Pushing rod and workpiece fixing mechanism
By using a split-structure push rod and sleeve design, the problem of chip accumulation caused by the gap between the workpiece and the integrated push rod is solved, achieving high-precision machining and equipment cleanliness, and ensuring the integrity of the workpiece and the fastening force of the spring sleeve.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SMC CHINA
- Filing Date
- 2025-04-14
- Publication Date
- 2026-05-26
AI Technical Summary
In the prior art, the gap between the workpiece and the integrated push rod causes machining chips to enter the spring ferrule, resulting in damage to the workpiece and insufficient clamping force of the spring ferrule, producing defective products.
The push rod adopts a split structure. The rod sleeve and the rod core can move relative to each other after assembly. The rod sleeve fits tightly with the workpiece, and the rod core enters the opening of the rod sleeve to play a sealing role, preventing chips from entering the spring sleeve. Combined with the air or water supply from the spray hole, the chips are removed.
It achieves high-precision machining of workpieces, avoids chip accumulation problems in spring ferrules, ensures the integrity of workpieces and the fastening force of spring ferrules, and keeps the equipment clean.
Smart Images
Figure CN224273314U_ABST
Abstract
Description
Technical Field
[0001] This application relates to auxiliary equipment for workpiece processing, and more specifically, to a push rod and a workpiece fixing mechanism. Background Technology
[0002] When machining shaft holes on a workpiece using a CNC lathe, a fixing mechanism is needed to fix the workpiece before drilling.
[0003] Figure 1 This is a schematic diagram of a fixing mechanism with an integrated pusher rod in the prior art. Figure 1 As shown, the fixing mechanism includes a spring sleeve 20 and an integrated push rod 40. The spring sleeve 20 and the integrated push rod 40 are movable relative to each other. The workpiece 30 can be connected to one end of the spring sleeve 20, and there is a certain gap between the integrated push rod 40 and the workpiece 30. During the machining of the shaft hole on the workpiece 30, due to the structure of the integrated push rod 40, the workpiece 30 and the integrated push rod 40 cannot be directly attached. Some machining chips enter the interior of the spring sleeve 20 along the gap between the workpiece 30 and the integrated push rod 40, causing chip retention in the spring sleeve 20. If this situation persists for a long time, the proportion of workpiece 30 being pinched increases significantly, and in severe cases, it can lead to insufficient tension in the spring sleeve 30, resulting in defective products.
[0004] Therefore, a push rod and workpiece fixing mechanism are needed to solve the above problems. Utility Model Content
[0005] In view of this, the purpose of this application is to propose a push rod and a workpiece fixing mechanism to solve the problem that the existing integrated push rod does not provide satisfactory performance.
[0006] To achieve the above objectives, this application provides a pusher rod, comprising:
[0007] rod core;
[0008] A rod sleeve has a first opening and a second opening at its opposite ends. The rod sleeve is fitted onto the rod core, and the rod core passes through the first opening. The rod sleeve can reciprocate relative to the rod core within a preset range, allowing the rod core to enter and exit the second opening.
[0009] Optionally, the rod core is provided with a first limiting end and a second limiting end that are relatively distributed, and the inner wall of the rod sleeve is provided with at least one limiting member, which can reciprocate between the first limiting end and the second limiting end.
[0010] Optionally, the first limiting end and the second limiting end are respectively a first limiting plate and a second limiting plate that are opposite to each other and spaced apart on the rod core along the axial direction. The first limiting plate, the rod core and the second limiting plate surround to form a limiting groove, and the limiting member reciprocates within the limiting groove.
[0011] Optionally, both the first limiting plate and the second limiting plate are sleeved and fixed on the rod core. There are two limiting members, which are symmetrically distributed on the inner wall of the rod sleeve and enter the limiting groove from the top and bottom of the rod core, respectively.
[0012] Optionally, the limiting member is a bolt, and the rod sleeve is provided with a through hole, through which the bolt passes.
[0013] Optionally, the rod core includes a driving end and a driven end disposed opposite to each other, the first limiting plate and the second limiting plate are respectively distributed close to the driving end and the driven end, the driving end passes through the first opening; a spring is sleeved on the driven end; the spring is located between the second opening of the rod sleeve and the second limiting plate, and the transmission end can enter and exit the second opening.
[0014] Optionally, the transmission end is provided with at least one nozzle, the rod core is provided with a hollow structure, the hollow structure is connected to the nozzle, and the hollow structure is connected to the air source.
[0015] Alternatively, the hollow structure may be connected to a water source.
[0016] This application also provides a workpiece fixing mechanism, including:
[0017] As mentioned above, the push rod;
[0018] A spring sleeve is fitted over the push rod, with the core of the push rod relatively fixed inside the spring sleeve, and the sleeve of the push rod can reciprocate within the spring sleeve.
[0019] Optionally, the workpiece fixing mechanism further includes a sealing ring, wherein the rod sleeve is provided with at least one sealing ring groove distributed along the circumferential direction, the sealing ring is sleeved and connected in the sealing ring groove, and the rod sleeve contacts the spring sleeve through the sealing ring.
[0020] As can be seen from the above, the push rod and workpiece fixing mechanism provided in this application have the following advantages compared with the prior art: Using the aforementioned push rod, the rod sleeve and rod core are separate structures. After the rod sleeve and rod core are assembled together, the rod sleeve can reciprocate relative to the rod core, giving the rod sleeve a certain axial floating amount. When the spring ferrule extracts the workpiece, the workpiece and the rod sleeve remain in contact, that is, the end face of the workpiece and the end face of the rod sleeve are in contact with each other. When the workpiece is fixed, the rod core enters the second opening of the rod sleeve, providing a relative sealing effect for the rod sleeve, ensuring high-precision machining of the workpiece. At the same time, it prevents the chips generated during the machining process from entering the interior of the spring ferrule through the push rod, thus avoiding chip accumulation in the spring ferrule and ensuring that the spring ferrule is in a relatively clean state, avoiding affecting the integrity of the workpiece or the fastening force of the spring ferrule. Attached Figure Description
[0021] The above features and technical advantages of this application will become clearer and easier to understand from the following description of its embodiments in conjunction with the accompanying drawings.
[0022] Figure 1 This is a schematic diagram of a fixing mechanism with an integrated push rod in the prior art.
[0023] Figure 2 This is a schematic diagram of the push rod used in a specific embodiment of this application.
[0024] Figure 3 For including Figure 2 The diagram shows a workpiece fixing mechanism for the push rod.
[0025] The attached figures are labeled as follows:
[0026] 10. Push rod; 1. Rod core; 2. Rod sleeve; 3. Spring; 4. Bolt; 5. Spray hole; 6. Sealing ring groove; 7. Drive end; 8. Hollow structure; 20. Spring sleeve; 30. Workpiece; 40. Integrated push rod. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings. Identical components are represented 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 "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.
[0028] Figure 2 This is a schematic diagram of the push rod used in a specific embodiment of this application. Figure 3 For including Figure 2 A schematic diagram of the workpiece fixing mechanism of the pusher rod is shown. Figures 2 to 3As shown, the push rod 10 includes a rod core 1 and a rod sleeve 2.
[0029] The workpiece 30 fixing mechanism includes a rod core 1 and a rod sleeve 2. The rod sleeve 2 has a first opening and a second opening at its opposite ends. The rod sleeve 2 is sleeved on the rod core 1. The rod core 1 and the rod sleeve 2 can reciprocate relative to the rod core 1 within a preset range, so that the rod core 1 can enter and exit the second opening.
[0030] The sleeve 2 is fitted onto the core 1, with one end of the core 1 inside the sleeve 2 and the other end of the core 1 extending through the first opening, located outside the sleeve 2 and connected to the drive mechanism. The sleeve 2 reciprocates along the core 1 within a preset range, allowing the end of the core 1 inside the sleeve 2 to enter or exit the second opening. When the push rod 10 is assembled inside the spring retainer 30, the second opening of the sleeve 2 is close to the end face of the spring retainer 30 that lifts the workpiece 30. When the workpiece 30 is lifted by the elastic retainer, it abuts against the end face of the sleeve 2 with the second opening, pushing the sleeve 2 to move along the core 1 until the core 1 enters the second opening. During drilling on the workpiece 30, the workpiece 30 abuts against the sleeve 2, and the core 1 entering the second opening acts as a seal, preventing chips from entering the spring retainer 30 through the sleeve 2, thus avoiding chip accumulation in the spring retainer 30. After processing is completed, the spring sleeve 30 discharges the workpiece 30, and the rod sleeve 2 resets, that is, the rod sleeve 2 moves in the opposite direction along the rod core 1 until the rod core 1 exits the second opening.
[0031] Using the aforementioned push rod 10, the sleeve 2 and the core 1 are separate structures. After the sleeve 2 and the core 1 are assembled together, the sleeve 2 can reciprocate relative to the core 1, giving the sleeve 2 a certain axial floating amount. When the spring ferrule 30 picks up the workpiece 30, the workpiece 30 and the sleeve 2 remain in contact, that is, the end face of the workpiece 30 and the end face of the sleeve 2 are in contact with each other. When the workpiece 30 is fixed, the core 1 enters the second opening of the sleeve 2, providing a relative sealing effect for the sleeve 2, ensuring that the workpiece 30 can achieve high-precision machining. At the same time, it prevents the chips generated during the machining process from entering the interior of the spring ferrule 30 through the push rod 10, thus avoiding the problem of chip accumulation in the spring ferrule 30, ensuring that the spring ferrule 30 is in a relatively clean state, and avoiding affecting the integrity of the workpiece 30 or the fastening force of the spring ferrule 30.
[0032] In one embodiment of this application, the sleeve 2 includes an end plate and a side wall connected to the end plate. The end plate has a first opening, and the side wall surrounds and forms a second opening.
[0033] Optionally, the rod core 1 is provided with a first limiting end and a second limiting end that are relatively distributed, and the inner wall of the rod sleeve 2 is provided with at least one limiting member that can reciprocate between the first limiting end and the second limiting end. When the rod sleeve 2 moves relative to the rod core 1, the limiting member moves synchronously between the first limiting end and the second limiting end. When the limiting member moves to abut against the second limiting end, the rod core 1 exits the second opening and prevents the rod sleeve 2 from moving further; when the limiting member moves to abut against the first limiting end, the rod core 1 enters the second opening and prevents the rod sleeve 2 from moving further. By setting the first limiting end and the second limiting end, the movement range of the rod sleeve 2 is controlled, ensuring that the end face of the workpiece 30 and the end face of the rod sleeve 2 are tightly fitted, while also facilitating the push rod to prevent chips from entering the rod sleeve 2 or the spring retainer 30.
[0034] Optionally, the first limiting end and the second limiting end are respectively a first limiting plate and a second limiting plate that are axially opposite and spaced apart on the rod core 1. The first limiting plate, the rod core 1, and the second limiting plate enclose a limiting groove, and the limiting member reciprocates within the limiting groove. When the rod sleeve 2 moves relative to the rod core 1, the limiting member moves synchronously within the limiting groove. When the limiting member moves to abut against the second limiting plate, the rod core 1 exits the second opening and prevents the rod sleeve 2 from moving further; when the limiting member moves to abut against the first limiting plate, the rod core 1 enters the second opening and prevents the rod sleeve 2 from moving further. Using the first limiting plate and the second limiting plate as the limiting end results in a relatively simple structure, which helps to simplify the structure of the rod core 1.
[0035] Optionally, both the first and second limiting plates are sleeved and fixed on the rod core 1. There are two limiting members, symmetrically distributed on the inner wall of the rod sleeve 2, entering the limiting groove from the top and bottom of the rod core 1, respectively. The first and second limiting plates, along with the rod core 1 between them, form an I-shaped limiting groove. The two limiting members enter the limiting groove from the top and bottom of the rod core 1, respectively. The two limiting members are symmetrically arranged and operate simultaneously to provide effective limiting.
[0036] In one embodiment of this application, the first limiting plate is a straight plate, the second limiting plate is a trapezoidal plate, and the rod core 1 is a variable diameter shaft, that is, the diameter of the rod core 1 between the first limiting plate and the second limiting plate is relatively small, and the diameter of the rod core 1 at other positions is relatively large.
[0037] Optionally, the limiting component is a bolt 4, and the sleeve 2 is provided with a through hole, through which the bolt 4 passes. The bolt 4 has a relatively simple structure and is easy to assemble. The nut of the bolt 4 is fixed in the through hole, and the bolt enters the sleeve 2 and moves in the limiting groove to limit the relative movement distance between the sleeve 2 and the rod core 1.
[0038] In one embodiment of this application, a through hole is provided on each of the opposite sides of the sleeve 2. The through hole is a countersunk hole, and a bolt 4 is installed in each through hole.
[0039] Optionally, the rod core 1 includes a driving end 7 and a driven end disposed opposite to each other. A first limiting plate and a second limiting plate are respectively distributed close to the driving end 7 and the driven end. The driving end 7 passes through the first opening. A spring 3 is sleeved on the driven end. The spring 3 is located between the second opening and the second limiting plate of the rod sleeve 2, and the driving end can enter and exit the second opening. The driving end 7 is connected to the driving mechanism and is used to maintain the position of the rod core 1. The driven end is used to enter or exit the second exit. The first limiting plate, the second limiting plate, and the rod core 1 between them form a limiting groove. The limiting member reciprocates within the limiting groove. The spring 3 is sleeved on the driven end and is located between the second limiting plate and the second opening, abutting against the second limiting plate. When the push rod 10 is assembled inside the spring sleeve 30, the second opening of the sleeve 2 is close to the end face of the spring sleeve 30 that lifts the workpiece 30. When the workpiece 30 is lifted by the elastic spring, it abuts against the end face of the sleeve 2 with the second opening, pushing the sleeve 2 to move along the core 1 until the core 1 enters the second opening. The spring 3, located between the second limiting plate and the second opening, is compressed and deformed due to the force. During the drilling process on the workpiece 30, the workpiece 30 abuts against the sleeve 2, and the core 1 enters the second opening to seal it, preventing chips from entering the spring sleeve 30 through the sleeve 2. After the machining is completed, the spring sleeve 30 discharges the workpiece 30. To restore its elastic deformation, the spring 3 pushes the sleeve 2 to reset, that is, the sleeve 2 moves in the opposite direction along the core 1 until the core 1 exits the second opening. Using the above-mentioned core 1, the structure is relatively simple, the movement distance of the sleeve 2 relative to the core 1 can be precisely controlled, and it can self-reset.
[0040] In one embodiment of this application, the drive end 7 has a thread, and the drive end 7 and the drive mechanism are threadedly connected to each other, thereby improving the connection stability.
[0041] Optionally, at least one nozzle 5 is provided on the transmission end, and a hollow structure 8 is provided on the rod core 1. The hollow structure 8 is connected to the nozzle 5 and to the air source. When drilling a hole in the workpiece 30, or after the workpiece 30 is processed, the air source supplies air to the hollow structure 8. The airflow inside the hollow structure 8 is sprayed onto the workpiece 30 through the nozzle 5. The chips move away from the push rod 10 under the action of the airflow to remove the generated or residual chips. With the above structure, the nozzle 5 sprays airflow, which can carry away the chips, ensuring that the push rod 10 and the inside of the spring sleeve 30 remain clean.
[0042] In one embodiment of this application, the hollow structure 8 is right-angled, that is, it includes an extension section along the axial direction of the core 1 and an extension section along the radial direction of the core 1.
[0043] In one embodiment of this application, a plurality of spray holes 5 are evenly distributed on the end face of the rod core 1 facing the second opening, and the spray holes 5 are connected to the hollow structure.
[0044] Alternatively, the hollow structure 8 can be connected to a water source. When drilling into the workpiece 30, the water source supplies water to the hollow structure 8. The water inside the hollow structure 8 is sprayed onto the workpiece 30 through the nozzle 5. The chips move away from the pusher rod 10 under the action of the water flow. Simultaneously, the lower temperature of the water provides cooling for the workpiece 30. With this structure, the water jet from the nozzle 5 carries away the chips while providing a cooling effect.
[0045] In one embodiment of this application, the gas source and the water source may share the inlet of the hollow structure 8, or two openings may be made in the hollow structure 8 to connect to the gas source and the water source respectively.
[0046] The following section further describes the usage process of the workpiece 30 fixing mechanism.
[0047] A spring 3 is fitted onto the driven end of the rod core 1. The driven end of the rod core 1 enters the rod sleeve 2 through the first opening. The limiting member on the rod sleeve 2 enters the limiting groove. The driving end 7 of the rod core 1 is located outside the first opening and is connected to the driving mechanism. The push rod 10 is assembled inside the spring retainer 30. The second opening of the rod sleeve 2 is close to the end face of the spring retainer 30 that picks up the workpiece 30. When the workpiece 30 is picked up by the elastic retainer, the workpiece 30 abuts against the end face of the rod sleeve 2 with the second opening and pushes the rod sleeve 2 to move along the rod core 1 until the rod core 1 enters the second opening. The spring 3 is compressed and deformed due to the pushing force of the workpiece 30. The limiting member moves to abut against the first limiting plate and prevents the rod sleeve 2 from moving further. During the drilling process on workpiece 30, workpiece 30 abuts against rod sleeve 2, and rod core 1 enters the second opening to seal it. Water is supplied to the hollow structure, and the water inside the hollow structure is sprayed onto workpiece 30 through nozzle 5. Under the action of the water flow, the chips move away from the push rod 10, preventing the chips from entering the spring sleeve 30 through rod sleeve 2. After the machining is completed, spring sleeve 30 discharges workpiece 30. To restore its elastic deformation, spring 3 pushes rod sleeve 2 to reset, that is, rod sleeve 2 moves in the opposite direction along rod core 1 until rod core 1 exits the second opening; the limiting member moves to abut against the second limiting plate and prevents rod sleeve 2 from moving further. Air is supplied to the hollow structure, and the airflow inside the hollow structure 8 is sprayed onto workpiece 30 through nozzle 5. Under the action of the airflow, the chips move away from the push rod 10 to remove generated or residual chips.
[0048] This application also provides a workpiece 30 fixing mechanism, including: a push rod 10 as described above and a spring sleeve 30, the spring sleeve 30 being sleeved outside the push rod 10, the rod core 1 of the push rod 10 being relatively fixed inside the spring sleeve 30, and the rod sleeve 2 of the push rod 10 being able to reciprocate within the spring sleeve 30.
[0049] Assemble the push rod 10 and then assemble it into the spring sleeve 30. If a spring 3 is fitted onto the driven end of the rod core 1, the driven end of the rod core 1 enters the sleeve 2 through the first opening. The limiting member on the sleeve 2 enters the limiting groove. The driving end 7 of the rod core 1 is located outside the first opening and connected to the driving mechanism. Assemble the push rod 10 into the spring sleeve 30. The second opening of the sleeve 2 is close to the end face of the spring sleeve 30 that extracts the workpiece 30. When the workpiece 30 is extracted by the elastic spring, it abuts against the end face of the sleeve 2 with the second opening, pushing the sleeve 2 along the rod core 1 until the rod core 1 enters the second opening. The spring 3 is compressed and deformed by the pushing force of the workpiece 30. The limiting member moves to abut against the first limiting plate and prevents the sleeve 2 from moving further. During the drilling process on workpiece 30, workpiece 30 abuts against rod sleeve 2, and rod core 1 enters the second opening to provide a seal. Water is supplied to the hollow structure 8, and the water inside the hollow structure 8 is sprayed onto workpiece 30 through nozzle 5. Under the action of the water flow, the chips move away from the push rod 10, preventing the chips from entering the spring sleeve 30 through rod sleeve 2. After the machining is completed, spring sleeve 30 discharges workpiece 30. To restore its elastic deformation, spring 3 pushes rod sleeve 2 to reset, that is, rod sleeve 2 moves in the opposite direction along rod core 1 until rod core 1 exits the second opening; the limiting member moves to abut against the second limiting plate and prevents rod sleeve 2 from moving further. Air is supplied to the hollow structure 8, and the airflow inside the hollow structure 8 is sprayed onto workpiece 30 through nozzle 5. Under the action of the airflow, the chips move away from the push rod 10 to remove generated or residual chips.
[0050] The workpiece 30 fixing mechanism adopts the aforementioned push rod 10. The rod sleeve 2 and rod core 1 are separate structures. After the rod sleeve 2 and rod core 1 are assembled together, the rod sleeve 2 can reciprocate relative to the rod core 1, giving the rod sleeve 2 a certain axial floating amount. When the spring ferrule 30 picks up the workpiece 30, the workpiece 30 and the rod sleeve 2 remain in contact, that is, the end face of the workpiece 30 and the end face of the rod sleeve 2 are in contact with each other. When the workpiece 30 is fixed, the rod core 1 enters the second opening of the rod sleeve 2, providing a relative sealing effect for the rod sleeve 2, ensuring that the workpiece 30 can achieve high-precision machining. At the same time, it prevents the chips generated during the machining process from entering the interior of the spring ferrule 30 through the push rod 10, thus avoiding the problem of chip accumulation in the spring ferrule 30 and ensuring that the spring ferrule 30 is in a relatively clean state, avoiding affecting the integrity of the workpiece 30 or the fastening force of the spring ferrule 30.
[0051] Optionally, the workpiece 30 fixing mechanism further includes a sealing ring. The rod sleeve 2 has at least one sealing ring groove 6 distributed along the circumferential direction. The sealing ring is fitted and connected within the sealing ring groove 6, and the rod sleeve 2 contacts the spring retainer 30 through the sealing ring. The sealing ring can prevent chips from further spreading within the spring retainer 30. By adding the sealing ring, the rod sleeve 2 contacts the spring retainer 30 through the sealing ring, improving the sealing performance between the spring retainer 30 and the rod sleeve 2, and further preventing chips from entering the spring retainer 30.
[0052] As can be seen from the above description and practice, the push rod and workpiece fixing mechanism provided in this application have the following advantages compared with the prior art: Using the above-mentioned push rod, the rod sleeve and rod core adopt a separate structure, and after the rod sleeve and rod core are assembled together, the rod sleeve can reciprocate relative to the rod core, giving the rod sleeve a certain axial floating amount. When the spring ferrule extracts the workpiece, the workpiece and the rod sleeve remain in contact, that is, the end face of the workpiece and the end face of the rod sleeve are in contact with each other. When the workpiece is fixed, the rod core enters the second opening of the rod sleeve, providing a relative sealing effect for the rod sleeve, ensuring that the workpiece can achieve high-precision machining. At the same time, it prevents the chips generated during the machining process from entering the interior of the spring ferrule through the push rod, thus avoiding the problem of chip accumulation in the spring ferrule and ensuring that the spring ferrule is in a relatively clean state, avoiding affecting the integrity of the workpiece or the fastening force of the spring ferrule.
[0053] Those skilled in the art should understand that the above description is merely a specific embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the scope of this application should be included within the protection scope of this application.
Claims
1. A push rod, characterized in that, include: rod core; A rod sleeve has a first opening and a second opening at its opposite ends. The rod sleeve is fitted onto the rod core, and the rod core passes through the first opening. The rod sleeve can reciprocate relative to the rod core within a preset range, allowing the rod core to enter and exit the second opening.
2. The push rod according to claim 1, characterized in that: The rod core is provided with a first limiting end and a second limiting end that are relatively distributed. The inner wall of the rod sleeve is provided with at least one limiting member, which can reciprocate between the first limiting end and the second limiting end.
3. The push rod according to claim 2, characterized in that: The first limiting end and the second limiting end are respectively a first limiting plate and a second limiting plate that are opposite to each other and spaced apart on the rod core along the axial direction. The first limiting plate, the rod core and the second limiting plate surround to form a limiting groove, and the limiting member reciprocates within the limiting groove.
4. The push rod according to claim 3, characterized in that: Both the first limiting plate and the second limiting plate are sleeved and fixed on the rod core. There are two limiting members, which are symmetrically distributed on the inner wall of the rod sleeve and enter the limiting groove from the top and bottom of the rod core, respectively.
5. The push rod according to claim 4, characterized in that: The limiting component is a bolt, and the rod sleeve is provided with a through hole, through which the bolt passes.
6. The push rod according to claim 4 or 5, characterized in that: The rod core includes a driving end and a driven end arranged opposite to each other. The first limiting plate and the second limiting plate are respectively distributed close to the driving end and the driven end. The driving end passes through the first opening. A spring is sleeved on the driven end. The spring is located between the second opening of the rod sleeve and the second limiting plate. The driven end can enter and exit the second opening.
7. The push rod according to claim 6, characterized in that: The driven end is provided with at least one nozzle, the rod core is provided with a hollow structure, the hollow structure is connected to the nozzle, and the hollow structure is connected to the air source.
8. The push rod according to claim 7, characterized in that: The hollow structure is connected to the water source.
9. A workpiece fixing mechanism, characterized in that, include: The push rod as described in any one of claims 1 to 8; A spring sleeve is fitted over the push rod, with the core of the push rod relatively fixed inside the spring sleeve, and the sleeve of the push rod can reciprocate within the spring sleeve.
10. The workpiece fixing mechanism according to claim 9, characterized in that: The workpiece fixing mechanism further includes a sealing ring. The rod sleeve is provided with at least one sealing ring groove distributed along the circumferential direction. The sealing ring is sleeved and connected in the sealing ring groove. The rod sleeve contacts the spring sleeve through the sealing ring.