Pushing assembly

Abstract

The utility model discloses a material pushing assembly which comprises a rod sleeve, a material pushing assembly, a material pushing assembly and a material pushing assembly. The piston can move in the rod sleeve in a reciprocating mode, the rod sleeve is divided into a mounting cavity and a buffering cavity by the piston, and at least one liquid distribution hole is formed in the piston; the medium pipe is rotatably connected into the rod sleeve and can reciprocate along the rod sleeve, the piston and the medium pipe are located on the two opposite sides of the first spring respectively, and the medium pipe communicates with a medium source and is used for providing a medium for the buffer cavity; and the driving mechanism is connected with the medium pipe and can drive the medium pipe to reciprocate. The utility model discloses a material pushing assembly to solve the problem that the service life of a collet chuck is affected by cuttings of an existing workpiece.

Description

Technical Field

[0001] The present application relates to the technical field of processing equipment, and more specifically, to a pusher assembly. Background Art

[0002] During batch processing on automated CNC lathes, the ejector rod must stably and reliably eject the workpiece from the collet. If a large amount of chips are generated during machining, they can significantly impact both the workpiece and the collet, potentially causing malfunction and ineffective collet actuation. Even small amounts of chips remaining within the collet can cause pinching or chip damage to the workpiece surface where the collet clamps, resulting in defective workpieces. Furthermore, significant labor is required to clean the collet and repair the workpiece, resulting in significant time commitment.

[0003] Therefore, a pusher assembly is needed to solve the above problems. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a pusher assembly to solve the problem that the chips of the existing workpiece affect the service life of the collet.

[0005] Based on the above purpose, the present application provides a pusher assembly, comprising:

[0006] A rod sleeve, wherein a first spring is provided in the rod sleeve;

[0007] A piston capable of reciprocating in the rod sleeve and dividing the rod sleeve into a mounting chamber and a buffer chamber, and the piston is provided with at least one liquid distribution hole;

[0008] a medium tube, the medium tube being rotatably connected within the rod sleeve and capable of reciprocating along the rod sleeve, the piston and the medium tube being respectively located on opposite sides of the first spring, the medium tube being in communication with a medium source and being used to provide medium to the buffer chamber;

[0009] A driving mechanism is connected to the medium pipe and can drive the medium pipe to move back and forth.

[0010] Optionally, the rod sleeve is provided with at least one first sealing groove distributed along the circumferential direction, and a first sealing ring is provided in the first sealing groove.

[0011] Optionally, the piston includes a piston plate and a second sealing ring, and the liquid distribution hole is arranged along the axial direction of the piston plate; the piston plate is provided with a second sealing groove distributed along the circumferential direction, and the second sealing ring is provided in the second sealing groove. When the piston is provided in the rod sleeve, the piston plate abuts against the rod sleeve through the second sealing ring.

[0012] Optionally, the medium tube includes a first end and a second end that are oppositely arranged, the first end is connected to the medium source, and a bearing is provided on the second end, and the medium tube is connected to the rod sleeve through the bearing.

[0013] Optionally, the medium pipe includes an extension pipe section and a diameter-reducing pipe section that are connected in sequence, the free end of the extension pipe section is the first end, and the free end of the diameter-reducing pipe section is the second end.

[0014] Optionally, the extension pipe section and the reducing pipe section are detachably connected.

[0015] Optionally, a bushing is provided between the bearing and the rod sleeve, the medium tube is connected to the bearing via a first positioning pin, and the bushing is connected to the rod sleeve via a second positioning pin.

[0016] Optionally, the bushing is provided with at least one third sealing groove distributed along the circumferential direction, and a third sealing ring is provided in the third sealing groove. When the bushing is inserted into the rod sleeve, the bushing abuts against the rod sleeve through the third sealing ring.

[0017] Optionally, the driving mechanism includes a pushing cylinder, a piston rod and a connecting assembly, the output end of the pushing cylinder is connected to the piston rod, and the connecting assembly includes a first connecting end and a second connecting end arranged opposite to each other, the first connecting end is floatingly connected to the piston rod, and the second connecting end is fixedly connected to the medium pipe.

[0018] Optionally, the connecting assembly includes a connecting plate, a first fastening pad, a second fastening pad, a second spring, a third fastening pad and a fourth fastening pad, and the connecting plate is provided with a first connecting hole and a second connecting hole that are opposite and spaced apart, and the piston rod and the medium pipe are respectively passed through the first connecting hole and the second connecting hole; the first fastening pad and the second fastening pad are both connected to the piston rod and are respectively located on opposite sides of the connecting plate, and the second spring is sleeved on the piston rod and is located between the connecting plate and the second fastening pad; the third fastening pad and the fourth fastening pad are both connected to the medium pipe and are respectively located on opposite sides of the connecting plate.

[0019] From the above, it can be seen that the pusher assembly provided by the present application has the following advantages compared with the prior art: using the above-mentioned pusher assembly, first, the rod sleeve covers and intercepts the inner wall of the collet except for the workpiece installation position, provides a sealing effect, and prevents chips from entering the collet and causing residue. When the collet rotates with the workpiece, the rod sleeve rotates accordingly to avoid wear caused by end face friction. Second, the driving mechanism drives the medium tube to move to adjust the supporting force provided by the first spring to the piston, so that during the processing, the workpiece can be flexibly attached to the piston to prevent chips from entering the collet and the interior of the rod sleeve. After the processing is completed, the driving mechanism drives the medium tube to push the piston to move so that the workpiece is effectively discharged. Third, after the processing is completed, the flushing medium flushes the rod sleeve and the collet through the medium tube to remove the chips left over from the processing process and avoid residual effects on subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above features and technical advantages of the present application will become clearer and easier to understand through the following description of its embodiments in conjunction with the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the pusher assembly used in the specific embodiment of the present application.

[0022] Figure 2 for Figure 1 Schematic diagram of the use status of the pusher assembly shown.

[0023] Figure 3 for Figure 1 The schematic structural diagram of the pusher assembly is shown.

[0024] Wherein the accompanying drawings are:

[0025] 1. Push cylinder; 2. First fastening pad; 3. Connecting plate; 4. Second spring; 5. Second fastening pad; 6. Third fastening pad; 7. Fourth fastening pad; 8. Extension pipe section; 9. Reducer pipe section; 10. Bearing; 11. Bushing; 12. Third sealing ring; 13. First locating pin; 14. Second locating pin; 15. First sealing ring II; 16. First spring; 17. First sealing ring I; 18. Piston; 19. Second sealing ring; 20. Liquid distribution hole; 21. Rod sleeve; 22. Collet; 23. Workpiece. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of this application more clearly understood, the present application is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. Identical parts are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings. The terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0027] Figure 1 This is a schematic diagram of the pusher assembly used in the specific embodiment of the present application. Figure 2 for Figure 1 Schematic diagram of the use status of the pusher assembly shown. Figure 3 for Figure 1 The schematic diagram of the structure of the pusher assembly is shown in FIG. Figures 1 to 3 As shown, the pusher assembly includes a rod sleeve 21, a piston 18, a medium pipe 8 and a driving mechanism.

[0028] The first spring 16 is arranged in the rod sleeve 21; the rod sleeve 21 is used to be inserted into the collet 22. In one embodiment of the present application, the rod sleeve 21 is hollow.

[0029] Piston 18 reciprocates within rod sleeve 21, dividing rod sleeve 21 into a mounting chamber and a buffer chamber. Piston 18 is also equipped with at least one liquid distribution hole 20. Piston 18 reciprocates within rod sleeve 21. The front side of piston 18 is used to mount workpiece 23, forming the mounting chamber. The rear side of piston 18 is used to accommodate first spring 16. When workpiece 23 abuts piston 18, first spring 16 pushes piston 18 and workpiece 23 together to achieve a better fit. Multiple liquid distribution holes 20 are evenly distributed throughout piston 18. After the flushing medium enters the buffer chamber, it can only enter the mounting chamber through the liquid distribution hole 20 of piston 18.

[0030] The medium tube 8 is rotatably connected to the rod sleeve 21 and can reciprocate within the rod sleeve 21. The piston 18 and the medium tube 8 are located on opposite sides of the first spring 16. The medium tube 8 is connected to a medium source and is used to provide medium to the buffer chamber. The medium tube 8 has two functions: first, when the workpiece 23 is installed, the workpiece 23 enters the rod sleeve 21 and abuts against the piston 18. The piston 18 pushes the first spring 16, and the medium tube 8 moves toward the rod sleeve 21, causing the first spring 16 to abut against the medium tube 8. The first spring 16 deforms and provides a reverse force for the piston 18, allowing the piston 18 to fit tightly against the workpiece 23. Second, the medium tube 8 is connected to the medium source. When the medium source provides medium, the medium flows along the medium tube 8 into the buffer chamber.

[0031] The drive mechanism is connected to the medium pipe 8 and can drive the medium pipe 8 to move back and forth. The drive mechanism can drive the medium pipe 8 to move back and forth along the rod sleeve 21 to cooperate with the installation and removal of the workpiece 23.

[0032] The collet 22 includes an opposing mounting end and a flushing end, connected by a hollow structure. The rod sleeve 21 is inserted into the hollow structure, such that the rod sleeve 21 is flush with the flushing end and spaced a certain distance from the mounting end. The medium tube 8 and the piston 18 are connected to opposite ends of the rod sleeve 21, with the first spring 16 positioned between the piston 18 and the medium tube 8. The drive mechanism is connected to the end of the medium tube 8 away from the rod sleeve 21.

[0033] When installing workpiece 23, workpiece 23 enters rod sleeve 21 and abuts piston 18. Piston 18 pushes first spring 16, causing medium tube 8 to move into rod sleeve 21, causing first spring 16 to abut against medium tube 8. First spring 16 deforms, providing a counterforce for piston 18, allowing piston 18 to fit tightly and flexibly against workpiece 23. After workpiece 23 is installed, one end of workpiece 23 is inserted into rod sleeve 21, with the middle end abutting the end face of rod sleeve 21. The other end is exposed outside collet chuck 22, allowing workpiece 23 to be processed. When collet chuck 22 rotates with workpiece 23, rod sleeve 21 rotates synchronously with collet chuck 22, preventing friction between the end faces. After processing is completed, the medium source provides flushing medium to medium tube 8. The flushing medium enters the buffer chamber through medium tube 8 and flushes the installation chamber through liquid distribution hole 20 in piston 18, preventing chips from remaining in rod sleeve 21 and collet chuck 22.

[0034] Using the above-mentioned pushing assembly, first, the rod sleeve 21 covers and intercepts the inner wall of the collet 22 except for the installation position of the workpiece 23, providing a sealing effect to prevent chips from entering the collet 22 and causing residue. When the collet 22 rotates with the workpiece 23, the rod sleeve 21 rotates accordingly to prevent wear caused by end face friction. Second, the driving mechanism drives the medium tube 8 to move to adjust the supporting force provided by the first spring 16 to the piston 18, so that during the processing, the workpiece 23 can be flexibly attached to the piston 18 to prevent chips from entering the collet 22 and the interior of the rod sleeve 21. After the processing is completed, the driving mechanism drives the medium tube 8 to push the piston 18 to move so that the workpiece 23 is effectively discharged. Third, after the processing is completed, the flushing medium is used to flush the rod sleeve 21 and the collet 22 through the medium tube 8 to remove the chips left over from the processing process and avoid residual effects on subsequent use.

[0035] Optionally, the rod sleeve 21 is provided with at least one first sealing groove distributed along the circumference, with a first sealing ring disposed within the first sealing groove. When the rod sleeve 21 is inserted into the hollow structure of the collet 22, the rod sleeve 21 abuts against the collet 22 via the first sealing ring. The first sealing ring prevents chips from entering between the rod sleeve 21 and the collet 22; furthermore, the friction of the first sealing ring enables the rod sleeve 21 and the collet 22 to rotate synchronously.

[0036] In one embodiment of the present application, two first sealing grooves are provided on the rod sleeve 21 opposite to and spaced apart from each other, and the first sealing ring I17 and the first sealing ring II15 are respectively nested in the two first sealing grooves. The first sealing ring I17 and the first sealing ring II15 both protrude from the first sealing groove and contact the inner wall of the collet 22.

[0037] Optionally, the piston 18 includes a piston plate 18 and a second sealing ring 19, and a liquid distribution hole 20 is provided along the axial direction of the piston plate 18; a second sealing groove distributed along the circumferential direction is provided on the piston plate 18, and a second sealing ring 19 is provided in the second sealing groove. When the piston 18 is set in the rod sleeve 21, the piston plate 18 abuts against the rod sleeve 21 through the second sealing ring 19. Multiple liquid distribution holes 20 are evenly distributed on the piston plate 18. The first spring 16 can abut against the piston plate 18. The second sealing ring 19 is nested in the second sealing groove, and the second sealing ring 19 protrudes from the second sealing groove and contacts the inner wall of the rod sleeve 21. The second sealing ring 19 can prevent chips from entering the rod sleeve 21, and the friction force of the second sealing ring 19 enables the piston 18 to better cooperate with the rod sleeve 21. The above-mentioned piston 18 has a simple structure, can provide effective sealing, and is easy to drive.

[0038] Optionally, the medium tube 8 includes a first end and a second end disposed opposite each other. The first end is connected to the medium source, and the second end is provided with a bearing 10. The medium tube 8 is connected to the rod sleeve 21 via the bearing 10. When the medium tube 8 is mounted within the rod sleeve 21 via the bearing 10, the medium tube 8 can remain stationary relative to the rod sleeve 21 as the rod sleeve 21 rotates with the collet 22. This ensures that the medium can effectively pass through the medium tube 8 and enter the rod sleeve 21. This medium tube 8 has a relatively simple structure, and the medium tube 8 and rod sleeve 21 can rotate relative to each other, preventing end-face friction.

[0039] Optionally, the medium pipe 8 includes an extension pipe section 8 and a reducing pipe section 9 that are connected in sequence. The free end of the extension pipe section 8 is the first end, and the free end of the reducing pipe section 9 is the second end. The diameter of the rod sleeve 21 is generally larger than the diameter of the medium pipe 8. The medium pipe 8 includes but is not limited to a stepped pipe. The diameter of the reducing pipe section 9 is larger than the diameter of the extension pipe section 8. The use of a reducing pipe provides better structural stability.

[0040] In order to facilitate disassembly and assembly, optionally, the extension pipe section 8 and the reducing pipe section 9 are detachably connected.

[0041] In one embodiment of the present application, the extension pipe section 8 and the reducing pipe section 9 are connected by threads.

[0042] Optionally, a bushing 11 is provided between the bearing 10 and the rod sleeve 21. The medium tube 8 is connected to the bearing 10 via a first locating pin 13, and the bushing 11 is connected to the rod sleeve 21 via a second locating pin 14. The bearing 10 includes an inner ring, an outer ring, and balls positioned between the inner and outer rings. The inner ring is connected to the medium tube 8 via a first locating pin 13, and the outer ring is connected to the rod sleeve 21 via a second locating pin 14. When the rod sleeve 21 rotates, the bushing 11 and outer ring rotate with the rod sleeve 21, while the inner ring and the medium tube 8 remain relatively stationary. The use of the bushing 11 improves wear resistance and reduces friction.

[0043] Optionally, the bushing 11 is provided with at least one third sealing groove distributed along the circumferential direction, and a third sealing ring 12 is provided in the third sealing groove. When the bushing 11 is inserted into the rod sleeve 21, the bushing 11 abuts against the rod sleeve 21 through the third sealing ring 12. The friction force of the third sealing ring 12 causes the rod sleeve 21 and the bushing 11 to rotate synchronously.

[0044] In one embodiment of the present application, a third sealing groove is provided on the bushing 11 , a third sealing ring 12 is nested in the third sealing groove, the third sealing ring 12 protrudes from the third sealing groove and contacts the inner wall of the rod sleeve 21 .

[0045] Optionally, the drive mechanism includes a push cylinder 1, a piston rod (not labeled), and a connecting assembly. The output end of the push cylinder 1 is connected to the piston rod. The connecting assembly includes a first connecting end and a second connecting end arranged opposite each other. The first connecting end is in a floating connection with the piston rod, and the second connecting end is fixedly connected to the medium pipe 8. The piston rod is connected to the medium pipe 8 through the connecting assembly. When the push cylinder 1 drives the piston rod to reciprocate, the medium pipe 8 reciprocates synchronously with the piston rod under the action of the connecting assembly. The above-mentioned drive mechanism has a relatively simple structure and provides effective drive for the medium pipe 8.

[0046] Optionally, the connection assembly includes a connection plate 3, a first fastening pad 2, a second fastening pad 5, a second spring 4, a third fastening pad 6, and a fourth fastening pad 7. The connection plate 3 is provided with a first connection hole and a second connection hole that are opposite and spaced apart. The piston rod and the medium pipe 8 are respectively passed through the first connection hole and the second connection hole. The first fastening pad 2 and the second fastening pad 5 are both connected to the piston rod and are respectively located on opposite sides of the connection plate 3. The second spring 4 is sleeved on the piston rod and is located between the connection plate 3 and the second fastening pad 5. The third fastening pad 6 and the fourth fastening pad 7 are both connected to the medium pipe 8 and are respectively located on opposite sides of the connection plate 3. The first fastening pad 2 and the second fastening pad 5 are respectively located on opposite sides of the connection plate 3. The second spring 4 is sleeved on the piston rod. One end of the second spring 4 contacts the connection plate 3 and the other end contacts the second fastening pad 5. The connection plate 3 can push the second spring 4 to compress. When the second spring 4 recovers its deformation, it pushes the connection plate 3 to move to the first fastening pad 2. The third and fourth fastening pads 6 and 7 are located on opposite sides of the connecting plate 3 and are used to secure the connecting plate 3 in position on the medium tube 8. Specifically, the piston rod is rigidly connected to the medium tube 8 via the connecting plate 3, while the piston rod and connecting plate 3 are floatingly connected. When the workpiece 23 is installed in the collet chuck 22, the workpiece 23 moves rightward, squeezing the piston 18. The piston 18 moves rightward, squeezing the first spring 16. The first spring 16 compresses and pushes the medium tube 8 rightward. At this time, the medium tube 8 drives the connecting plate 3 rightward, which in turn moves rightward, squeezing the second spring 4. The first and second springs 16 and 4 restore their deformation, applying force to the piston 18, keeping it firmly against the workpiece 23. When workpiece 23 is finished, push cylinder 1 drives the piston rod leftward. The piston rod drives medium tube 8 leftward through connecting plate 3. Medium tube 8 pushes first spring 16 leftward, which in turn pushes piston 18 leftward. Piston 18 pushes workpiece 23 out of collet chuck 22. First spring 16 and second spring 4 both recover their elastic deformation. This connection assembly offers a clever structure, smooth driving, and a high degree of freedom.

[0047] The following further introduces the use process of the pusher assembly.

[0048] The rod sleeve 21 is arranged in the collet 22, and the rod sleeve 21 is in contact with the collet 22 through a first sealing ring. The piston 18 is arranged in the rod sleeve 21, and the piston 18 plate is in contact with the rod sleeve 21 through a second sealing ring 19. A bushing 11 is arranged in the rod sleeve 21, and the bushing 11 is in contact with the rod sleeve 21 through a third sealing ring 12. The medium tube 8 is installed in the bushing 11 through a bearing 10. The inner ring of the bearing 10 is connected to the medium tube 8 through a first locating pin 13, and the outer ring of the bearing 10 is connected to the rod sleeve 21 through a second locating pin 14. The medium pipe 8 is connected to the medium source through a hose, and the medium pipe 8 is inserted into the second connecting hole. The third fastening pad 6 and the fourth fastening pad 7 are respectively located on the opposite sides of the connecting plate 3, and are used to fix the position of the connecting plate 3 on the medium pipe 8; the piston rod is connected to the push rod, and the piston rod is inserted into the first connecting hole. The first fastening pad 2 and the second fastening pad 5 are both connected to the piston rod, and are respectively located on the opposite sides of the connecting plate 3. The second spring 4 is sleeved on the piston rod and is located between the connecting plate 3 and the second fastening pad 5.

[0049] When workpiece 23 is not installed, first spring 16 and second spring 4 are in their natural state. When workpiece 23 is installed in collet chuck 22, workpiece 23 moves rightward, compressing piston 18. Piston 18 moves rightward, compressing first spring 16. First spring 16 compresses and pushes medium tube 8 rightward. At this point, medium tube 8 drives connecting plate 3 rightward, which in turn compresses second spring 4. To restore their deformation, first spring 16 and second spring 4 apply force to piston 18, forcing it to rest against workpiece 23 and achieving a flexible fit. When collet chuck 22 rotates with workpiece 23, rod sleeve 21 rotates synchronously with collet chuck 22, preventing friction between the end faces. Bearing 10 maintains medium tube 8 relative to its original position. When workpiece 23 is machined, push cylinder 1 drives the piston rod leftward. The piston rod drives medium tube 8 leftward through connecting plate 3. Medium tube 8 pushes first spring 16 leftward, which in turn pushes piston 18 leftward. Piston 18 pushes workpiece 23 out of collet chuck 22. First spring 16 and second spring 4 both recover their elastic deformation. After workpiece 23 is pushed out, the medium source provides flushing medium to medium tube 8. The flushing medium enters the buffer chamber through medium tube 8 and flushes the mounting chamber through liquid distribution hole 20 of piston 18, preventing chips from remaining in rod sleeve 21 and collet chuck 22.

[0050] From the above description and practice, it can be seen that the pusher assembly provided by the present application has the following advantages compared with the prior art: using the above-mentioned pusher assembly, first, the rod sleeve covers and intercepts the inner wall of the collet except for the workpiece installation position, provides a sealing effect, and prevents chips from entering the collet and causing residue. When the collet rotates with the workpiece, the rod sleeve rotates accordingly to avoid wear caused by end face friction. Second, the driving mechanism drives the medium tube to move to adjust the supporting force provided by the first spring to the piston, so that during the processing, the workpiece can be flexibly attached to the piston to prevent chips from entering the collet and the inside of the rod sleeve. After the processing is completed, the driving mechanism drives the medium tube to push the piston to move so that the workpiece is effectively discharged. Third, after the processing is completed, the flushing medium flushes the rod sleeve and the collet through the medium tube to remove the chips left over from the processing process and avoid residual effects on subsequent use.

[0051] Those skilled in the art should understand that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the scope of the present application should be included in the scope of protection of the present application.

Claims

1. A pusher assembly, characterized in that: include: a rod sleeve, wherein a first spring is provided in the rod sleeve; A piston capable of reciprocating in the rod sleeve and dividing the rod sleeve into a mounting chamber and a buffer chamber, and the piston is provided with at least one liquid distribution hole; a medium tube, the medium tube being rotatably connected within the rod sleeve and capable of reciprocating along the rod sleeve, the piston and the medium tube being respectively located on opposite sides of the first spring, the medium tube being in communication with a medium source and being used to provide medium to the buffer chamber; A driving mechanism is connected to the medium pipe and can drive the medium pipe to move back and forth.

2. The pusher assembly according to claim 1, characterized in that: The rod sleeve is provided with at least one first sealing groove distributed along the circumferential direction, and a first sealing ring is provided in the first sealing groove.

3. The pusher assembly according to claim 1 or 2, characterized in that: The piston includes a piston plate and a second sealing ring. The liquid distribution hole is arranged along the axial direction of the piston plate; the piston plate is provided with a second sealing groove distributed along the circumferential direction, and the second sealing ring is provided in the second sealing groove. When the piston is set in the rod sleeve, the piston plate abuts against the rod sleeve through the second sealing ring.

4. The pusher assembly according to claim 1 or 2, characterized in that: The medium tube includes a first end and a second end that are oppositely arranged. The first end is communicated with the medium source. A bearing is provided on the second end. The medium tube is connected to the rod sleeve through the bearing.

5. The pusher assembly according to claim 4, characterized in that: The medium pipe includes an extension pipe section and a diameter-reducing pipe section that are connected in sequence. The free end of the extension pipe section is the first end, and the free end of the diameter-reducing pipe section is the second end.

6. The pusher assembly according to claim 5, characterized in that: The extension pipe section and the diameter-reducing pipe section are detachably connected.

7. The pusher assembly according to claim 4, characterized in that: A bushing is provided between the bearing and the rod sleeve, the medium pipe is connected to the bearing via a first positioning pin, and the bushing is connected to the rod sleeve via a second positioning pin.

8. The pusher assembly according to claim 7, characterized in that: The bushing is provided with at least one third sealing groove distributed along the circumferential direction, and a third sealing ring is provided in the third sealing groove. When the bushing is inserted into the rod sleeve, the bushing abuts against the rod sleeve through the third sealing ring.

9. The pusher assembly according to claim 1 or 2, characterized in that: The driving mechanism includes a pushing cylinder, a piston rod and a connecting assembly. The output end of the pushing cylinder is connected to the piston rod. The connecting assembly includes a first connecting end and a second connecting end arranged opposite to each other. The first connecting end is floatingly connected to the piston rod, and the second connecting end is fixedly connected to the medium pipe.

10. The pusher assembly according to claim 9, characterized in that: The connecting assembly includes a connecting plate, a first fastening pad, a second fastening pad, a second spring, a third fastening pad and a fourth fastening pad. The connecting plate is provided with a first connecting hole and a second connecting hole that are opposite and spaced apart. The piston rod and the medium pipe are respectively passed through the first connecting hole and the second connecting hole; the first fastening pad and the second fastening pad are both connected to the piston rod and are respectively located on opposite sides of the connecting plate; the second spring is sleeved on the piston rod and is located between the connecting plate and the second fastening pad; the third fastening pad and the fourth fastening pad are both connected to the medium pipe and are respectively located on opposite sides of the connecting plate.

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