A screw rod and valve core assembly tool

Abstract

The utility model relates to the technical fields of stop valve production more specifically, relate to a screw rod and valve core assembly frock, including placing platform and vibration mechanism, vibration mechanism is connected with the placing platform, is provided with a plurality of installation parts for accommodating the valve core and a plurality of fixing parts for fixing the valve core on the placing platform. The utility model can effectively avoid that the pre-tightening force of screw rod and valve core threaded connection is too big. Improve the reliability of product use.

Description

Technical Field

[0001] This utility model relates to the technical field of gate valve production, and more specifically, to a tooling for assembling a lead screw and valve core. Background Technology

[0002] PPR gate valves, as crucial components in fluid control, typically consist of a PPR valve body, stainless steel inserts, a valve cover, a valve core, and a lead screw. During assembly, the threaded connection between the lead screw and the valve core is a core process. Traditionally, this is done manually by screwing the lead screw assembly onto the valve core. However, with the diversification of product specifications and the increase in lead screw length and number of turns, the efficiency of manual operation significantly decreases, and assembly quality becomes inconsistent. Due to variations in the force applied by the operator, the screw insertion depth often differs, resulting in significant deviations in the height of the exposed section. This problem is particularly prominent in subsequent automated assembly stages, as an excessively high exposed lead screw can interfere with the rotating fixtures of automated assembly equipment, severely impacting production cycle time.

[0003] The existing improvement solution uses a pneumatic wrench (commonly known as an air wrench) to manually force the lead screw fully into the valve core to maintain a consistent screw insertion depth. While this solves the consistency problem in automated assembly, it introduces new technical drawbacks. Pneumatic wrenches have a large instantaneous output torque that is difficult to control precisely, easily generating excessive preload when assembling small, precision threaded gate valves. This abnormal load can cause irreversible plastic deformation of the meshing thread surface between the lead screw and the valve core, resulting in micro-cracks and other damage defects at the microscopic level. More seriously, excessive contact stress may cause abnormal friction between the threaded metal parts, producing an interface adhesion effect similar to cold welding, causing thread jamming or even complete seizing. For gate valves that require frequent opening and closing operations, this directly leads to valve malfunction and significantly reduces product reliability. Utility Model Content

[0004] The purpose of this invention is to overcome the problem that the existing method of assembling the valve screw and valve core using a pneumatic wrench cannot avoid excessive preload in the threaded connection between the screw and valve core, and to provide a tooling for assembling the screw and valve core.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A tooling for assembling a lead screw and a valve core is provided, including a placement platform and a vibration mechanism. The vibration mechanism is connected to the placement platform, and the placement platform is provided with a plurality of mounting parts for accommodating the valve core and a plurality of fixing parts for fixing the valve core.

[0007] In the above scheme, the lead screw is first screwed into the valve core's internal thread one turn, and then the valve core is placed on the mounting part of the placement platform. The fixing part fixes the valve core circumferentially by mechanical clamping or elastic pressing, completely restricting its rotational freedom. The vibration mechanism is linked to the placement platform through a rigid connection or transmission component. It can apply mechanical vibration with a specific frequency and amplitude to the placement platform, causing the platform to generate periodic micro-vibrations. When the energy is transferred to the lead screw, it will decompose into a small rotational torque component in the direction of the lead screw axis. This torque causes the lead screw to generate a progressive rotational motion during vibration. Utilizing the self-guiding characteristics of the threaded pair, the lead screw is automatically screwed into the valve core's internal thread. The limiting convex ring at the top of the lead screw abuts against the top end face of the valve core, and the vibration energy can no longer drive the lead screw to rotate. The system reaches a dynamic equilibrium state of vibration. During the assembly process of the entire device, the vibration mechanism only applies a periodic small torque to the lead screw. When the lead screw is fully screwed into the valve core, the axial clearance of the threaded pair is still maintained at a relatively large value. The preload between the valve core's internal thread and the lead screw is almost zero, and the height of the lead screw can also be kept consistent. This effectively avoids plastic deformation or cold welding effect on the meshing thread surface caused by instantaneous preload overload.

[0008] Furthermore, the placement platform includes a fixed limiting plate and a placement positioning plate. One end of the placement positioning plate is fixedly connected to the fixed limiting plate, and the other end is connected to the vibration mechanism. The mounting part is located on the placement positioning plate, and the fixing part is located on the fixed limiting plate. The fixing method of the fixing part can be mechanical clamping or elastic compression. The placement positioning plate is used to position and install the valve core, while the fixed limiting plate is used to mechanically clamp the valve core.

[0009] Furthermore, the mounting part includes a placement groove, and the fixing part includes a placement through hole and a fixing hole. The fixing hole communicates with the placement through hole, and both the fixing hole and the placement through hole are connected to the placement groove. Specifically, the mounting part is in the form of a groove, and the disc-shaped bottom of the valve core is placed directly on the groove. Specifically, the fixing part is in the form of two interconnected holes. The valve core slides on the placement groove and can slide back and forth between the placement through hole and the fixing hole to achieve fixing and unfixing.

[0010] Furthermore, the distance from the lower surface of the fixed limiting plate to the bottom surface of the placement groove is equal to the thickness of the disc-shaped bottom of the valve core, and the width of the placement groove and the diameter of the placement through hole are at least greater than the diameter of the disc-shaped bottom of the valve core; the disc-shaped bottom of the valve core slides into the placement groove position below the fixed hole, and the lower surface of the fixed limiting plate and the bottom surface of the placement groove abut against the upper and lower surfaces of the disc-shaped bottom of the valve core, restricting its up and down shaking.

[0011] Furthermore, the inner side of the fixing hole is in contact with the rod-shaped top of the valve core, and the length of the placement groove is at least 1.5 times the radius of the placement through hole. The fixing hole needs to mechanically clamp the valve core and restrict its rotational freedom. The fixing hole needs to meet two conditions. First, when the disc-shaped bottom of the valve core slides on the placement groove, the rod-shaped top needs to be able to slide normally into the fixing part. This requires the valve core to have sufficient sliding stroke on the placement groove. The minimum stroke range is 1.5 times the radius of the placement through hole. Second, the fixing hole must contact the outer contour of the rod-shaped top of the valve core to form a mechanical clamp. Therefore, the inner side of the fixing hole needs to be in contact with the rod-shaped top of the valve core.

[0012] Furthermore, the length of the fixing hole is at least greater than half of the maximum outer diameter of the rod-shaped top of the valve stem; the inner wall of the fixing hole needs to form a stable clamping with the rod-shaped top of the valve core, and the length of the fixing hole cannot be too small, otherwise the contact area between the two is insufficient and the restraining effect is not good. The fixing hole must fit at least half of the rod-shaped top of the valve core in order to form a stable mechanical clamping.

[0013] Furthermore, the mounting parts and the fixing parts are arranged in a straight line or in a circular pattern on the placement platform; the placement platform can be modularly expanded to increase the number of mounting parts, and with the synchronous drive of the vibration mechanism, multi-station parallel assembly can be realized to improve assembly efficiency.

[0014] Furthermore, the vibration mechanism includes a vibration base, an elastic element, and a vibration plate. One end of the vibration plate is connected to the placement positioning plate, and the other end is connected to the vibration base through the elastic element. The vibration plate and the vibration base are elastically connected, and the vibration plate can reciprocate within a certain range relative to the vibration base.

[0015] Furthermore, the vibration mechanism also includes an electromagnet and an armature. The armature is installed at the bottom of the vibratory plate, and the electromagnet is installed in the cavity of the vibration base. The armature and the electromagnet are arranged opposite to each other. An alternating current is passed through the coil of the electromagnet, which generates magnetism and produces a periodic magnetic force to attract the armature, thereby forming vibration.

[0016] Furthermore, the bottom of the vibration base is also provided with a shock-absorbing pad, which can reduce the amplitude of the vibration transmitted to the outside by the vibration mechanism and reduce the impact on other automated equipment in the workshop.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The vibration mechanism is connected to the placement platform, which has several mounting parts and several fixing parts. The fixing parts are connected to the mounting parts. The fixing parts fix the valve core circumferentially by mechanical clamping or elastic pressing. The vibration mechanism applies mechanical vibration to the placement platform. The vibration mode disperses the assembly torque into continuous small load cycles, so that the threaded pair gradually completes the engagement within the elastic deformation range. When the lead screw is fully screwed into the valve core, the preload between the valve core internal thread and the lead screw is almost zero, which effectively avoids plastic deformation or cold welding effect caused by instantaneous overload and improves the reliability of the product.

[0019] 2. The mounting and fixing parts are arranged in a straight line or in a circular pattern on the placement platform; the placement platform can greatly expand the number of mounting parts, and with the synchronous drive of the vibration mechanism, multi-station parallel assembly can be realized, improving assembly efficiency. Attached Figure Description

[0020] Figure 1 A three-dimensional view of a tooling for assembling a lead screw and a valve core;

[0021] Figure 2 A schematic diagram of the installation of elastic components in a tooling assembly fixture for a lead screw and valve core;

[0022] Figure 3 A schematic diagram of the internal structure of a lead screw and valve core assembly tooling;

[0023] Figure 4 An exploded view of a platform for assembling a lead screw and valve core.

[0024] Figure 5 A plan view of the layout of the mounting and fixing parts of a lead screw and valve core assembly fixture on a placement platform;

[0025] Figure 6 This is a schematic diagram of the valve core structure of a tooling for assembling a lead screw and valve core.

[0026] In the attached diagram: 100, placement platform; 110, fixed limiting plate; 120, placement positioning plate; 130, mounting part; 131, placement groove; 140, fixing part; 141, placement through hole; 142, fixing hole; 200, vibration mechanism; 210, vibration base; 220, elastic element; 230, vibrating plate; 240, electromagnet; 250, armature; 260, shock absorber; 300, valve core. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] Example 1

[0030] This embodiment is a first embodiment of a tooling for assembling a lead screw and a valve core, such as... Figure 1 and 5 As shown, it includes a placement platform 100 and a vibration mechanism 200. The vibration mechanism 200 is connected to the placement platform 100. The placement platform 100 is provided with a plurality of mounting parts 130 for accommodating the valve core 300 and a plurality of fixing parts 140 for fixing the valve core 300.

[0031] Specifically, several mounting parts 130 and several fixing parts 140 are arranged in a straight line or in a circular pattern on the placement platform 100; the placement platform 100 can be modularly expanded to increase the number of mounting parts 130, and with the synchronous drive of the vibration mechanism 200, multi-station parallel assembly can be achieved, thereby improving assembly efficiency.

[0032] The working principle of the lead screw and valve core assembly fixture in this embodiment is as follows:

[0033] The shape of valve core 300 is as follows Figure 6As shown, the valve core 300 is a component described in the prior art. First, the lead screw is screwed into the internal thread of the valve core 300 one turn. Then, the valve core 300 is placed on the mounting portion 130 of the placement platform 100. The fixing portion 140 circumferentially fixes the valve core 300, completely restricting its rotational freedom. The vibration mechanism 200 is linked with the placement platform 100, applying mechanical vibration of a specific frequency and amplitude to the placement platform 100, causing the placement platform 100 to produce periodic micro-amplitude vibrations. When the vibration energy is transmitted to the lead screw, it decomposes into a small rotational torque component in the direction of the lead screw axis. This torque causes the lead screw to produce a progressive rotational motion during vibration. Under the self-guiding characteristics of the threaded pair, the lead screw automatically screws into the internal thread of the valve core 300. A limiting protrusion ring is located at the top of the lead screw. When the lead screw is fully screwed into the valve core 300, the limiting protrusion ring contacts the top end face of the valve core 300, preventing the vibration energy from continuing to drive the lead screw to rotate.

[0034] The beneficial effects of this embodiment are: vibration disperses the assembly torque into continuous small load cycles, causing the lead screw to gradually engage into the valve core 300. When the lead screw is fully engaged into the valve core 300, the preload between the internal thread of the valve core 300 and the lead screw is almost zero, effectively avoiding plastic deformation or cold welding effect caused by instantaneous overload. The height of the lead screw can also be kept consistent and at a low height. When the workpiece is subsequently assembled in batches using automated assembly, the rotating fixture of the automated assembly equipment will not interfere with the movement of the top of the lead screw.

[0035] Example 2

[0036] This embodiment is a second embodiment of a tooling for assembling a lead screw and a valve core, such as... Figure 4 and 6 As shown, the difference from Embodiment 1 is as follows:

[0037] Specifically, the placement platform 100 includes a fixed limiting plate 110 and a placement positioning plate 120. One end of the placement positioning plate 120 is fixedly connected to the fixed limiting plate 110, and the other end is connected to the vibration mechanism 200. The mounting part 130 is located on the placement positioning plate 120, and the fixing part 140 is located on the fixed limiting plate 110. The fixing method of the fixing part 140 can be mechanical clamping or elastic pressing. The placement positioning plate 120 is used to position and install the valve core 300, while the fixed limiting plate 110 is used to mechanically clamp the valve core 300.

[0038] Specifically, the mounting part 130 includes a placement groove 131, and the fixing part 140 includes a placement through hole 141 and a fixing hole 142. The fixing hole 142 communicates with the placement through hole 141, and both the fixing hole 142 and the placement through hole 141 are connected to the placement groove 131. The mounting part 130 is specifically in the form of a groove, and the disc-shaped bottom of the valve core 300 is placed directly on the groove. The fixing part 140 is specifically in the form of two interconnected holes. The valve core 300 slides on the placement groove 131, and the valve core 300 can slide back and forth between the placement through hole 141 and the fixing hole 142 to achieve fixing and unfixing.

[0039] Specifically, the distance from the lower surface of the fixed limiting plate 110 to the bottom surface of the placement groove 131 is equal to the thickness of the disc-shaped bottom of the valve core 300. The width of the placement groove 131 and the diameter of the placement through hole 141 are at least greater than the diameter of the disc-shaped bottom of the valve core 300. The disc-shaped bottom of the valve core 300 slides into the placement groove 131 below the fixed hole 142. The lower surface of the fixed limiting plate 110 and the bottom surface of the placement groove 131 abut against the upper and lower surfaces of the disc-shaped bottom of the valve core 300, limiting its up-and-down shaking.

[0040] Specifically, the inner side of the fixing hole 142 is in contact with the rod-shaped top of the valve core 300, and the length of the placement groove 131 is at least 1.5 times the radius of the placement through hole 141. The fixing hole 142 needs to mechanically clamp the valve core 300 to restrict its rotational freedom. The fixing hole 142 needs to meet two conditions. First, when the disc-shaped bottom of the valve core 300 slides on the placement groove 131, the rod-shaped top needs to be able to slide normally into the fixing part 140. This requires the valve core 300 to have sufficient sliding stroke on the placement groove 131. The minimum stroke range is 1.5 times the radius of the placement through hole 141. Second, the fixing hole 142 must contact the outer contour of the rod-shaped top of the valve core 300 to form a mechanical clamp. Therefore, the inner side of the fixing hole 142 needs to be in contact with the rod-shaped top of the valve core 300.

[0041] Specifically, the length of the fixing hole 142 is at least greater than half of the maximum outer diameter of the rod-shaped top of the valve stem; the inner wall of the fixing hole 142 needs to form a stable clamping with the rod-shaped top of the valve core 300, and the length of the fixing hole 142 cannot be too small, otherwise the contact area between the two is insufficient and the restraining effect is not good. The fixing hole 142 must fit at least half of the rod-shaped top of the valve core 300 in order to form a stable mechanical clamping.

[0042] The working principle of the lead screw and valve core assembly fixture in this embodiment is as follows:

[0043] When the valve core 300 is installed and fixed, the valve core 300 is placed on the placement groove 131 and pushed towards the fixing hole 142, so that the valve core 300 slides on the placement groove 131. The rod-shaped top of the valve core 300 enters the fixing hole 142 and fits against the inner wall of the fixing hole 142. Then the vibration mechanism 200 is activated, and the vibration of the vibration mechanism 200 is transmitted to the placement platform 100. The bottom surface of the placement groove 131 and the lower surface of the fixing limit plate 110 clamp the disc-shaped bottom of the valve core 300, preventing it from shaking up and down. The fixing groove clamps the rod-shaped top of the valve core 300, preventing it from rotating in the plane.

[0044] The beneficial effects of this embodiment are: by using the mechanical clamping method of placing the positioning plate 120 and the fixed limiting plate 110, multiple assembly points of valve cores 300 can be arranged in batches on the placement platform 100 at a lower cost, so as to realize multi-station parallel assembly and improve assembly efficiency.

[0045] Example 3

[0046] This embodiment is a third embodiment of a lead screw and valve core assembly fixture, such as... Figure 2 and 3 As shown, the difference from Embodiment 1 is as follows:

[0047] Specifically, the vibration mechanism 200 includes a vibration base 210, an elastic element 220, and a vibration plate 230. One end of the vibration plate 230 is connected to the positioning plate 120, and the other end is connected to the vibration base 210 through the elastic element 220. The vibration plate 230 and the vibration base 210 are elastically connected, and the vibration plate 230 can reciprocate relative to the vibration base 210 within a certain range.

[0048] Specifically, the vibration mechanism 200 also includes an electromagnet 240 and an armature 250. The armature 250 is installed at the bottom of the vibrating plate 230, and the electromagnet 240 is installed in the cavity of the vibration base 210. The armature 250 and the electromagnet 240 are arranged opposite to each other. An alternating current is passed through the coil of the electromagnet 240, which generates magnetism and produces a periodic magnetic force to attract the armature 250, thereby forming vibration.

[0049] Specifically, the bottom of the vibration base 210 is also provided with a shock-absorbing pad 260, which can reduce the amplitude of the vibration transmitted from the vibration mechanism 200 to the outside and reduce the impact on other automated equipment in the workshop.

[0050] The working principle of the lead screw and valve core assembly fixture in this embodiment is as follows:

[0051] When an alternating current is applied to the coil of the electromagnet 240, the electromagnet generates a magnetism. Under the action of the elastic element 220, the electromagnet 240 attracts and releases the armature 250 back and forth. The armature 250 drives the placement platform 100 to vibrate.

[0052] The beneficial effects of this embodiment are: compared with other vibration mechanisms such as cam vibration mechanisms, the electromagnetic vibration mechanism 200 is smaller in size and more suitable for assembling small workpieces.

[0053] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tooling for assembling a lead screw and a valve core, characterized in that, It includes a placement platform (100) and a vibration mechanism (200), the vibration mechanism (200) being connected to the placement platform (100), and the placement platform (100) being provided with a plurality of mounting portions (130) for accommodating valve cores (300) and a plurality of fixing portions (140) for fixing valve cores (300).

2. The tooling for assembling a lead screw and valve core according to claim 1, characterized in that, The placement platform (100) includes a fixed limiting plate (110) and a placement positioning plate (120). The upper surface of the placement positioning plate (120) is fixedly connected to the lower surface of the fixed limiting plate (110). The lower surface of the placement positioning plate (120) is connected to the vibration mechanism (200). The mounting part (130) is located on the placement positioning plate (120), and the fixing part (140) is located on the fixed limiting plate (110).

3. The tooling for assembling a lead screw and valve core according to claim 2, characterized in that, The mounting part (130) includes a placement groove (131), and the fixing part (140) includes a placement through hole (141) and a fixing hole (142). The fixing hole (142) communicates with the placement through hole (141), and both the fixing hole (142) and the placement through hole (141) are connected to the placement groove (131).

4. The tooling for assembling a lead screw and a valve core according to claim 3, characterized in that, The distance from the lower surface of the fixed limiting plate (110) to the bottom surface of the placement groove (131) is equal to the thickness of the disc-shaped bottom of the valve core (300). The width of the placement groove (131) and the diameter of the placement through hole (141) are at least greater than the diameter of the disc-shaped bottom of the valve core (300).

5. The tooling for assembling a lead screw and a valve core according to claim 4, characterized in that, The inner side of the fixing hole (142) is in contact with the rod-shaped top of the valve core (300), and the length of the placement groove (131) is at least 1.5 times the radius of the placement through hole (141).

6. The tooling for assembling a lead screw and a valve core according to claim 5, characterized in that, The length of the fixing hole (142) is at least greater than half the maximum outer diameter of the rod-shaped top of the valve stem.

7. The tooling for assembling a lead screw and a valve core according to claim 1, characterized in that, The mounting parts (130) and the fixing parts (140) are arranged in a straight line or in a circular pattern on the placement platform (100).

8. The tooling for assembling a lead screw and a valve core according to claim 2, characterized in that, The vibration mechanism (200) includes a vibration base (210), an elastic element (220) and a vibration plate (230). One end of the vibration plate (230) is connected to the placement positioning plate (120), and the other end is connected to the vibration base (210) through the elastic element (220).

9. The tooling for assembling a lead screw and a valve core according to claim 8, characterized in that, The vibration mechanism (200) further includes an electromagnet (240) and an armature (250). The armature (250) is installed at the bottom of the vibratory plate (230), and the electromagnet (240) is installed in the cavity of the vibration base (210). The armature (250) and the electromagnet (240) are arranged opposite to each other.

10. The tooling for assembling a lead screw and valve core according to claim 9, characterized in that, The bottom of the vibration base (210) is also provided with a shock-absorbing pad (260).

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