Anti-misplacement electronic cigarette composite heating mesh processing press bonding equipment

Abstract

This invention discloses a pressing device for processing composite heating mesh sheets for electronic cigarettes that prevents misalignment, belonging to the field of pressing processing technology for composite heating mesh sheets for electronic cigarettes. This pressing device includes a worktable and a lower heating fixture fixedly installed on the worktable. A column guide rod is fixed on the worktable, and a top plate is fixed to the top of the column guide rod. A drive cylinder is installed at the center of the top plate, and the output end of the drive cylinder is connected to an upper heating fixture. A positioning mold pool is fixed on the upper surface of the lower heating fixture along the central axis. Four positioning pins are provided near the four corners of the positioning mold pool. The composite heating mesh sheet processing material for electronic cigarettes is fitted onto the positioning pins. This pressing device can initially position the multi-layer composite material through the positioning pins. Before hot pressing, the positioning pins are tilted and moved to achieve stretching treatment of the multi-layer composite material, keeping it completely adhered to the device and improving the quality of the hot pressing process.

Description

Technical Field

[0001] This invention relates to the field of electronic cigarette composite heating mesh pressing technology, specifically to a pressing device for processing electronic cigarette composite heating mesh to prevent misalignment. Background Technology

[0002] The composite heating mesh of an electronic cigarette is the core heating component of the atomizing core. It is usually composed of a metal heating mesh, oil-guiding cotton, porous non-woven fabric, and other multi-layer materials. When powered on, it can evenly heat the e-liquid to achieve atomization. During its processing, the heating mesh and the oil-guiding layer need to be precisely aligned and hot-pressed together. The pressing quality directly affects the atomization efficiency and flavor consistency. Conventional pressing equipment is mostly a general-purpose four-column hot press, which provides a stable hot-pressing temperature through upper and lower heating platforms. The drive cylinder drives the upper heating plate to press vertically down along the guide rod to achieve the heating and pressing of the multi-layer composite mesh, thus combining the heating mesh and the oil-guiding layer into one.

[0003] For example, patent CN111497257B discloses a pressing device, which includes a positioning module, a heat-conducting module, a support module, and a movable pressing module. The positioning module is used to position the workpiece to be pressed. The support module and the heat-conducting module are both arranged adjacent to the positioning module. The support module is used to drive the movable pressing module to move in the vertical direction so that the workpiece to be pressed is clamped and fixed by the positioning module and the movable pressing module. At least a portion of the heat-conducting module can move relative to the positioning module in the horizontal direction perpendicular to the vertical direction to achieve contact with one side of the part to be pressed of the workpiece and transfer heat to the part to be pressed. The movable pressing module is arranged on the support module and can move relative to the positioning module in the horizontal direction to achieve contact with the other side of the part to be pressed of the workpiece, and press the part to be pressed of the workpiece.

[0004] For example, patent CN210790801U discloses a pressing fixture, which includes a fixed frame, a protective plate, and a material passage. In use, the worker places the workpiece in the workpiece placement slot of the lifting seat through the workpiece guide post, and places the terminal to be pressed onto the workpiece in the terminal placement slot of the pressing seat. The pressing cylinder drives the pressing seat to press and fix the terminal along the terminal guide slot into the workpiece. Then, the lifting cylinder drives the lifting seat to move upward, lifting the workpiece and the terminal upward. The worker then takes out the workpiece with the pressed terminal, completing the workpiece pressing operation.

[0005] For example, patent CN113394462B discloses a pressing device, which includes a substrate and a pressing mechanism: the substrate is used to support the part to be pressed; the pressing mechanism includes a shell and a pressing film, the shell is provided with a receiving groove and a medium hole communicating with the receiving groove, the groove opening is opposite to the substrate, the pressing film is disposed in the receiving groove and adheres to the groove wall of the receiving groove, the pressing film and the shell form a pressure cavity communicating with the medium hole; wherein, the pressing mechanism can reciprocate relative to the substrate, so that the shell overlaps with the substrate and detaches from the substrate; when the shell overlaps with the substrate, the pressure cavity can be supplied with a pressure medium through the medium hole, so that the pressing film deforms under the pressure of the pressure medium and wraps and adheres to the part to be pressed, thereby realizing the pressing of the part to be pressed.

[0006] The multilayer substrate of the composite heating mesh in electronic cigarettes is extremely thin and has a low coefficient of friction between layers. During the pressing process, relative slippage and misalignment are prone to occur, making it difficult to guarantee the alignment accuracy of the multilayer materials. At the same time, the composite material after lamination is prone to local wrinkles due to uneven tension or unstable positioning, which affects the composite quality of the product and subsequent atomization performance.

[0007] To address the aforementioned issues, there is an urgent need for innovative design based on existing equipment for processing and pressing composite heating mesh sheets for electronic cigarettes. Summary of the Invention

[0008] The purpose of this invention is to provide a pressing device for processing composite heating mesh for electronic cigarettes that prevents misalignment, in order to solve the problems mentioned in the background art. The multilayer substrate of the composite heating mesh for electronic cigarettes is extremely thin and has a low coefficient of friction between layers. During the pressing process, relative slippage and misalignment are prone to occur, making it difficult to guarantee the alignment accuracy of the multilayer materials. At the same time, the composite material after lamination is prone to local wrinkles due to uneven tension or unstable positioning, which affects the composite quality of the product and the subsequent atomization performance.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a pressing device for processing composite heating mesh for electronic cigarettes to prevent misalignment, comprising a worktable and a lower heating fixture fixedly installed on the worktable, a column guide rod fixedly installed on the worktable, a top plate fixedly installed at the top of the column guide rod, a drive cylinder installed at the center of the top plate, an upper heating fixture connected to the output end of the drive cylinder, the upper heating fixture being slidably sleeved on the column guide rod, a positioning mold pool fixedly installed on the upper surface of the lower heating fixture along the central axis, four positioning pins being provided near the four corners of the positioning mold pool, and the processing material of the composite heating mesh for electronic cigarettes being sleeved on the positioning pins; a positioning groove is provided on the positioning mold pool, a positioning slide is slidably connected in the positioning groove, the positioning slide is fixedly installed on the lower surface of the positioning pin, and a stretching mechanism is provided in the positioning mold pool to drive the positioning pin to move inclinedly along the opening direction of the positioning groove, thereby stretching and tightening the processing material of the composite heating mesh for electronic cigarettes before hot pressing.

[0010] Preferably, a movable mold is fixed on the lower surface of the upper heating fixture, and arc-shaped grooves are provided at the four corners of the movable mold. The movable mold moves down and is engaged with the outside of the positioning pin through the arc-shaped grooves.

[0011] Preferably, the stretching mechanism includes a movable rod fixedly installed on the surface of the positioning slide, and a transverse groove is provided through the side wall of the positioning mold pool, in which the movable rod is slidably connected.

[0012] Preferably, an inclined rod is fixed inside the positioning mold pool, and a fixed column is fixed on the side of the inclined rod near the inner wall of the positioning mold pool. The positioning slide is slidably installed on the inclined rod, and a positioning spring is elastically connected between the positioning slide and the fixed column.

[0013] Preferably, a guide base is fixed on the upper surface of the lower heating fixture, and two sets of sliding columns move laterally on the guide base, with the moving rod sliding through the sliding columns.

[0014] Preferably, a driven column is fixed on the upper surface of the sliding column along the central axis, and a power pressing mechanism for driving the driven column to move laterally is provided on the upper heating fixture.

[0015] Preferably, a crossbar is fixed laterally on the guide base, the crossbar is slidably mounted on the sliding column, and a return spring is elastically connected between the sliding column and the guide base.

[0016] Preferably, the power pressing mechanism includes two sets of fixed seats fixedly installed on the lower surface of the upper heating fixture. The two sets of fixed seats are located on both sides of the moving mold, and two sets of active pressing blocks are movably arranged below the fixed seats. The active pressing blocks are correspondingly arranged above the driven columns, and the side of the active pressing block closest to the driven column is arc-shaped.

[0017] Preferably, a guide rail is fixedly connected to the fixed base, and a movable groove is opened on the side of the active pressing block, through which the active pressing block is slidably connected to the guide rail.

[0018] Preferably, a threaded rod is rotatably connected to the lower part of the upper heating fixture. The threaded rod is located between two sets of active pressure blocks, and an internal thread seat is installed on the external thread of the threaded rod. A protrusion is fixed on the surface of the active pressure block, and a push rod is rotatably connected to the protrusion. The other end of the push rod is rotatably connected to the internal thread seat.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the pressing equipment for processing the anti-misalignment electronic cigarette composite heating mesh can position the multi-layer composite material by positioning pins before processing, and can stretch the multi-layer composite material by controlling the movement of positioning pins, so that the multi-layer composite material fits better, and can also avoid local wrinkles between the multi-layer composite material, thereby improving the quality of the product after pressing.

[0020] The positioning mold pool is equipped with a stretching mechanism that drives the positioning pin to move tilted along the opening direction of the positioning groove. The electronic cigarette composite heating mesh is sleeved on the positioning pin to perform preliminary positioning of the composite material. Before processing, the multi-layer composite material is stretched by tilting and moving the positioning pin, so that the multi-layer composite material is completely bonded and tightened before hot pressing to assist in subsequent pressing processing.

[0021] The upper heating fixture is equipped with a power pressing mechanism that drives the driven column to move laterally. During the downward pressing process, the upper heating fixture and the moving mold drive the active pressing block to move downward synchronously. The active pressing block can squeeze the driven column through the arc surface on the side. Through the squeezing power of the driven column, the positioning pin can be driven to move obliquely to achieve the stretching treatment of the composite material.

[0022] Based on the properties of the composite heating mesh material used in electronic cigarettes, the extrusion pressure of the active pressure block can be adjusted. By controlling the rotation of the threaded rod, the active pressure block can be controlled to move laterally below the fixed seat under the threaded drive, and its arc surface can be adjusted to correspond to the position above the driven column, thereby achieving control of the tensile force of the composite material. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the workbench structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the heating fixture structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the positioning mold pool structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the positioning pin structure of the present invention.

[0027] Figure 5 This is a schematic diagram of the positioning slide structure of the present invention.

[0028] Figure 6 This is a schematic diagram of the guide base structure of the present invention.

[0029] Figure 7 This is a schematic diagram of the driven column structure of the present invention.

[0030] Figure 8 This is a schematic diagram of the moving mold structure of the present invention.

[0031] Figure 9 This is a schematic diagram of the active pressing block structure of the present invention.

[0032] Figure 10 This is a schematic diagram of the guide rail and moving groove structure of the present invention.

[0033] Figure 11This is a schematic diagram of the internal thread seat and push rod structure of the present invention.

[0034] In the diagram: 1. Workbench; 2. Lower heating fixture; 3. Column guide rod; 4. Top plate; 5. Drive cylinder; 6. Upper heating fixture; 7. Positioning mold pool; 71. Moving mold; 72. Arc groove; 8. Positioning pin; 9. Positioning inclined groove; 10. Positioning slide; 101. Inclined rod; 102. Fixed column; 103. Positioning spring; 11. Horizontal groove; 12. Moving rod; 13. Guide base; 14. Sliding column; 141. Horizontal rod; 142. Return spring; 15. Driven column; 16. Fixed seat; 17. Active pressure block; 171. Guide rail; 172. Moving groove; 18. Threaded rod; 19. Internal threaded seat; 20. Push rod; 21. Protrusion. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1 - Figure 4 The present invention provides the following technical solution: a pressing device for processing electronic cigarette composite heating mesh to prevent misalignment, comprising a workbench 1 and a lower heating fixture 2 fixedly installed on the workbench 1. A column guide rod 3 is fixed on the workbench 1, and a top plate 4 is fixed at the top of the column guide rod 3. A drive cylinder 5 is installed at the center of the top plate 4. The output end of the drive cylinder 5 is connected to the upper heating fixture 6. The upper heating fixture 6 is slidably sleeved on the column guide rod 3. A positioning mold pool 7 is fixed on the upper surface of the lower heating fixture 2 along the central axis. Four positioning pins 8 are provided in the area near the four corners of the positioning mold pool 7. The electronic cigarette composite heating mesh processing material is sleeved on the positioning pins 8. A positioning inclined groove 9 is opened on the positioning mold pool 7. A positioning slide 10 is slidably connected in the positioning inclined groove 9. The positioning slide 10 is fixedly installed on the lower surface of the positioning pin 8. A stretching mechanism is provided in the positioning mold pool 7 to drive the positioning pin 8 to tilt and move along the opening direction of the positioning inclined groove 9, so as to realize the stretching and tightening of the electronic cigarette composite heating mesh processing material before hot pressing. The upper heating fixture 6 has a moving mold 71 fixed on its lower surface. The four corners of the moving mold 71 are provided with arc-shaped grooves 72. The moving mold 71 moves down and is engaged with the outside of the positioning pin 8 through the arc-shaped grooves 72.

[0037] According to the design of the positioning pin 8 on the positioning mold pool 7, positioning holes corresponding to the positions of the positioning pin 8 are opened on the electronic cigarette composite heating mesh processing material. Before processing, the composite processing material is placed in the positioning mold pool 7, and the composite processing material is sleeved on the positioning pin 8 through the positioning holes to initially position the pressing position of the multi-layer composite processing material and prevent misalignment between the multi-layer materials.

[0038] During processing, the drive cylinder 5 controls the upper heating fixture 6 to move downwards, and the upper heating fixture 6 drives the moving mold 71 to move downwards synchronously. The moving mold 71 moves down and presses into the positioning mold pool 7, and hot-presses the multi-layer composite material inside the positioning mold pool 7.

[0039] Before hot pressing, that is, before the moving mold 71 moves down and contacts the multilayer composite material, the multilayer composite material is stretched and tightened by the stretching mechanism, so that the multilayer composite material fits better together, and can also eliminate local wrinkles between the multilayer composite material, thereby improving the hot pressing quality of the product.

[0040] Please see Figure 2 - Figure 7 The stretching mechanism includes a movable rod 12 fixedly mounted on the surface of the positioning slide 10. A transverse groove 11 is formed through the side wall of the positioning mold pool 7, and the movable rod 12 is slidably connected in the transverse groove 11. An inclined rod 101 is fixedly fixed inside the positioning mold pool 7. A fixing post 102 is fixed on the side of the inclined rod 101 near the inner wall of the positioning mold pool 7. The positioning slide 10 is slidably mounted on the inclined rod 101, and a positioning spring 103 is elastically connected between the positioning slide 10 and the fixing post 102. A guide base 13 is fixed on the upper surface of the lower heating fixture 2. Two sets of sliding posts 14 move laterally on the guide base 13, and the movable rod 12 slides through the sliding posts 14.

[0041] The control sliding column 14 moves laterally in the guide base 13. The sliding column 14 drives the moving rod 12 to move synchronously. The moving rod 12 moves laterally through the transverse groove 11. At the same time, the moving rod 12 drives the positioning slide 10 to move laterally. Since the positioning slide 10 is slidably installed on the outside of the inclined rod 101, the moving rod 12 can control the positioning slide 10 to tilt and move on the inclined rod 101 during the movement. At this time, the moving rod 12 slides through the sliding column 14 and moves in coordination with the positioning slide 10. The positioning slide 10 is fixed at the bottom of the positioning pin 8, which can drive the positioning pin 8 to move along the opening direction of the positioning inclined groove 9. The positioning pin 8 drives the sleeved multi-layer composite material to move to the four corners of the positioning mold pool 7, realizing the stretching treatment of the multi-layer composite material and keeping the multi-layer composite material taut inside the positioning mold pool 7.

[0042] The inclined direction of the inclined rod 101 and the positioning inclined groove 9 are consistent, keeping the moving direction of the positioning pin 8 and the positioning slide 10 consistent. At the same time, the positioning slide 10 is elastically connected to the fixed column 102 through the positioning spring 103, and the sliding column 14 is elastically connected to the guide base 13 through the return spring 142. Through the elastic connection structure, the sliding column 14 and the positioning slide 10 can move and reset through elastic thrust when the sliding column 14 is not subjected to compressive force.

[0043] Example 2: Please refer to Figure 2 - Figure 7 Based on Embodiment 1, a power pressing mechanism is also disclosed, the specific structure of which is as follows: a driven column 15 is fixed on the upper surface of the sliding column 14 along the central axis, and a power pressing mechanism for driving the driven column 15 to move laterally is provided on the upper heating fixture 6. A crossbar 141 is laterally fixed on the guide base 13, and the crossbar 141 is slidably mounted on the sliding column 14. A return spring 142 is elastically connected between the sliding column 14 and the guide base 13.

[0044] Please see Figure 8 - Figure 11 The power pressing mechanism includes two sets of fixed seats 16 fixedly mounted on the lower surface of the upper heating fixture 6. The two sets of fixed seats 16 are located on both sides of the moving mold 71. Two sets of active pressing blocks 17 are movably arranged below the fixed seats 16. The active pressing blocks 17 are correspondingly arranged above the driven column 15, and the side of the active pressing block 17 closest to the driven column 15 is arc-shaped. A guide rail 171 is fixedly connected to the fixed seat 16. A moving groove 172 is opened on the side of the active pressing block 17, and the active pressing block 17 is slidably connected to the guide rail 171 through the moving groove 172. A threaded rod 18 is rotatably connected to the lower part of the upper heating fixture 6. The threaded rod 18 is located between the two sets of active pressing blocks 17. An internal thread seat 19 is installed on the external thread of the threaded rod 18. A protrusion 21 is fixed on the surface of the active pressing block 17. A push rod 20 is rotatably connected to the protrusion 21, and the other end of the push rod 20 is rotatably connected to the internal thread seat 19.

[0045] When the drive cylinder 5 controls the upper heating fixture 6 and the moving mold 71 to move downward, it drives the fixed seat 16 and the active pressure block 17 at the bottom of the upper heating fixture 6 to move downward synchronously. The active pressure block 17 moves down and contacts the upper arc surface of the driven column 15. The arc surface on the side of the active pressure block 17 presses the top of the driven column 15. The driven column 15 is fixedly installed above the sliding column 14. When it is pressed, it can control the sliding column 14 to move laterally in the guide base 13, thereby providing power for the tilting movement of the positioning pin 8.

[0046] Based on the tensile properties of the heating mesh materials of different batches of electronic cigarettes, the downward pressing amount of the active pressure block 17 can be adjusted, controlling the rotation of the threaded rod 18. The threaded rod 18 is threadedly connected to the internal threaded seat 19. Under the threaded drive, the internal threaded seat 19 can be controlled to move laterally. At this time, the two ends of the push rod 20 connected between the internal threaded seat 19 and the protrusion 21 rotate accordingly. The rotating push rod 20 can push the active pressure block 17 to move laterally below the fixed seat 16. At this time, the active pressure block 17 moves laterally along the guide rail 171 through the moving groove 172 opened on the outside. After the position of the active pressure block 17 below the fixed seat 16 is adjusted, its position above the driven column 15 changes, so that the pressing amount on the driven column 15 after it moves down also changes, thereby controlling the movement of the sliding column 14 in the guide base 13.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressing device for processing composite heating mesh for electronic cigarettes to prevent misalignment, comprising a workbench (1) and a lower heating fixture (2) fixedly installed on the workbench (1), a column guide rod (3) fixed on the workbench (1), a top plate (4) fixed at the top of the column guide rod (3), a drive cylinder (5) installed at the center of the top plate (4), an upper heating fixture (6) connected to the output end of the drive cylinder (5), and the upper heating fixture (6) slidably sleeved on the column guide rod (3), characterized in that: The lower heating fixture (2) has a positioning mold pool (7) fixed on its upper surface along the central axis. The positioning mold pool (7) has four positioning pins (8) near the four corners. The electronic cigarette composite heating mesh processing material is sleeved on the positioning pins (8). The positioning mold pool (7) is provided with a positioning groove (9), and a positioning slide (10) is slidably connected in the positioning groove (9). The positioning slide (10) is fixedly installed on the lower surface of the positioning pin (8). The positioning mold pool (7) is provided with a stretching mechanism that drives the positioning pin (8) to move tilted along the opening direction of the positioning groove (9) to realize the stretching and tightening of the electronic cigarette composite heating mesh processing material before hot pressing.

2. The pressing equipment for processing anti-misalignment electronic cigarette composite heating mesh according to claim 1, characterized in that: The upper heating fixture (6) has a moving mold (71) fixed on its lower surface. The moving mold (71) has arc-shaped grooves (72) on its four corners. The moving mold (71) moves down and is engaged with the outside of the positioning pin (8) through the arc-shaped grooves (72).

3. The pressing equipment for processing anti-misalignment composite heating mesh for electronic cigarettes according to claim 1, characterized in that: The stretching mechanism includes a movable rod (12) fixedly installed on the surface of the positioning slide (10), and a transverse groove (11) is provided through the side wall of the positioning mold pool (7), and the movable rod (12) is slidably connected in the transverse groove (11).

4. The pressing equipment for processing anti-misalignment composite heating mesh for electronic cigarettes according to claim 3, characterized in that: An inclined rod (101) is fixed inside the positioning mold pool (7). A fixing column (102) is fixed on the side of the inclined rod (101) near the inner wall of the positioning mold pool (7). The positioning slide (10) is slidably installed on the inclined rod (101), and a positioning spring (103) is elastically connected between the positioning slide (10) and the fixing column (102).

5. The pressing equipment for processing anti-misalignment electronic cigarette composite heating mesh according to claim 3, characterized in that: The upper surface of the lower heating fixture (2) is fixed with a guide base (13), and two sets of sliding columns (14) move laterally on the guide base (13). The moving rod (12) slides through the sliding column (14).

6. The pressing equipment for processing anti-misalignment composite heating mesh for electronic cigarettes according to claim 5, characterized in that: The upper surface of the sliding column (14) is fixed with a driven column (15) along the central axis, and the upper heating fixture (6) is provided with a power pressing mechanism that drives the driven column (15) to move laterally.

7. The pressing equipment for processing anti-misalignment composite heating mesh for electronic cigarettes according to claim 6, characterized in that: A horizontal bar (141) is fixed on the guide base (13) laterally, and the horizontal bar (141) is slidably installed on the sliding column (14). A return spring (142) is elastically connected between the sliding column (14) and the guide base (13).

8. The pressing equipment for processing anti-misalignment composite heating mesh for electronic cigarettes according to claim 6, characterized in that: The power pressing mechanism includes two sets of fixed seats (16) fixedly installed on the lower surface of the upper heating fixture (6). The two sets of fixed seats (16) are located on both sides of the moving mold (71). Two sets of active pressing blocks (17) are movably arranged below the fixed seats (16). The active pressure block (17) is positioned above the driven column (15), and the side of the active pressure block (17) closest to the driven column (15) is arc-shaped.

9. The pressing equipment for processing anti-misalignment electronic cigarette composite heating mesh according to claim 8, characterized in that: The fixed base (16) is fixedly connected to the guide rail (171), and the active pressure block (17) has a moving groove (172) on its side. The active pressure block (17) is slidably connected to the guide rail (171) through the moving groove (172).

10. A pressing device for processing a composite heating mesh for electronic cigarettes to prevent misalignment, as described in claim 9, characterized in that: The upper heating fixture (6) is rotatably connected to a threaded rod (18), which is located between two sets of active pressure blocks (17). The threaded rod (18) has an internal thread seat (19) installed on its external thread. The active pressure block (17) has a protrusion (21) fixed on its surface. A push rod (20) is rotatably connected to the protrusion (21). The other end of the push rod (20) is rotatably connected to the internal thread seat (19).

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