Length-adjustable self-cutting pump head pipe fitting assembling device and assembling method

Abstract

The invention relates to the technical field of production equipment for pressing pumps, in particular to a length-adjustable self-cutting pump head pipe fitting assembling device and method. Comprising a rotating disc, a feeding mechanism, an assembling mechanism and a discharging mechanism are arranged on the circumferential side of the rotating disc, a plurality of clamping grooves are evenly distributed in the edge of the rotating disc in the circumferential direction of the rotating disc, the assembling mechanism comprises a pipe fitting clamp, a cutting tool, a lifting sliding table and a guide rail, a through hole is formed in the lifting sliding table in the moving direction of the lifting sliding table in a penetrating mode, and the assembling mechanism further comprises a coaxial alignment assembly; the coaxial alignment assembly comprises a guide bush, the guide bush is provided with a guide hole communicated with the through hole, and the guide rail and the lifting sliding table are provided with a displacement transmitter and a displacement receiver respectively. The pump head connector is guided to be centered through the inner conical surface of the guide hole, the limiting ring keeps the hose and the pump head coaxial, the pressure sensor monitors pressure in all directions in real time, the hose is released immediately when the pressure is abnormal, deformation damage is avoided, and the insertion success rate and the assembly consistency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of production equipment for a compression pump, and in particular to an assembly device and an assembly method for a pump head pipe fitting with adjustable length and self-cutting function. Background Art

[0002] During the assembly of pump head tubing, an assembly device with adjustable length and a self-cutting function is crucial for improving production efficiency and ensuring assembly quality. Existing techniques often rely on fixed-length assembly methods or manual measurement and cutting, which are not only cumbersome and inefficient, but also prone to poor assembly accuracy due to human error, impacting subsequent performance.

[0003] The currently disclosed Chinese patent authorization publication number CN115139104B discloses an integrated automatic assembly machine for a pump that uses multiple manipulators to work in coordination. The machine is used to assemble a pump. The pump includes an outer cover, a roller, a straw, and a gland. The gland is snapped onto the outer cover, which is snapped onto the upper end of the roller. The straw is mounted on the lower end of the roller. The machine includes a workbench and a turntable. The turntable is rotatably mounted on the workbench so that the turntable can rotate relative to the workbench. The machine also includes a first manipulator device, a material introduction device, a sealing detection component, an outer cover pressing component, a positioning device, a position detection device, a second manipulator device, a gland introduction device, a gland pressing device, a locking device, a clip feeding device, a straw shearing device, a first discharge barrel, a discharge ejection device, and a second discharge barrel. The turntable is rotatably mounted on the workbench so that the station mounting holes on the turntable rotate with each turn of the turntable, thereby moving from the current station to the next station.

[0004] According to the aforementioned patent, a material introduction device delivers the components to be assembled to a designated location. A first robot then grabs and places the roller barrel onto a turntable. After a leak-proof seal test ensures the roller barrel is leak-free, the outer cover is precisely pressed onto the roller barrel. A second robot then installs and locks the gland into place, using a clamp to prevent it from loosening. A straw cutting device then cuts the long tube to the desired length and installs it on the lower end of the roller barrel, completing the assembly of the pump head tubing.

[0005] However, the patent lacks real-time monitoring of the assembly status during the straw insertion process, and cannot automatically shut down the device for protection when insertion is blocked or misaligned. If the pump head nozzle is of unqualified size or does not match the straw, it is very easy for the straw to bend under pressure. If forced assembly is still continued, obvious quality defects will occur, affecting the product's sealing and performance, and posing a major quality risk. Therefore, there is a need for a length-adjustable, self-cutting pump head pipe assembly device that can monitor the elongation and stress state of the hose in real time to achieve precise adjustment and assembly of the hose length. Summary of the Invention

[0006] In response to the problems existing in the existing technology, a length-adjustable self-cutting pump head pipe assembly device is provided. The pump head interface is guided to the center through the inner conical surface of the guide hole, the limit ring keeps the hose and the pump head coaxial, and the pressure sensor monitors the pressure in all directions in real time. In case of abnormality, the hose is released immediately to avoid deformation and damage, thereby improving the success rate of plug-in and assembly consistency.

[0007] In order to solve the problems of the prior art, the present invention provides a length-adjustable self-cutting pump head pipe assembly device, comprising a turntable, a feeding mechanism, an assembly mechanism and a discharge mechanism provided on the circumferential side of the turntable, a plurality of slots for positioning the pump head distributed evenly along the circumferential direction of the turntable edge, wherein the assembly mechanism comprises a pipe fixture, a cutting tool, a lifting slide and a guide rail, the pipe fixture and the cutting tool are arranged on the lifting slide in sequence from bottom to top, the lifting slide is arranged below the turntable and can move perpendicularly to the turntable surface on the guide rail, and the lifting slide is provided with a through hole along its moving direction for the hose to pass through from bottom to top Through hole, the assembly mechanism also includes a coaxial alignment component for keeping the pump head and the hose coaxial, the coaxial alignment component includes a guide bushing, the guide bushing is fixedly arranged on the top of the lifting slide, the guide bushing has a guide hole that can be plugged into and matched with the pump head interface and connected with the through hole, the guide hole is coaxial with the through hole, the diameter of the guide hole is larger than the diameter of the through hole, when the guide bushing rises and causes the pump head interface to be inserted into the guide hole, the pump head interface is in a coaxial limited state relative to the hose, the guide rail and the lifting slide are respectively provided with a displacement transmitter and a displacement receiver that cooperate with each other, forming a non-contact displacement detection system.

[0008] Preferably, the coaxial alignment assembly also includes a limit block, and each limit block is provided around the guide bushing. Each limit block can move radially along the guide bushing, and all the limit blocks together constitute a limit ring for positioning the part to be connected between the hose in the guide hole and the pump head interface, and the limit ring is coaxial with the guide hole.

[0009] Preferably, the edge of the guide hole at the upper end of the guide bushing has an inner conical surface for guiding the pump head interface into the guide hole.

[0010] Preferably, a sloped surface is provided on the inner side of the upper end of each limit block. When the upper end of the hose is inserted into the pump head interface and continues to rise, all the limit blocks are in a synchronous outward movement state under the pressure of the pump head interface along the sloped surface, so that the hose can continue to extend into the pump head interface until the pump head interface contacts the lifting slide.

[0011] Preferably, a fixed plate is fixedly provided around the guide bushing, and a compression spring is provided between each limit block and the corresponding fixed plate. When the limit block moves outward, the compression spring is in a compressed state.

[0012] Preferably, the guide bushing is provided with sliding grooves around which the corresponding limit blocks slide radially along the guide hole. The part of each limit block inserted into the guide hole is a trapezoidal end, and the part where each slide groove connects to the guide hole has a trapezoidal notch adapted to the corresponding trapezoidal end to prevent the limit block from pressing the hose.

[0013] Preferably, a pressure sensor is provided on each fixed plate, and the two ends of each compression spring are fixedly connected to the corresponding pressure sensor and the limit block respectively. The axial direction of the compression spring is parallel to the moving direction of the limit block, and each pressure sensor is electrically connected to the pipe clamp.

[0014] Preferably, a movable electromagnet is fixed on the outer side of the upper end of each limit block, and a fixed electromagnet is fixed around the upper end of the guide bushing. When the hose passes through the guide hole from bottom to top, the fixed electromagnet and the movable electromagnet are in a state of mutual repulsion due to power supply, so that the limit ring automatically opens to allow the hose to enter.

[0015] Preferably, a pair of the pipe fixtures, cutting tools and coaxial alignment components are symmetrically provided on the lifting slide to form a double workstation.

[0016] The present invention also provides a method for assembling a length-adjustable self-cutting pump head pipe fitting, comprising the following steps: S1, start the turntable to send the pump head to the assembly station; S2, start the pipe fixture to clamp the hose, and the hose is limited between the limit blocks; S3. The lifting slide rises, the pump head interface is first inserted into the guide hole, and then the limit block is pushed open until it contacts the lifting slide, and the hose is plugged into place.

[0017] Compared with the prior art, the present invention has the following advantages: 1. The present invention guides the pump head interface to smoothly enter the guide hole through the inner conical surface of the guide bushing, and uses the limiting ring formed by the limiting block to achieve precise coaxial positioning of the pump head and the hose, ensuring assembly centering. During the plug-in process, the slope surface of the limiting block cooperates with the compression spring, which not only provides space for the pump head interface, but also maintains a stable radial constraint to ensure smooth plug-in. At the same time, the pressure sensor monitors the stress state of each limiting block in real time. Once a pressure abnormality is detected, it determines that the hose is bent, and the control system immediately instructs the pipe fixture to release the hose, effectively preventing deformation or damage of the hose due to eccentricity or resistance, achieving precise centering, stable limiting and intelligent protection in the assembly process, and improving assembly quality and reliability; 2. The present invention forms a stopper structure by interlocking the trapezoidal end of the stopper with the trapezoidal notch of the chute. This effectively constrains the radial movement of the stopper, preventing it from excessively moving inward under the elastic force of the compression spring and intruding into the guide hole. This avoids applying pressure to the hose during insertion, thereby eliminating the risk of deformation due to squeezing. While ensuring that the stopper provides stable radial constraint on the hose and maintains coaxial alignment, it also ensures that the hose can be smoothly and unobstructedly connected to the pump head interface, improving assembly reliability and product quality. 3. The present invention arranges a fixed electromagnet and a movable electromagnet that cooperate with each other on the guide bushing and the limit block, and utilizes the repulsive force generated when power is turned on to drive the limit blocks to move outward synchronously, so that the limit ring automatically opens before the hose passes through the guide hole, effectively preventing the upper end of the hose from being deformed due to direct pressure on the limit block.

[0018] After the hose successfully enters the stop ring, the electromagnet is de-energized and the stop block resets under the action of the compression spring. The inner diameter of the resulting stop ring matches the outer diameter of the hose, providing a stable stop for the hose and ensuring it remains coaxial with the pump head. This achieves precise stoppage of the hose to be connected, maintaining coaxiality with the pump head and improving connection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional schematic diagram of a length-adjustable self-cutting pump head pipe assembly device of the present invention. Figure 1 ; Figure 2 This is a three-dimensional schematic diagram of a length-adjustable self-cutting pump head pipe assembly device of the present invention. Figure 2 ; Figure 3 This is a partial three-dimensional cross-sectional view of a length-adjustable self-cutting pump head pipe assembly device of the present invention. Figure 1 ; Figure 4 This is a partial three-dimensional cross-sectional view of a length-adjustable self-cutting pump head pipe assembly device of the present invention. Figure 2 ; Figure 5 It is a three-dimensional structural diagram of an assembly mechanism of a length-adjustable self-cutting pump head pipe assembly device of the present invention; Figure 6 It is a planar cross-sectional view of a pump head interface of a length-adjustable self-cutting pump head pipe assembly device of the present invention, wherein the pump head interface is inserted into a guide hole and initially connected with a hose; Figure 7 It is a three-dimensional structural cross-sectional view of a pump head interface of a length-adjustable self-cutting pump head pipe assembly device of the present invention, wherein the pump head interface is inserted into a guide hole and initially connected with a hose; Figure 8It is a planar sectional view of the pump head interface insertion guide hole and the deep insertion of the hose of a length-adjustable self-cutting pump head pipe fitting assembly device of the present application; Figure 9 It is a three-dimensional structural sectional view of the pump head interface insertion guide hole and the deep insertion of the hose of a length-adjustable self-cutting pump head pipe fitting assembly device of the present application; Figure 10 It is a radial three-dimensional structural sectional view of the guide bushing of a length-adjustable self-cutting pump head pipe fitting assembly device of the present application; Figure 11 It is a planar sectional view of the cut hose of a length-adjustable self-cutting pump head pipe fitting assembly device of the present application; Figure 12 It is a three-dimensional structural sectional view of the cut hose of a length-adjustable self-cutting pump head pipe fitting assembly device of the present application.

[0020] The figure label is: 1, rotating disc; 11, clamping groove; 12, fixed ring; 2, pump head; 3, hose; 4, pipe fitting clamp; 5, cutting tool; 51, cutting groove; 52, stamping cylinder; 6, lifting slide; 61, through hole; 7, guide rail; 71, displacement transmitter; 72, displacement receiver; 73, fixed clamp; 8, coaxial alignment assembly; 81, guide bushing; 811, guide hole; 812, fixed plate; 8121, compression spring; 8122, pressure sensor; 813, sliding groove; 82, limit block; 821, trapezoidal end; 822, movable electromagnet; 823, fixed electromagnet. DETAILED DESCRIPTION

[0021] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application is described in further detail below in combination with the drawings and specific embodiments.

[0022] Reference Figures 1-9As shown, a length-adjustable self-cutting pump head pipe assembly device includes a turntable 1, a feeding mechanism, an assembly mechanism and a discharge mechanism are provided on the circumferential side of the turntable 1, and a plurality of slots 11 for positioning the pump head 2 are evenly distributed along the circumferential direction of the edge of the turntable 1, wherein the assembly mechanism includes a pipe fixture 4, a cutting tool 5, a lifting slide 6 and a guide rail 7, wherein the pipe fixture 4 and the cutting tool 5 are sequentially arranged on the lifting slide 6 from bottom to top, the lifting slide 6 is arranged below the turntable 1 and can move perpendicularly to the surface of the turntable 1 on the guide rail 7, and the lifting slide 6 is provided with a through hole 61 for the hose 3 to pass through from bottom to top along its moving direction. The assembly mechanism also includes a through hole 61 for holding the pump head 2 is a coaxial alignment component 8 coaxial with the hose 3. The coaxial alignment component 8 includes a guide bushing 81, which is fixedly arranged on the top of the lifting slide 6. The guide bushing 81 has a guide hole 811 that can be plugged into and matched with the interface of the pump head 2 and communicated with the through hole 61. The guide hole 811 is coaxial with the through hole 61, and the diameter of the guide hole 811 is larger than the diameter of the through hole 61. When the guide bushing 81 rises and causes the interface of the pump head 2 to be inserted into the guide hole 811, the interface of the pump head 2 is in a coaxial limited state relative to the hose 3. The guide rail 7 and the lifting slide 6 are respectively provided with a displacement transmitter 71 and a displacement receiver 72 that cooperate with each other, forming a non-contact displacement detection system.

[0023] The outer side of the turntable 1 is provided with a fixed ring 12 which is in a stationary state relative to the turntable 1 to prevent the pump head 2 from being thrown out of the slot 11 when the turntable 1 rotates. The fixed ring 12 has a loading port and a unloading port which can correspond to the slot 11.

[0024] The loading mechanism and unloading mechanism are not shown in the figures.

[0025] The driving source for driving the turntable 1 to rotate is not shown in the figure.

[0026] The lower end of the guide rail 7 is provided with a fixing fixture 73 for clamping the lower hose 3 after the upper hose 3 is cut off, so that in the next round of assembly, the pipe fixture 4 is driven to move by the lifting slide 6 to pull the hose 3 out of the fixing fixture 73 again, thereby realizing continuous feeding and precise fixed-length assembly of the hose 3.

[0027] The lifting slide 6 is provided with a cutting groove 51 along the radial direction of the through hole 61 for the cutting tool 5 to slide, and the lifting slide 6 is provided with a punching cylinder 52 for driving the cutting tool 5 to move.

[0028] When the pump head 2 is loaded, the loading mechanism inserts the pump head 2 into the slot 11 on the turntable 1. The pump head 2 remains stable under the restraining action of the fixing ring 12 and will not fall out of the slot 11 due to centrifugal force. As the turntable 1 rotates the pump head 2 to the assembly station, the assembly mechanism begins to assemble the pump head 2 and the hose 3 and cut them to length.

[0029] Before the assembly of the hose 3, the upper end of the hose 3 has been passed through the through hole 61 and extended into the guide hole 811 of the guide bushing 81 with the initial lowering action of the lifting slide 6, at this time the pump head 2 is fixed in the clamping groove 11 of the rotating disc 1 and remains stationary.

[0030] Then, the lifting slide 6 starts to move upward along the direction perpendicular to the surface of the rotating disc 1 under the guidance of the guide rail 7. During the lifting of the lifting slide 6, the hose 3 that has been passed through the through hole 61 of the lifting slide 6 is synchronously moved upward under the clamping of the pipe clamp 4. With the continuous upward movement of the lifting slide 6, the guide bushing 81 gradually approaches and finally contacts the interface end of the pump head 2.

[0031] When the interface of the pump head 2 is inserted into the guide hole 811, the inner wall of the guide hole 811 limits the pump head 2 interface in the circumferential direction, forcing its axis to coincide with the axis of the through hole 61 and the internal hose 3, achieving coaxial alignment of the pump head 2 and the hose 3. It ensures that the hose 3 can be accurately inserted into the interface of the pump head 2 in the subsequent assembly process, avoiding assembly failure or poor sealing due to eccentricity.

[0032] After the guide bushing 81 completes the positioning of the pump head 2 and ensures the coaxial state, the lifting slide 6 continues to rise, so that the top end of the hose 3 gradually extends into the interior of the pump head 2 interface, until the pump head 2 interface passes through the guide hole 811 and contacts the top surface of the lifting slide 6, that is, reaches the preset insertion depth. At this time, the assembly system monitors the lifting displacement of the lifting slide 6 in real time through the non-contact displacement detection system composed of the displacement transmitter 71 and the displacement receiver 72, accurately captures the position change of the lifting slide 6, and ensures the accuracy of the insertion length of the hose 3.

[0033] When the hose 3 is inserted in place, the lifting slide 6 stops rising, and the assembly enters the cutting-off stage. At this time, the pipe clamp 4 releases the hose 3, and the lifting slide 6 descends. Through displacement monitoring, when the cutting-off tool 5 reaches the cutting-off position, the stamping cylinder 52 provided on the lifting slide 6 is started, driving the cutting-off tool 5 to slide along the radial cutting groove 51 of the lifting slide 6 to the center of the through hole 61. The cutting-off tool 5 advances under the push of the stamping cylinder 52, and the sharp edge of the cutting-off tool 5 acts on the predetermined cutting-off position of the hose 3 to implement the cutting-off operation. After cutting-off is completed, the cutting-off tool 5 retreats to the initial position under the return action of the stamping cylinder 52.

[0034] Before the cutting-off operation, the fixed clamp 73 clamps the hose 3 below the cutting-off position to prevent the hose 3 from falling after being cut off. After the hose 3 is cut off, the lifting slide 6 is lowered again, so that the lower end of the hose 3 assembled with the pump head 2 is separated from the guide bushing 81.

[0035] Subsequently, the assembled hose 3 originally cut and left above is retained in the card slot 11 together with the pump head 2, rotates out of the assembly station with the rotating disc 1 and is removed from the rotating disc 1 by the unloading mechanism. When the assembly of the next pump head 2 is carried out, after the hose 3 is clamped by the pipe clamp 4, the fixing clamp 73 is loosened, the lifting slide 6 is raised, and the hose 3 is pulled out of the fixing clamp 73 by a new length, so that a new round of assembly is carried out.

[0036] During the entire assembly process, the non-contact displacement detection system continuously monitors the displacement of the lifting slide 6 to provide accurate position feedback for the control system, ensuring that each lifting, lowering, clamping and cutting action is strictly in accordance with the preset program, thereby achieving accurate control of the length of the hose 3 and continuous, efficient and reliable automatic assembly.

[0037] Referring to Figs. 1, 2 and 3, Figure 1 and Figure 4-Figure 12 , the coaxial alignment assembly 8 further comprises a limiting block 82, and the guide bushing 81 is provided with one limiting block 82 around the periphery, each limiting block 82 can move radially along the guide bushing 81, and all the limiting blocks 82 collectively form a limiting ring for positioning the part to be inserted of the hose 3 and the pump head 2 interface in the guide hole 811, and the limiting ring is coaxial with the guide hole 811.

[0038] When the lifting slide 6 moves upward, the guide bushing 81 approaches and begins to be inserted with the pump head 2 interface, the outer wall of the pump head 2 interface first contacts the limiting block 82 arranged around the periphery of the guide bushing 81, and under the push of the pump head 2 interface, each limiting block 82 slides radially outward synchronously to provide space for the insertion of the pump head 2 interface.

[0039] When the pump head 2 interface continues to insert into the guide hole 811, the part to be inserted of the pump head 2 interface gradually enters the limiting ring formed by all the limiting blocks 82, thereby exerting a uniform radial restraining force on the outer wall of the pump head 2 interface, keeping the axis of the pump head 2 interface highly consistent with the axis of the limiting ring and the guide hole 811, and the limiting ring plays an auxiliary positioning role for the insertion depth of the pump head 2 interface, ensuring that the top end of the hose 3 can be accurately aligned with the internal passage of the pump head 2 interface during subsequent insertion, and realizing the accurate coaxial positioning of the pump head 2 and the hose 3 in the assembly stage.

[0040] Referring to Figs. 1, 2 and 3, Figure 4-Figure 9 , Figure 11 and Figure 12 , the edge of the guide hole 811 at the upper end of the guide bushing 81 has an inner tapered surface for guiding the pump head 2 interface into the guide hole 811.

[0041] When the lifting slide 6 moves upward, the guide bush 81 approaches the pump head 2 interface, the outer edge of the pump head 2 interface first contacts the inner tapered surface of the edge of the upper end guide hole 811 of the guide bush 81, which forms a gradually narrowing guide entrance, which can effectively capture and receive the slightly deviated pump head 2 interface.

[0042] During the contact process, the inclined surface of the inner tapered surface applies a radial guiding force to the pump head 2 interface, guiding it to smoothly slide into the inside of the guide hole 811, thereby compensating for the slight centering error during assembly, ensuring that the pump head 2 interface can be smoothly and accurately inserted into the guide hole 811, and achieving stable and reliable coaxial alignment.

[0043] Referring to Figure 4-Figure 9 , Figure 11 and Figure 12 , the inner side of the upper end of each limiting block 82 is provided with a slope surface, when the upper end of the hose 3 is inserted into the pump head 2 interface and continues to rise, all limiting blocks 82 are in a synchronous outward moving state under the pressing of the slope surface of the pump head 2 interface, so that the hose 3 can continue to extend into the pump head 2 interface until the pump head 2 interface contacts the lifting slide 6.

[0044] When the upper end of the hose 3 is inserted into the pump head 2 interface and continues to rise with the lifting slide 6, the pump head 2 interface contacts the slope surface on the inner side of the upper end of each limiting block 82, and under the action of the continuous upward thrust, the force exerted by the slope surface on the pump head 2 interface is decomposed into the radial component of the limiting block 82, which pushes each limiting block 82 to move outward along the radial direction of the guide bush 81, thereby expanding the inner diameter of the limiting ring formed by the limiting blocks 82, providing space for the pump head 2 interface to enter the guide hole 811 and the insertion of the hose 3.

[0045] During the upward insertion of the hose 3, the hose 3 always maintains a coaxial state with the pump head 2 under the limiting of the limiting block 82, until the pump head 2 interface passively pushes out the limiting block 82, the hose 3 has been inserted into the pump head 2 interface and continues to extend into the inside of the pump head 2 interface, until the pump head 2 interface completely passes through the limiting block 82 and finally contacts the top surface of the lifting slide 6, realizing assembly in place.

[0046] Referring to Figure 4-Figure 12 , a fixed plate 812 is fixedly arranged around the guide bush 81, and a compression spring 8121 is arranged between each limiting block 82 and the corresponding fixed plate 812, when the limiting block 82 moves outward, the compression spring 8121 is in a compressed state.

[0047] When the lifting slide 6 drives the hose 3 to move upward, the hose 3 moves upward under the pushing of the lifting slide 6, and the top end of the hose 3 is inserted into the interface of the static pump head 2. As the lifting slide 6 further rises, the outer wall of the pump head 2 interface contacts the inclined surface on the inner side of the upper end of each limiting block 82, the interface applies an outward force to the inclined surface, pushes the limiting block 82 to overcome the elastic force of the compression spring 8121, and moves radially and synchronously outward along the guide bushing 81. At this time, the compression spring 8121 is compressed.

[0048] While the limiting block 82 moves outward to make room, the hose 3 continues to penetrate the pump head 2 interface, and the insertion process is completed. The limiting block 82 always tends to reset inward under the pre-tightening action of the compression spring 8121, and forms a stable circumferential constraint on the outer wall of the pump head 2 interface, ensuring that the hose 3 and the pump head 2 always maintain a coaxial state during the rising insertion process, until the pump head 2 interface completely passes through the limiting block 82, and the hose 3 reaches the preset insertion depth and is assembled in place.

[0049] Referring to Figures 6-10 As shown, the guide bushing 81 is provided with a sliding groove 813 around the periphery for the corresponding limiting block 82 to slide radially along the guide hole 811. The portion of each limiting block 82 inserted into the guide hole 811 is a trapezoidal end 821, and the portion of each sliding groove 813 connected with the guide hole 811 has a trapezoidal notch adapted to the corresponding trapezoidal end 821 to block the limiting block 82 from pressing the hose 3.

[0050] When the hose 3 rises with the lifting slide 6 and is inserted into the pump head 2 interface, the outer wall of the pump head 2 interface pushes each limiting block 82 to move radially outward along the sliding groove 813 on the guide bushing 81. At this time, the trapezoidal end 821 of the limiting block 82 slides in the sliding groove 813, and the trapezoidal notch at the joint of the trapezoidal end 821 and the sliding groove 813 cooperates with each other to form a limiting structure.

[0051] The inclined surface of the trapezoidal notch and the inclined surface of the trapezoidal end 821 of the limiting block 82 fit together, which can effectively block the limiting block 82 from moving inward excessively under the elastic force of the compression spring 8121, prevent the inner end of the limiting block 82 from protruding into the guide hole 811 to press the hose 3, thereby avoiding the hose 3 from being squeezed and deformed, ensuring that the hose 3 is smoothly inserted into the pump head 2 interface, and maintaining the coaxial centering state of the pump head 2 interface and the hose 3.

[0052] Referring to Figure 6-Figure 12 As shown, each fixed plate 812 is provided with a pressure sensor 8122, and the two ends of each compression spring 8121 are fixedly connected with the corresponding pressure sensor 8122 and the limiting block 82, respectively. The axis direction of the compression spring 8121 is parallel to the moving direction of the limiting block 82, and each pressure sensor 8122 is electrically connected with the pipe clamp 4.

[0053] When one of the pressure sensors 8122 senses abnormal pressure, it indicates that the portion of the interface between the hose 3 and the pump head 2 to be connected is in a bent state, and the pipe clamp 4 immediately releases the hose 3.

[0054] When all stoppers 82 have secured the hose 3, the compression spring 8121 provides a preload, maintaining contact between the trapezoidal end 821 of the stopper 82 and the trapezoidal notch, ensuring the hose 3 is stably secured without compressing it. During assembly, if the hose 3 is misaligned with the pump head 2 interface or there is insertion resistance, causing local bending of the hose 3, this can lead to an abnormal increase in pressure on one side of the stopper 82. This pressure change is monitored in real time by the corresponding pressure sensor 8122 and transmitted to the control system.

[0055] If any pressure sensor 8122 detects a pressure different from that of the other pressure sensors 8122, it determines that hose 3 is bent. The control system immediately instructs pipe fixture 4 to release hose 3, halting forced assembly. This effectively prevents deformation, damage, or assembly failure of hose 3 caused by forced insertion, enabling intelligent monitoring and proactive protection of the assembly process, thereby improving product yield.

[0056] See also Figure 6-Figure 12 As shown, a movable electromagnet 822 is fixedly provided on the outer side of the upper end of each limit block 82, and a fixed electromagnet 823 is fixedly provided around the upper end of the guide bushing 81. When the hose 3 passes through the guide hole 811 from bottom to top, the fixed electromagnet 823 and the movable electromagnet 822 are in a state of mutual repulsion due to power supply, so that the limit ring automatically opens to allow the hose 3 to enter.

[0057] When the hose 3 passes through the guide hole 811 from bottom to top, the fixed electromagnets 823 around the upper end of the guide bushing 81 and the movable electromagnets 822 corresponding to the outer side of the upper end of each limit block 82 are energized at the same time, and a mutually repulsive electromagnetic force is generated between the two. The repulsive force acts on the limit blocks 82, pushing each limit block 82 to move synchronously outward along the radial direction of the guide bushing 81, overcoming the preload force of the compression spring 8121, so that the limit ring formed by all the limit blocks 82 automatically opens, expanding the entrance, thereby providing sufficient clearance space for the smooth entry of the hose 3, ensuring that the hose 3 can smoothly pass through the guide hole 811 before being connected to the pump head 2 interface, and avoiding the deformation of the tube mouth of the upper end of the hose 3 due to the pressure of the limit block 82.

[0058] After the hose 3 enters between all the limit blocks 82 , the fixed electromagnet 823 and the movable electromagnet 822 are powered off, thereby limiting the hose 3 and maintaining a coaxial state with the pump head 2 .

[0059] See also Figure 1-Figure 5As shown, a pair of said pipe clamp 4, cutting tool 5 and coaxial alignment assembly 8 are symmetrically arranged on the lifting slide 6, forming double stations.

[0060] The fixed ring 12 has two discharge ports.

[0061] The rotary disc 1 rotates once, and two pump heads 2 enter the double stations at the same time.

[0062] When the rotary disc 1 rotates once, the clamping groove 11 on the edge of the rotary disc 1 drives the two pump heads 2 to move synchronously to the assembly station, and at this time, the symmetrically arranged pair of coaxial alignment assemblies 8, pipe clamps 4 and cutting tools 5 in the double stations of the assembly mechanism correspond to the interface positions of the two pump heads 2, respectively.

[0063] With the upward movement of the lifting slide 6, the guide bushings 81 in the two sets of coaxial alignment assemblies 8 are respectively inserted into the interfaces of the two pump heads 2, realizing the coaxial alignment of the respective hoses 3 and the pump heads 2, and at the same time, the two sets of pipe clamps 4 clamp the corresponding hoses 3 and synchronously perform the insertion and cutting actions, completing the parallel assembly of the two pump heads 2.

[0064] After assembly, the rotary disc 1 continues to rotate, synchronously conveying the two assembled pump heads 2 to the two discharge port positions arranged on the fixed ring 12, so that the discharge mechanism simultaneously discharges the double stations, thereby realizing the double-station synchronous feeding, assembly and discharging of the pump heads 2, and improving the production efficiency.

[0065] A length-adjustable self-cutting pump head pipe assembly method applied to the length-adjustable self-cutting pump head pipe assembly device described above, comprising the following steps: S1, starting the rotary disc 1 to send the pump head 2 to the assembly station; S2, starting the pipe clamp 4 to clamp the hose 3, and at the same time, the hose 3 is limited between the limiting blocks 82; S3, the lifting slide 6 rises, the pump head 2 interface is first inserted into the guide hole 811, then pushes away the limiting block 82, until it contacts with the lifting slide 6, and the hose 3 is inserted in place.

[0066] The inner tapered surface of the guide hole 811 of the guide bushing 81 guides the pump head 2 interface to smoothly enter, automatically corrects the deviation in the initial butt joint stage of the pump head 2 interface, effectively absorbs the slight axial deviation caused by positioning or conveying in the assembly process, significantly reduces the insertion resistance, and improves the centering efficiency. And the limiting ring formed by the limiting block 82 uniformly constrains the outer wall of the hose 3 in the radial direction, ensuring that the hose 3 always maintains the coaxial state with the pump head 2 interface throughout the insertion process, preventing misalignment caused by shaking or unbalanced load.

[0067] The pressure sensor 8122 arranged between each limiting block 82 and the fixed plate 812 is used to monitor the contact pressure in each direction in real time and independently. When the hose 3 is locally bent due to misalignment or external interference, the pressure on one side will abnormally increase, and the control signal will be triggered to release the hose 3 from the pipe clamp 4, interrupt the rising action, and avoid the damage of the interface or the deformation of the hose 3 caused by hard pushing. The whole process realizes the closed-loop control from the guidance centering, dynamic limiting to intelligent protection, improves the success rate of single insertion, and guarantees the stability and consistency of the large-scale automatic assembly.

[0068] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A length-adjustable, self-cutting pump head pipe assembly device, comprising a turntable, a feeding mechanism, an assembly mechanism, and a discharge mechanism disposed on the circumference of the turntable, and a plurality of slots for positioning the pump head distributed uniformly along the circumference of the turntable edge; characterized in that: The assembly mechanism includes a pipe clamp, a cutting tool, a lifting slide and a guide rail; the pipe clamp and the cutting tool are arranged on the lifting slide in sequence from bottom to top; the lifting slide is arranged below the turntable and can move perpendicular to the turntable surface on the guide rail; the lifting slide is provided with a through hole along its moving direction for the hose to pass through from bottom to top; the assembly mechanism also includes a coaxial alignment component for keeping the pump head and the hose coaxial, and the coaxial alignment component includes a guide bushing; the guide bushing is fixedly arranged on the top of the lifting slide, and the guide bushing has a guide hole that can be plugged into and matched with the pump head interface and connected to the through hole, the guide hole is coaxial with the through hole, and the diameter of the guide hole is larger than the diameter of the through hole; when the guide bushing rises and causes the pump head interface to be inserted into the guide hole, the pump head interface is in a coaxial limit state relative to the hose; the guide rail and the lifting slide are respectively provided with a displacement transmitter and a displacement receiver that cooperate with each other to form a non-contact displacement detection system.

2. A length-adjustable self-cutting pump head pipe assembly device according to claim 1, characterized in that: The coaxial alignment assembly also includes a limit block, which is provided around the guide bushing. Each limit block can move radially along the guide bushing. All the limit blocks together constitute a limit ring for positioning the part of the hose in the guide hole and the pump head interface to be connected. The limit ring is coaxial with the guide hole.

3. A length-adjustable self-cutting pump head pipe assembly device according to claim 2, characterized in that: The edge of the guide hole at the upper end of the guide bushing is provided with an inner conical surface for guiding the pump head interface to enter the guide hole.

4. A length-adjustable self-cutting pump head pipe assembly device according to claim 3, characterized in that: There is a sloped surface on the inner side of the upper end of each limit block. When the upper end of the hose is inserted into the pump head interface and continues to rise, all the limit blocks are in a synchronous outward movement state under the pressure of the pump head interface along the sloped surface, allowing the hose to continue to penetrate the pump head interface until the pump head interface contacts the lifting slide.

5. The length-adjustable self-cutting pump head pipe assembly device according to claim 4, characterized in that: A fixed plate is fixed around the guide bushing, and a compression spring is provided between each limit block and the corresponding fixed plate. When the limit block moves outward, the compression spring is in a compressed state.

6. The length-adjustable self-cutting pump head pipe assembly device according to claim 2, characterized in that: The guide bushing is provided with sliding grooves around which the corresponding limit blocks slide radially along the guide hole. The part of each limit block inserted into the guide hole is a trapezoidal end, and the part where each slide groove connects to the guide hole has a trapezoidal notch adapted to the corresponding trapezoidal end to prevent the limit block from pressing the hose.

7. The length-adjustable self-cutting pump head pipe assembly device according to claim 5, characterized in that: A pressure sensor is provided on each fixed plate, and the two ends of each compression spring are fixedly connected to the corresponding pressure sensor and the limit block respectively. The axial direction of the compression spring is parallel to the moving direction of the limit block, and each pressure sensor is electrically connected to the pipe fixture.

8. The length-adjustable self-cutting pump head pipe assembly device according to claim 2, characterized in that: A movable electromagnet is fixed on the outer side of the upper end of each limit block, and a fixed electromagnet is fixed around the upper end of the guide bushing. When the hose passes through the guide hole from bottom to top, the fixed electromagnet and the movable electromagnet are in a state of mutual repulsion due to power supply, so that the limit ring automatically opens to allow the hose to enter.

9. The length-adjustable self-cutting pump head pipe assembly device according to claim 1, characterized in that: A pair of pipe fixtures, cutting tools and coaxial alignment components are symmetrically arranged on the lifting slide to form a double workstation.

10. A method for assembling a length-adjustable self-cutting pump head pipe fitting, applied to a length-adjustable self-cutting pump head pipe fitting assembly device according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1, start the turntable to send the pump head to the assembly station; S2, start the pipe fixture to clamp the hose, and the hose is limited between the limit blocks; S3. The lifting slide rises, the pump head interface is first inserted into the guide hole, and then the limit block is pushed open until it contacts the lifting slide, and the hose is plugged into place.

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