A press-fitting device for a valve

Abstract

This application relates to a press-fitting device for a valve, belonging to the technical field of valve assembly; it includes a positioning tooling, and the upper surface of the positioning tooling is provided with a press-fitting station for placing the valve body; a down press is arranged above the positioning tooling, and the down press is used to move in a direction close to or away from the press-fitting station; it also includes a displacement sensor and a controller, the displacement sensor is electrically connected to the controller to detect the downward displacement distance of the down press relative to the press-fitting station, and the controller is used to control the movement of the down press in a direction close to or away from the press-fitting station according to the detection result of the displacement sensor; this application has the effect of improving the press-fitting accuracy and reducing the workpiece rejection rate during the press-fitting process of the valve seat and the valve body.

Description

Technical Field

[0001] This application relates to the technical field of valve assembly, and particularly to a press-fitting device for valves. Background Art

[0002] When assembling valve functional components such as normally open valves and normally closed valves, a press-fitting process is often required to press-fit two workpieces together to form a tight fit, while meeting certain assembly accuracy requirements; for example, when press-fitting a valve seat and a valve body together, such that under the action of the push rod overcoming the spring force, the distance protruding from the upper end face of the valve body is within a specified distance value range.

[0003] However, when the existing press-fitting device press-fits the valve seat and the valve body, during the press-fitting process, the press-fitting force needs to reach thousands of Newtons to complete. If the force is too large or too small, the press-fitting will not be in place, and the distance protruding from the upper end face of the valve body will exceed the accuracy requirements, thus easily increasing the scrap rate of the workpiece, so it needs to be improved. Summary of the Invention

[0004] In order to improve the press-fitting accuracy and reduce the scrap rate of workpieces during the press-fitting process of the valve seat and the valve body, this application provides a press-fitting device for valves.

[0005] A press-fitting device for valves provided by this application includes a positioning tooling. The upper surface of the positioning tooling is provided with a press-fitting station for placing the valve body. A down press is arranged above the positioning tooling, and the down press is used to move in a direction approaching or departing from the press-fitting station. It further includes a displacement sensor and a controller. The displacement sensor is electrically connected to the controller to detect the downward displacement distance of the down press relative to the press-fitting station, and the controller is used to control the movement of the down press in a direction approaching or departing from the press-fitting station according to the detection result of the displacement sensor.

[0006] By adopting the above technical solution, precise control of the movement of the down press is achieved through the displacement sensor and the controller. Since the down press can move in a direction approaching or departing from the press-fitting station, when the down press moves in a direction approaching the press-fitting station, the press-fitting of the valve body can be realized. Accordingly, the movement distance of the displacement sensor can be used to represent the press-fitting force of the down press on the valve, so as to improve the press-fitting accuracy and reduce the scrap rate of workpieces.

[0007] Preferably, the down press includes a pressing cylinder, a down cylinder, a test ejector rod, and a first spring; the driving end of the pressing cylinder is connected to the down cylinder, the pressing station is located on the moving path of the down cylinder when it moves along with the driving end of the pressing cylinder, and one end of the down cylinder facing the pressing tooling is open; the test ejector rod and the first spring are inserted into the down cylinder, the first spring is sleeved outside the test ejector rod, and the first spring is connected between the test ejector rod and the inner wall of the down cylinder. When the first spring is not deformed, the bottom of the test ejector rod is located outside the down cylinder; the displacement sensor is used to detect the moving distance of the test ejector rod relative to the down cylinder.

[0008] The valve body includes a valve seat, a valve body sleeved on the top of the valve seat, a push rod inserted into the valve body, and a second spring; the first spring is sleeved on the push rod, and one end of the first spring abuts against the valve seat and the other end abuts against the push rod; the bottom end wall of the down cylinder is used to contact the top wall of the valve body of the valve body.

[0009] By adopting the above technical solution, the valve seat, the valve body, and the second spring are placed at the predetermined positions at the pressing station, the pressing cylinder is started to drive the down cylinder to move downward, so that the down cylinder drives the test ejector rod to move downward and the test ejector rod is inserted into the valve body and contacts the upper end of the push rod. At this time, both the first spring and the second spring are not deformed. Then, the down cylinder is driven to move downward, and the down cylinder presses the top wall of the valve body, so that the valve body moves relative to the valve seat, thereby realizing the press-fitting of the valve body and the valve seat. During this process, the test ejector rod is pushed by the push rod and retracts into the down cylinder, and the displacement sensor detects the moving distance of the test ejector rod relative to the down cylinder. When the moving distance reaches the specified distance, the controller controls the down cylinder to move back in the direction away from the pressing station.

[0010] Preferably, it further includes a turntable and a rotating member for driving the turntable to rotate. There are several positioning toolings, which are distributed on the surface of the turntable along the rotation center of the turntable. Any of the positioning toolings can rotate to the lower part of the down press along with the rotation of the turntable, so that the corresponding pressing station is located on the moving path of the down press; it further includes a pressing trigger, and the pressing trigger is electrically connected to the controller to be used for detecting whether there is a positioning tooling with a valve body on the moving path of the down press. The controller is used to control the opening and closing of the down press and the displacement sensor based on the detection result of the pressing trigger.

[0011] By adopting the above technical solution, the setting of the turntable can realize the continuous press-fitting processing of a batch of valve bodies, and the pressing trigger is used to automatically detect whether there is a positioning tooling with a valve body moving to the lower part of the down press, so as to realize the batch automatic press-fitting processing of the valve bodies and improve the processing efficiency.

[0012] Preferably, the press-fitting trigger is located on one side below the lower press for taking an image of the positioning tooling that has rotated below the lower press. The controller is configured to obtain the image, determine the actual position of the valve body in the image, compare the actual position with a preset reference position. If the comparison is inconsistent, the deviation value between the actual position and the reference position is calculated, the correction angle is calculated, and the turntable is controlled to rotate by an angle consistent with the correction angle and then stop, so that the actual position is consistent with the reference position. When the valve body in the image of the positioning tooling located below the lower press is at the reference position in the image, the push rod of the corresponding valve body is directly below the open end at the lower end of the pressing cylinder.

[0013] By adopting the above technical solution, an image of the positioning tooling that has rotated below the lower press and the valve body it holds is taken to obtain the actual position, which refers to the orientation of the valve body in the image. Since the press-fitting trigger does not rotate with the rotation of the turntable, the viewing angle range that the press-fitting trigger can capture is fixed. Therefore, it is possible to determine whether the current positioning tooling has rotated to the specified position based on the actual position. The specific judgment method is to compare the actual position with the reference position, and the reference position can be considered as the position where the positioning tooling rotates directly below the lower press and the push rod of the valve body is directly below the open end of the pressing cylinder. If there is a deviation between the actual position and the reference position, the correction angle is calculated based on the deviation value, and the turntable is controlled to rotate by an angle consistent with the correction angle and then stop, so that the push rod of the valve body is directly below the open end at the lower end of the pressing cylinder.

[0014] Preferably, after obtaining the image, the controller is further configured to determine the distance value between the top of the valve body and the top of the positioning tooling, compare the distance value with a preset distance and calculate the difference value, and determine the target moving distance based on the difference value. The controller is configured to control the upper movement and reset of the lower press when the moving distance of the test push rod relative to the pressing cylinder detected by the displacement sensor reaches the target moving distance.

[0015] By adopting the above technical solution, the image detected by the press-fit trigger can also be used to obtain the distance value between the top of the valve body and the top of the positioning tooling, thereby determining the sleeve depth of the valve body of the valve body on the top of the valve seat. Based on this distance value, the difference of the remaining preset distances is determined, and then the target movement distance is determined based on the difference. The target movement distance refers to the target value of the movement distance of the relevant test push rod relative to the lower pressing cylinder detected by the displacement sensor when the lower press presses the valve body. When the movement distance detected by the displacement sensor reaches the target movement distance value, the press fitting is considered to be completed, and the controller controls the lower press to move up and reset. In short, since the sleeve depth of the valve body relative to the valve seat is not necessarily exactly the same, in order to ensure that all press-fitted valves have the same press-fit accuracy, the sleeve condition between the valve body and the valve seat before each press fitting can be obtained based on the image captured by the press-fit trigger, and the target movement distance of the displacement sensor can be adjusted based on this, that is, the degree of downward pressure of the lower press is adaptively adjusted, and ultimately all press-fitted valves have the same press-fit accuracy.

[0016] Preferably, the upper surface of the positioning tooling at the press-fitting station is provided with a positioning groove, and the valve body and valve seat are inserted into the positioning groove; the positioning tooling is provided with a pushing assembly for driving the valve body and valve seat to separate from the positioning tooling.

[0017] By adopting the above technical solution, after the valve body and valve seat are press-fitted by the lower press machine, the push assembly is used to push the press-fitted valve body out of the positioning groove, so as to facilitate the increase of the valve body feeding speed and improve the batch press-fitting efficiency of the valve body.

[0018] Preferably, the pushing assembly includes a pushing rod and a convex strip, the pushing rod is slidably connected in the positioning tooling, and the sliding direction of the pushing rod is parallel to the depth direction of the positioning groove, the convex strip is located on the moving path of the lower end of the pushing rod when the turntable rotates, when the pushing rod is not in contact with the convex strip, the top of the pushing rod is not higher than the top wall of the positioning tooling near the notch of the positioning groove, and is used to contact the valve body; when the pushing rod is in contact with the convex strip, the convex strip is used to drive the pushing rod to move upward and penetrate the top wall of the positioning tooling during the pushing rod moving with the rotation of the turntable, so that the pushing rod drives the valve body to move upward.

[0019] By adopting the above technical solution, the rotation of the turntable is used to drive the lower end of the push rod to contact the convex strip, and the convex strip is used to squeeze the push rod so that the push rod moves up and penetrates the top wall of the positioning tooling, thereby causing the push rod to move up and drive the valve body to separate from the positioning tooling to achieve discharge.

[0020] Preferably, a plurality of sub-boards are slidably connected in the positioning grooves of each positioning tooling. A yielding surface is provided on one side wall of the sub-board facing the ejector rod and on the side wall of the ejector rod. The yielding surface is used to push the sub-board during the downward movement of the ejector rod, so that all the sub-boards in the same positioning groove approach each other until they enclose to form an annular plate, and the annular plate is used to fit with the peripheral wall of the valve body. A return spring is commonly connected between the bottom wall of each sub-board and the inner wall of the positioning groove. The telescopic direction of the return spring is parallel to the sliding direction of the corresponding sub-board. And when the return spring is not deformed, the ejector rod moves upward to a position passing through the top wall of the positioning tooling, and at this time, all the sub-boards in the same positioning groove do not contact each other. A reset member is further included, and the reset member is used to drive the ejector rod to move downward.

[0021] By adopting the above technical solution, the convex strip drives the ejector rod to move upward through the top wall of the positioning tooling. At this time, the sub-boards will move away from each other under the elastic force of the return spring to disengage from the contact with the valve body, reducing the resistance when the valve body disengages from the positioning groove. After the valve body disengages from the positioning tooling, the reset member drives the ejector rod to move downward for reset. And during the downward movement of the ejector rod, the sub-boards will move closer to each other under the action of the yielding surface and fit together to form an annular plate. At this time, the return spring is in a contracted state, and the subsequent valve body to be pressed will be inserted into the inner ring of the annular plate and fit with the annular plate to realize the positioning of the valve body during the pressing process through the annular plate, so that the push rod can be rotated to directly below the open end of the pressing cylinder.

[0022] Preferably, the reset member is a docking annular plate. The docking annular plate is concentric with the turntable, and an annular groove for inserting the lower end of the ejector rod is provided along the circumferential direction of the docking annular plate, and the convex strip is located in the annular groove.

[0023] By adopting the above technical solution, when the ejector rod is not in contact with the convex strip, the ejector rod is inserted into the annular groove and rotates circumferentially along the annular groove as the turntable rotates. At this time, the inner wall of the annular groove is used to limit the ejector rod, so that the ejector rod is completely inserted into the positioning tooling. And when the ejector rod rotates to be in contact with the convex strip, the convex strip is used to push the ejector rod, so that the ejector rod moves upward through the positioning tooling.

[0024] Preferably, a gap is reserved between the test push rod and the inner wall of the pressing cylinder. A purging member is provided in the pressing cylinder, and the purging member is used to blow gas into the gap to dredge the gap.

[0025] By adopting the above technical solution, the setting of the gap can reduce the resistance caused by the inner wall of the pressing cylinder to the sliding process of the test push rod. The setting of the purging member can realize the dredging of the gap and reduce the blockage of the gap by dust, thereby affecting the smoothness of the sliding of the test push rod.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The precise control of the movement of the lower press is achieved through a displacement sensor and a controller. Since the lower press can move in a direction close to or away from the press-fitting station, when the lower press moves in a direction close to the press-fitting station, the press-fitting of the valve body can be achieved. The moving distance of the corresponding displacement sensor can be used to characterize the press-fitting force of the lower press on the valve, thereby improving the press-fitting accuracy and reducing the scrap rate of workpieces.

[0028] 2. The setting of the turntable enables continuous press-fitting processing of a batch of valve bodies. And through the press-fitting trigger, it automatically detects whether a positioning tooling with a valve body moves below the lower press, so as to realize the batch automatic press-fitting processing of the valve body and improve the processing efficiency. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of a press-fitting device for valves disclosed in an embodiment of the present application.

[0030] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0031] Figure 3 is Figure 2 an enlarged schematic view at B in

[0032] Figure 4 is Figure 2 an enlarged schematic view at C in

[0033] Figure 5 is a structural block diagram of a press-fitting device for valves disclosed in an embodiment of the present application.

[0034] Description of the Reference Numerals: 1, frame; 11, turntable; 12, rotating member; 13, loading area; 14, unloading area; 15, press-fitting area; 2, positioning tooling; 21, press-fitting station; 22, positioning groove; 23, dividing plate; 231, return spring; 232, relief surface; 3, lower press; 31, press-fitting cylinder; 32, lower cylinder; 33, test ejector rod; 34, first spring; 35, purging member; 4, valve body; 41, valve seat; 42, valve body; 43, push rod; 44, second spring; 5, controller; 51, displacement sensor; 52, press-fitting trigger; 6, pushing assembly; 61, push rod; 62, rib; 63, reset member; 631, annular groove. Detailed Description of the Embodiment

[0035] The following will further describe the present application in detail Figures 1-5 with reference to the attached

[0036] An embodiment of the present application discloses a press-fitting device for a valve. Refer to Figure 1 , the press-fitting device for the valve includes a frame 1, a turntable 11 is rotatably connected to the frame 1, and a rotating member 12 for driving the turntable 11 to rotate self is provided on the frame 1. The rotating member 12 may specifically be a motor. A plurality of positioning jigs 2 are evenly distributed along the circumferential direction on the upper surface of the turntable 11. A press-fitting station 21 is provided above the positioning jig 2 for placing the valve body 4. A feeding area 13, a press-fitting area 15 and a discharging area 14 are sequentially arranged on one side of the turntable 11 along the rotating direction of the turntable 11. Correspondingly, the feeding area 13 is used to place the valve body 4 at the press-fitting station 21, the press-fitting area 15 is used to press-fit the valve body 4, and the discharging area 14 is used to take out the valve body 4 that has completed the press-fitting. A down press 3 is provided at a position on the frame 1 close to the press-fitting area 15. The down press 3 is located above the turntable 11 and is used to press down to the positioning jig 2 when any positioning jig 2 on the turntable 11 rotates to below the down press 3.

[0037] Refer to Figure 2 and Figure 3 , a positioning groove 22 is provided on the surface of each positioning jig 2 at its press-fitting station 21 for inserting the valve body 4. The valve body 4 includes a valve seat 41, a valve body 42, a push rod 43 and a second spring 44. Among them, the valve seat 41 is inserted into the bottom of the positioning groove 22, the lower end of the valve body 42 is sleeved on the top of the valve seat 41, and the valve body 42 abuts against the valve seat 41. The push rod 43 and the second spring 44 are both inserted into the valve body 42 and are located above the valve seat 41. The second spring 44 is sleeved on the periphery of the push rod 43, and one end of the second spring 44 abuts against the push rod 43, and the other end abuts against the upper surface of the valve seat 41. The valve seat 41 and the push rod 43 do not directly contact.

[0038] Refer to Figure 2 and Figure 4 , the down press 3 includes a press-fitting cylinder 31, a down press cylinder 32, a test ejector rod 33 and a first spring 34. The press-fitting cylinder 31 is installed on the frame 1, and the driving end of the press-fitting cylinder 31 is vertically downward and connected to the down press cylinder 32. The lower end of the down press cylinder 32 is open and faces the surface of the turntable 11. The test ejector rod 33 and the first spring 34 are both inserted into the down press cylinder 32, and one end of the first spring 34 is connected to the inner wall of the down press cylinder 32, and the other end is connected to the inner wall of the test ejector rod 33. The length direction of the test ejector rod 33, the telescopic direction of the first spring 34 and the telescopic direction of the driving end of the press-fitting cylinder 31 are arranged in parallel. When the first spring 34 is not deformed, the lower end of the test ejector rod 33 penetrates through the open end of the down press cylinder 32 and extends out of the down press cylinder 32. In other embodiments, the press-fitting cylinder 31 can be replaced with a combined structure of a motor and a lead screw. By threadedly sleeving the down press cylinder 32 on the lead screw, the up and down movement of the down press cylinder 32 along the vertical direction can be realized by using the combined structure of the motor and the lead screw.

[0039] There is also a gap reserved between the inner wall of the lower pressing cylinder 32 and the test ejector rod 33. A purging member 35 is provided at the top of the lower pressing cylinder 32. The purging member 35 may specifically include an air pump and an air pipe connected to the air outlet of the air pump. The air pipe nozzle faces the gap for dredging the gap.

[0040] Referring to Figure 2 and Figure 5 , a displacement sensor 51 is arranged in the lower pressing cylinder 32. The displacement sensor 51 can slide relative to the lower pressing cylinder 32 along the height direction of the lower pressing cylinder 32. The detection end of the displacement sensor 51 is inserted inside the first spring 34. The displacement sensor 51 is arranged on the moving path when the test ejector rod 33 moves towards the inside of the lower pressing cylinder 32. The displacement sensor 51 is electrically connected to a controller 5. The rotating member 12 and the pressing cylinder 31 are both controlled by the controller 5. The controller 5 can be a PLC controller.

[0041] Referring to Figure 3 , Figure 4 , and Figure 5 , the controller 5 is used to drive the rotating member 12 to drive the turntable 11 to rotate, so that any positioning tooling 2 with a valve body 4 is placed below the press 3. Then, the controller 5 controls the pressing cylinder 31 to drive the lower pressing cylinder 32 to move downward and make the lower end cylinder wall of the lower pressing cylinder 32 contact the top wall of the valve body 42. At this time, the end of the test ejector rod 33 exposed outside the lower pressing cylinder 32 is inserted into Figure 3 the top of the valve body 42 shown in Figure 4 and contacts the top of the push rod 43. At this time, the first spring 34 is not deformed. Then, the controller 5 controls the pressing cylinder 31 to drive the lower pressing cylinder 32 to continue to move downward, so that the lower end of the valve body 42 further moves downward relative to the valve seat 41 (i.e., the state shown in

[0042] Referring to Figure 4 and Figure 5 , the controller 5 is also electrically connected to a press-fitting trigger 52. The press-fitting trigger 52 is installed on the frame 1, and the detection end faces the surface of the turntable 11 below the press 3. The press-fitting trigger 52 includes a material detector and a camera. The material detector may specifically be a ranging sensor or an ultrasonic sensor for detecting whether the positioning tooling 2 rotated to below the press 3 carries a valve body 4. The camera is used to take an image of the surface of the turntable 11 directly below the press 3. And when any positioning tooling 2 on the turntable 11 moves to below the press 3, this positioning tooling 2 is within the shooting range of the camera.

[0043] The controller 5 can control the rotation by a specified angle every specified duration. The specified duration can be considered as the duration used by the down press 3 for press-fitting a single valve body 4. The specified angle can be considered as the rotation angle of the turntable 11 when adjacent positioning jigs 2 on the turntable 11 are respectively rotated to the lower part of the down press 3. Whenever the turntable 11 stops rotating, the controller 5 is further configured to obtain the image captured by the camera, determine the actual position of the valve body 4 in the image, compare the actual position with the preset reference position. Specifically, the image can be gridified and a two-dimensional coordinate system can be established to represent the actual position and the reference position in the form of coordinates and then compared. If the actual position is consistent with the reference position, the controller 5 controls the down press 3 to start and press-fit the valve body 4. If they are inconsistent, the deviation value between the actual position and the reference position is calculated. The deviation value can be considered as the deviation value of the horizontal and vertical coordinates in the two-dimensional coordinate system. Then, based on the pre-stored first correspondence table, the correction angle corresponding to the deviation value is searched, and then the turntable 11 is controlled to rotate by an angle consistent with the correction angle in the original rotation direction (such as the counterclockwise direction in this application) and then stop, so that the push rod 43 of the valve body 4 is located directly below the open end at the lower end of the down cylinder 32. Among them, the first correspondence table stores different deviation values and their corresponding correction angles.

[0044] The controller 5 is further configured to, when obtaining the above-mentioned image, determine the distance value between the valve body 4 in the image and the top of the positioning jig 2, compare the distance value with the preset distance and calculate the difference value, then determine the target moving distance corresponding to the difference value according to the pre-stored second correspondence table, and then control the down press 3 to move down to press-fit the valve body 4. And when the moving distance detected by the displacement sensor 51 reaches the target moving distance, the controller 5 controls the down press 3 to move up and reset. Among them, the second correspondence table stores different difference values and their corresponding target moving distances.

[0045] Refer to Figure 2 、 Figure 3 and Figure 4, also includes a pushing assembly 6 and a reset member 63, the pushing assembly 6 includes a pushing rod 61 and a convex strip 62, the reset member 63 is provided on the frame 1, and is a docking ring plate provided coaxially with the turntable 11; the pushing rod 61 is provided in a one-to-one correspondence with the positioning fixture 2, and the pushing rod 61 is slidably connected to the corresponding positioning fixture 2 in the vertical direction, and the inner wall of the docking ring plate is provided with an annular groove 631 along its circumference, and the end of the pushing rod 61 away from the positioning fixture 2 is inserted into the annular groove 631, and the convex strip 62 is integrally formed on the inner wall of the annular groove 631, and the convex strip 62 is located between the press-fit area 15 and the blanking area 14. When the pushing rod 61 is not in contact with the convex strip 62 When the push rod 61 moves in the contact annular groove 631, the other end of the push rod 61 is inserted into the positioning tool 2, and its top wall is flush with the top wall of the positioning tool 2, and is used to contact the valve body 42; when the push rod 61 moves with the rotation of the turntable 11 and contacts the ridge 62, it will move upward relative to the positioning tool 2 on the guide of the ridge 62, and pass through the top of the positioning tool 2, so that the corresponding valve body 42 is pushed upward by the push rod 61, and when the push rod 61 contacts the top of the ridge 62, the corresponding positioning tool 2 is just rotated to the unloading area 14, and at this time the valve body 4 is completely separated from the positioning groove 22 by the push rod 61.

[0046] Reference Figure 3 and Figure 4 , a plurality of split plates 23 are slidably connected in the positioning groove 22 of each positioning tool 2, and a return spring 231 is commonly connected between the split plate 23 and the inner wall of the positioning groove 22, and the expansion and contraction direction of the return spring 231 is parallel to the sliding direction of the split plate 23, and the side wall of the push rod 61 and the side wall of the split plate 23 facing the push rod 61 are provided with a relief surface 232, so that the push rod 61 and the split plate 23 abut against each other; when the push rod 61 is inserted into the positioning tool 2, and the top of the push rod 61 does not protrude from the upper surface of the positioning tool 2 When the push rod 61 moves upward and penetrates the top of the positioning tool 2, the split plates 23 are driven by the reset spring 231 to move in a direction away from the valve body 42 to break away from the contact with the valve body 42, thereby reducing the resistance of the valve body 4 when it leaves the gap.

[0047] The implementation principle of a press-fitting device for a valve in an embodiment of this application is as follows: Manipulators can be installed in the loading area 13 and the unloading area 14 respectively to pick and place the valve body 4 on the positioning tooling 2. The turntable 11 is driven to rotate by the controller 5 so that the valve body 4 moves sequentially from the loading area 13 to the press-fitting area 15 for press-fitting and then moves from the press-fitting area 15 to the unloading area 14. During this process, the actual position of the valve body 4 in the press-fitting area 15 is detected by the press-fitting trigger 52, and it is corrected by the controller 5 so that the push rod 43 of the valve body 4 is directly below the open end at the lower end of the lower pressing cylinder 32. After the correction is completed, the controller 5 controls the lower press 3 to move downward to press-fit the valve body 42 and the valve seat 41. Moreover, the image of the valve body 4 taken by the press-fitting trigger 52 can be used to determine the target moving distance. The controller 5 is used to control the upper movement and reset of the lower press 3 when the moving distance detected by the displacement sensor 51 reaches the target moving distance, completing the press-fitting to achieve precise control of the press-fitting progress between the valve body 42 and the valve seat 41.

[0048] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A press-fitting device for a valve, characterized in that: It includes a positioning tooling (2), and a press-fitting station (21) for placing the valve body (4) is provided on the upper surface of the positioning tooling (2); a down press (3) is arranged above the positioning tooling (2), and the down press (3) is used to move in a direction close to or away from the press-fitting station (21); it also includes a displacement sensor (51) and a controller (5), and the displacement sensor (51) is electrically connected to the controller (5) to detect the downward movement distance of the down press (3) relative to the press-fitting station (21), and the controller (5) is used to control the movement of the down press (3) in a direction close to or away from the press-fitting station (21) according to the detection result of the displacement sensor (51). The down press (3) includes a press-fitting cylinder (31), a down cylinder (32), a test ejector rod (33) and a first spring (34); the driving end of the press-fitting cylinder is connected to the down cylinder (32), the press-fitting station (21) is located on the moving path of the down cylinder (32) when it moves with the driving end of the press-fitting cylinder, and one end of the down cylinder (32) facing the press-fitting tooling is open; the test ejector rod (33) and the first spring (34) are inserted into the down cylinder (32), the first spring (34) is sleeved outside the test ejector rod (33), and the first spring (34) is connected between the test ejector rod (33) and the inner wall of the down cylinder (32). When the first spring (34) is not deformed, the bottom of the test ejector rod (33) is located outside the down cylinder (32); the displacement sensor (51) is used to detect the moving distance of the test ejector rod (33) relative to the down cylinder (32). The valve body (4) includes a valve seat (41), a valve body (42) sleeved on the top of the valve seat (41), a push rod (43) inserted into the valve body (42) and a second spring (44); the first spring (34) is sleeved on the push rod (43), and one end of the first spring (34) abuts against the valve seat (41), and the other end abuts against the push rod (43); the bottom end wall of the down cylinder (32) is used to contact the top wall of the valve body (42) of the valve body (4). It also includes a turntable (11) and a rotating member (12) for driving the turntable (11) to rotate. There are several positioning toolings (2), which are distributed on the surface of the turntable (11) along the rotation center of the turntable (11). Any positioning tooling (2) can rotate to the lower part of the down press (3) with the rotation of the turntable (11) so that the corresponding press-fitting station (21) is located on the moving path of the down press (3); it also includes a press-fitting trigger (52), and the press-fitting trigger (52) is electrically connected to the controller (5) to detect whether there is a positioning tooling (2) with a valve body (4) on the moving path of the down press (3). The controller (5) is used to control the opening and closing of the down press (3) and the displacement sensor (51) based on the detection result of the press-fitting trigger (52). The upper surface of the positioning fixture (2) located at the press-fitting station (21) is provided with a positioning groove (22), and the valve body (42) and the valve seat (41) are inserted into the positioning groove (22); the positioning fixture (2) is provided with a push assembly (6) for driving the valve body (42) and the valve seat (41) to separate from the positioning fixture (2); The pushing assembly (6) includes a pushing rod (61) and a convex strip (62), the pushing rod (61) is slidably connected to the positioning tool (2), and the sliding direction of the pushing rod (61) is parallel to the depth direction of the positioning groove (22), and the convex strip (62) is located on the moving path of the lower end of the pushing rod (61) when the turntable (11) rotates. When the pushing rod (61) does not contact the convex strip (62), the top of the pushing rod (61) is not higher than the top wall of the positioning tool (2) near the notch of the positioning groove (22), and is used to contact the valve body (42); when the pushing rod (61) contacts the convex strip (62), the convex strip (62) is used to drive the pushing rod (61) to move upward and pass through the top wall of the positioning tool (2) during the movement of the pushing rod (61) with the rotation of the turntable (11), so that the pushing rod (61) drives the valve body (42) to move upward.

2. The press-fitting device for a valve according to claim 1, characterized in that: The press-fit trigger (52) is located on one side below the lower press (3) to capture an image of the positioning fixture (2) rotated to the bottom of the lower press (3); the controller (5) is used to obtain the image, determine the actual position of the valve body (4) in the image, and compare the actual position with a preset reference position. If the comparison is inconsistent, the deviation value between the actual position and the reference position is calculated, the correction angle is calculated, and the turntable (11) is controlled to rotate to an angle consistent with the correction angle and then stop, so that the actual position is consistent with the reference position. When the position of the valve body (4) in the image of the positioning fixture (2) below the lower press (3) is the reference position in the image, the push rod (43) of the corresponding valve body (4) is located directly below the lower end opening of the lower press cylinder (32).

3. The press-fitting device for a valve according to claim 2, characterized in that: The controller (5) is further configured to determine the distance between the top of the valve body (4) and the top of the positioning tool (2) after acquiring the image, compare the distance with a preset distance and calculate a difference, and determine a target moving distance based on the difference. The controller (5) is configured to control the lower pressing machine (3) to move upward and reset when the moving distance of the relevant test push rod (33) relative to the lower pressing cylinder (32) detected by the displacement sensor (51) reaches the target moving distance.

4. The press-fitting device for a valve according to claim 1, wherein: A plurality of sub-boards (23) are slidably connected in the positioning grooves (22) of each positioning tooling (2). A yielding surface (232) is provided on one side wall of the sub-board (23) facing the top push rod (61) and on the side wall of the top push rod (61). The yielding surface (232) is used to push the sub-board (23) during the downward movement of the top push rod (61), so that all the sub-boards (23) in the same positioning groove (22) approach each other until they enclose to form an annular plate, and the annular plate is used to fit against the peripheral wall of the valve body (4); A return spring (231) is commonly connected between the bottom wall of each sub-board (23) and the inner wall of the positioning groove (22). The telescopic direction of the return spring (231) is parallel to the sliding direction of the corresponding sub-board (23); And when the return spring (231) is not deformed, the top push rod (61) moves upward to a position passing through the top wall of the positioning tooling (2), and at this time, all the sub-boards (23) in the same positioning groove (22) do not contact each other; A reset member (63) is further included, and the reset member (63) is used to drive the top push rod (61) to move downward.

5. The press-fitting device for a valve according to claim 4, characterized in that: The reset member (63) is a docking annular plate. The docking annular plate is concentric with the turntable (11), and an annular groove (631) for inserting the lower end of the top push rod (61) is provided along the circumferential direction of the docking annular plate. The convex strip (62) is located in the annular groove (631).

6. The press-fitting device for a valve according to claim 1, characterized in that: A gap is reserved between the test top rod (33) and the inner wall of the downward pressing cylinder (32). A purging member (35) is provided in the downward pressing cylinder (32), and the purging member (35) is used to blow gas into the gap to dredge the gap.

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