) via a connecting rod (53). The first vertical platform (17) is provided with a slot (54) that allows the connecting rod (53) to pass through. The punch (5) includes a small cylindrical section (55) at the lower end and a large cylindrical section (56) at the upper end, which are connected by a flanged cone (57).

7. The S-tube punching and flanging mechanism for the four-way valve pipe according to claim 1, characterized in that, The feeding platform (2) includes a feeding base (58), the top of the feeding base (58) is provided with a feeding groove (3), and the two ends of the feeding base (58) are detachably fixed with U-shaped anti-reverse blocks (59). The width of the groove (60) of the anti-reverse block (59) is smaller than the outer diameter of the S-tube (6), and the distance between the two anti-reverse blocks (59) is greater than the length of the S-tube (6). The material feeding trough (3) is provided with an expansion groove (61) at one end. The inner diameter of the expansion groove (61) is adapted to the outer diameter of the large end (62) of the S tube (6). The top of the material feeding base (58) is provided with a claw relief groove (63) perpendicular to the material feeding trough (3). The S tube (6) passes through the claw relief groove (63). The bottom of the feeding base (58) is connected to the output shaft of the demolding lifting cylinder (64). The cylinder body of the demolding lifting cylinder (64) is fixed on the frame (1). A support seat (66) is provided on the cylinder body. The feeding base (58) abuts against the top of the support seat (66). The output shaft is connected to the feeding base (58) through the lifting guide block (68). The lifting guide block (68) passes through the guide block through hole (69) of the support seat (66).

8. A punching and flanging machine for an S-tube of a four-way valve pipe, characterized in that, Includes a frame (1), on which are provided: The feeding mechanism (70) is used to feed the S-tubes to be processed to the standby position (71) in a head-to-tail manner; The transfer mechanism (72) is used to clamp the S-tube (6) of the standby position (71) and move it to the transfer position (73). The receiving mechanism (74) is used to receive the S-tube (6) transferred from the intermediate position (73) and adjust its axial position; The punching and flanging mechanism (75) according to any one of claims 1-7 is used to receive the S-tube (6) transferred from the receiving mechanism (74) and to punch and flang the corresponding position; The transfer mechanism (76) is used to clamp the S-tube (6) on the transfer mechanism (72), the receiving mechanism (74), and the punching and flanging mechanism (75) through multiple sets of gripper assemblies (77), and to transfer it synchronously to the adjacent downstream mechanism; A direction detection and adjustment structure (78) is provided between the feeding mechanism (70) and the transfer mechanism (72) to detect the direction of the large and small ends of the S-tube (6) and rotate it 180 degrees in time to adjust the direction of the large and small ends of the S-tube (6).

9. The S-tube punching and flanging machine for a four-way valve pipe according to claim 8, characterized in that, The direction detection and adjustment structure (78) includes a detection component (79) located on the side of the standby position (71). The detection component (79) is fixed to the frame (1) by a detection frame (80), and the detection direction points to one end of the S-tube on the standby position (71). The gripper assembly (77) between the transfer mechanism (72) and the receiving mechanism (74) is connected to the rotary driver (81) and can rotate 180 degrees.

10. The S-tube punching and flanging machine for a four-way valve pipe according to claim 8, characterized in that, The feeding mechanism (70) includes a hoist (82), the top of which is provided with a discharge ramp (83), the lower side of which is connected to a straight U-shaped material channel (84), the front end of which is connected to a cylindrical material channel (85), the front end of which is provided with a material receiving section (86) with an open upper side and left and right sides, the material receiving section (86) forming the standby position (71), the U-shaped material channel (84) and the cylindrical material channel (85) are respectively connected to the vibration component (87), and the upstream side of the standby position (71) is provided with a blocking component (88) for preventing the second S-tube from moving forward. The transfer mechanism (72) includes a transfer slide (89) slidably connected to the frame (1). The transfer slide (89) is provided with two clamping blocks (91) that can be synchronously engaged and disengaged via a clutch synchronous driver (90). The two clamping blocks (91) have clamping grooves (92) on their opposite surfaces. The height of the two clamping grooves (92) is adapted to the height of the standby position (71). The transfer slide (89) is connected to the transfer slide translation driver (108) on the frame (1) and can move between the standby position (71) and the gripper assembly (77). The receiving mechanism (74) includes a positioning module (95) fixed to the frame (1) by a feeding positioning seat (94). The positioning module (95) is provided with an S-tube receiving groove (96). The S-tube receiving groove (96) is provided with abutment (97) and pusher (98) in two axial directions respectively. The abutment (97) is fixed to the positioning module (95). The pusher (98) is set on the positioning module (95) by a pusher driver (99) and can push the S-tube (6) on the S-tube receiving groove (96) toward the abutment (97). The top of the positioning module (95) is also provided with a gripper clearance groove (63) that intersects perpendicularly with the S-tube receiving groove (96). The transfer mechanism (76) includes a transfer frame (101) erected on the frame (1). A transverse seat (103) is slidably connected to the horizontal section (102) of the transfer frame (101). A gripper mounting plate (106) is horizontally arranged on the transverse seat (103) via a gripper lifting driver (107). A plurality of gripper assemblies (77) are provided on the gripper mounting plate (106). The transverse seat (103) is driven by the transverse driver (105) on the transfer frame (101) to reciprocate.

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