Lateral clamping supporting oil cylinder
By providing a limit groove on the side wall of the support rod of the support cylinder and using the limit block of the clamping piston for limit support, the problem of the support force affected by the friction coefficient in the prior art is solved, and more stable support force and effective support for large workpieces are achieved.
Patent Information
- Application Number
- CN202421808297.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-29
AI Technical Summary
In the prior art, the support force of the supporting cylinder is greatly affected by the friction coefficient and cannot withstand the processing demand of large workpieces.
A lateral clamped support oil cylinder is designed. By opening a limiting groove on the side wall of the support rod and inserting the limiting block of the clamping piston into the groove, limiting support for the support rod is achieved to avoid the support force being affected by the friction coefficient.
The support stability of the support cylinder is improved, and the processing of large workpieces can be more effectively supported, solving the problem that the support force is affected by the friction coefficient.
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Figure CN222843932U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil cylinder related equipment, in particular to a lateral clamping supporting oil cylinder. Background Art
[0002] Hydraulic support cylinders are mainly used in mechanical processing. After being pressed into contact with the workpiece, they generate supporting force on the workpiece to reduce the vibration intensity of the workpiece during the processing, thereby preventing the workpiece from being deformed.
[0003] In the prior art, the supporting oil cylinder only plays the role of ejecting the supporting rod through the ejection piston, and the magnitude of its supporting force is affected by the friction coefficient, which results in poor supporting force of the oil cylinder; and the existing supporting oil cylinders are small in size and cannot withstand the processing requirements of large workpieces. Utility Model Content
[0004] The utility model aims to provide a lateral clamping support oil cylinder to alleviate the technical problems existing in the prior art that the size of the support force is affected by the friction coefficient, resulting in poor support force of the oil cylinder and the inability to withstand the processing requirements of large workpieces.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] In the first aspect, the utility model provides a lateral clamping support cylinder, comprising a support cylinder structure and a clamping cylinder structure connected to the support cylinder structure, wherein the support cylinder structure comprises a support rod and an ejection spring, one end of the support rod is connected to the ejection spring, and the other end is used to support a workpiece, and a limiting groove is provided on the side wall of the support rod;
[0007] The clamping cylinder structure comprises a clamping piston, one end of which is provided with a limiting block, and the clamping piston is used for limiting the support rod by inserting the limiting block into the limiting groove.
[0008] Furthermore, the support cylinder structure further comprises a support cylinder body, a flange and a bottom cover, the support cylinder body is connected to the clamping cylinder structure, and one end of the support cylinder body is connected to the flange, and the other end is connected to the bottom cover;
[0009] The support cylinder body, the flange and the bottom cover surround a receiving cavity for receiving the support rod and the ejection spring;
[0010] One end of the ejection spring away from the support rod is connected to the bottom cover;
[0011] One end of the support rod away from the ejection spring passes through the flange.
[0012] Furthermore, an abutment portion is provided at the bottom of the support rod along the circumferential direction, and an abutment groove is provided on the cavity wall of the accommodating cavity, and the abutment groove is used to abut with the abutment portion to limit the support rod.
[0013] Furthermore, the flange is connected to the support cylinder body through a first screw, and the flange is provided with a first sealing ring for sealing the gap between the flange and the support rod.
[0014] Furthermore, the bottom cover is provided with a slot, and the slot is connected to the ejection spring;
[0015] The bottom cover is provided with a through hole communicating with the slot, and the bottom cover is provided with a second sealing ring at the through hole;
[0016] A third sealing ring is provided on the side wall of the bottom cover along the circumferential direction, and the third sealing ring is in close contact with the inner wall of the support cylinder body.
[0017] Furthermore, a side wall of the support cylinder body is provided with an exhaust assembly, and the exhaust assembly is used to exhaust the gas in the accommodating cavity.
[0018] Further, the exhaust assembly includes an exhaust valve sleeve and an exhaust plug, and the exhaust valve sleeve is connected to the side wall of the support cylinder body;
[0019] The exhaust plug is connected to the exhaust valve sleeve.
[0020] Furthermore, the clamping cylinder structure also includes a clamping cylinder body and a clamping piece, one end of the clamping cylinder body is connected to the clamping piece, and the other end is connected to the supporting cylinder structure, and the clamping cylinder body and the clamping piece are provided with an accommodating space for accommodating the clamping piston.
[0021] Furthermore, the clamping cylinder body is provided with a fourth sealing ring, a fifth sealing ring and a sixth sealing ring;
[0022] The fourth sealing ring is used to seal the gap between the clamping cylinder body and the supporting cylinder structure;
[0023] The fifth sealing ring is used to seal the gap between the clamping cylinder body and the clamping piston;
[0024] The sixth sealing ring is used to seal the gap between the clamping cylinder body and the clamping member.
[0025] Further, the clamping member is connected to the clamping cylinder body via a second screw;
[0026] The clamping member is provided with a limiting assembly, the limiting assembly includes a limiting bolt and a seventh sealing ring, the limiting bolt is connected to the clamping member, and the limiting bolt is used to limit the clamping piston;
[0027] The seventh sealing ring is used to seal the gap between the limiting bolt and the clamping member;
[0028] The clamping piston is provided with an eighth sealing ring, and the eighth sealing ring is used to seal the gap between the clamping piston and the clamping member.
[0029] The utility model can achieve the following beneficial effects:
[0030] In the first aspect, the utility model provides a lateral clamping support cylinder, including a support cylinder structure and a clamping cylinder structure connected to the support cylinder structure, the support cylinder structure including a support rod and an ejection spring, one end of the support rod is connected to the ejection spring, and the other end is used to support the workpiece, and a limiting groove is provided on the side wall of the support rod; the clamping cylinder structure includes a clamping piston, one end of the clamping piston is provided with a limiting block, and the clamping piston is used to limit the support rod by inserting the limiting block into the limiting groove.
[0031] In the utility model, the supporting cylinder structure is connected to the clamping cylinder structure, and the supporting cylinder structure is provided with a supporting rod which can be pushed out by an ejection spring, and a limiting groove is provided on the side wall of the supporting rod, and a limiting block of the clamping cylinder structure is abutted in the limiting groove to achieve the technical effect of limiting the support of the supporting rod; it should be noted that the moving direction of the limiting block is perpendicular to the distribution direction of the supporting rod.
[0032] Compared with the prior art, the lateral clamping support cylinder provided by the utility model sets a clamping cylinder structure in a direction perpendicular to the support rod, so that the limit block of the clamping cylinder structure abuts against the limit groove to support the support rod, thereby avoiding the support force being affected by the friction coefficient.
[0033] In summary, the utility model at least alleviates the technical problems existing in the prior art that the supporting force of the oil cylinder is poor due to the influence of the friction coefficient on the size of the supporting force, and the oil cylinder cannot withstand the processing requirements of large workpieces. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0035] Figure 1 A schematic diagram of the three-dimensional structure of a lateral clamping support cylinder provided in an embodiment of the utility model;
[0036] Figure 2A partial perspective side view schematic diagram of a lateral clamping support cylinder provided by an embodiment of the utility model;
[0037] Figure 3 A schematic front view of the cross-sectional structure of a lateral clamping support cylinder provided in an embodiment of the utility model;
[0038] Figure 4 A partial perspective top view schematic diagram of a lateral clamping support cylinder provided in an embodiment of the utility model.
[0039] Icons: 1-support cylinder structure; 11-support cylinder body; 111-exhaust assembly; 1111-exhaust valve sleeve; 1112-exhaust plug; 12-flange; 121-first screw; 122-first sealing ring; 13-support rod; 131-limiting groove; 132-abutment portion; 14-bottom cover; 141-second sealing ring; 142-third sealing ring; 15-ejection spring; 2-clamping cylinder structure; 21-clamping cylinder body; 211-fourth sealing ring; 212-fifth sealing ring; 213-sixth sealing ring; 22-clamping piece; 221-second screw; 222-limiting assembly; 2221-limiting bolt; 2222-seventh sealing ring; 23-clamping piston; 231-limiting block; 232-eighth sealing ring. DETAILED DESCRIPTION
[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0043] In the description of the present utility model, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0044] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0046] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0047] Embodiment 1
[0048] This embodiment provides a lateral clamping support cylinder, referring to Figure 1 and Figure 3 The lateral clamping support cylinder includes a support cylinder structure 1 and a clamping cylinder structure 2 connected to the support cylinder structure 1. The support cylinder structure 1 includes a support rod 13 and an ejection spring 15. One end of the support rod 13 is connected to the ejection spring 15, and the other end is used to support the workpiece, and a limiting groove 131 is provided on the side wall of the support rod 13; the clamping cylinder structure 2 includes a clamping piston 23, and a limiting block 231 is provided at one end of the clamping piston 23. The clamping piston 23 is used to limit the support rod 13 by inserting the limiting block 231 into the limiting groove 131.
[0049] The embodiments of the utility model at least alleviate the technical problems existing in the prior art that the supporting force of the oil cylinder is poor because the size of the supporting force is affected by the friction coefficient, and the technical problems that the oil cylinder cannot withstand the processing requirements of large workpieces.
[0050] In an embodiment of the utility model, the support cylinder structure 1 is connected to the clamping cylinder structure 2, and the support cylinder structure 1 is provided with a support rod that can be pushed out by an ejection spring 15, and a limiting groove 131 is opened on the side wall of this support rod 13, and the limiting block 231 of the clamping cylinder structure 2 abuts against this limiting groove 131 to achieve the technical effect of limiting the support rod 13; it should be noted that the moving direction of the limiting block 231 is perpendicular to the distribution direction of the support rod 13.
[0051] Compared with the prior art, the lateral clamping support cylinder provided in the embodiment of the utility model is configured with a clamping cylinder structure 2 in a direction perpendicular to the support rod 13, so that the limit block 231 of the clamping cylinder structure 2 abuts against the limit groove 131 to support the support rod 13, thereby avoiding the support force being affected by the friction coefficient.
[0052] In an optional implementation manner of this embodiment, refer to Figure 3 The support cylinder structure 1 also includes a support cylinder body 11, a flange 12 and a bottom cover 14. The support cylinder body 11 is connected to the clamping cylinder structure 2, and one end of the support cylinder body 11 is connected to the flange 12, and the other end is connected to the bottom cover 14; the support cylinder body 11, the flange 12 and the bottom cover 14 surround a receiving cavity for accommodating a support rod 13 and an ejection spring 15; one end of the ejection spring 15 away from the support rod 13 is connected to the bottom cover 14; one end of the support rod 13 away from the ejection spring 15 passes through the flange 12.
[0053] Specifically: the top of the support cylinder body 11 is connected to the flange 12, and the bottom thereof is connected to the bottom cover 14; preferably, the support cylinder body 11 is detachably connected to the flange 12 and the bottom cover 14, respectively, and a receiving cavity is formed after the connection, and this receiving cavity is used to receive the support rod 13 and the ejection spring 15, and the support rod 13 and the ejection spring 15 are distributed in the direction toward the flange 12, and the end of the support rod 13 passes through the flange 12 to support the workpiece.
[0054] Further, refer to Figure 3 An abutment portion 132 is circumferentially provided at the bottom of the support rod 13 , and an abutment groove is provided on the cavity wall of the accommodating cavity, and the abutment groove is used to abut against the abutment portion 132 to limit the support rod 13 .
[0055] Specifically: a raised abutment portion 132 is circumferentially provided at the bottom of the support rod 13, and an abutment groove is provided on the cavity wall of the accommodating cavity. When in use, when the support rod 13 is moved upward, the abutment portion 132 will eventually abut against the abutment groove to limit the support rod 13 and prevent the support rod 13 from being continuously ejected toward the flange 12.
[0056] Further, refer to Figure 3The flange 12 is connected to the support cylinder body 11 through a first screw 121 , and the flange 12 is provided with a first sealing ring 122 for sealing the gap between the flange 12 and the support rod 13 .
[0057] Specifically: the flange 12 is provided with a plurality of first screws 121 at intervals, and the flange 12 is connected to the support cylinder body 11 through the first screws 121, and a first sealing ring 122 is circumferentially provided on the inner wall of the flange 12, and the first sealing ring 122 is clamped on the outer wall of the support rod 13 to seal the gap between the flange 12 and the support rod 13.
[0058] In an optional implementation manner of this embodiment, refer to Figure 3 The bottom cover 14 is provided with a slot, and the slot is connected to the ejection spring 15; the bottom cover 14 is provided with a through hole connected to the slot, and the bottom cover 14 is provided with a second sealing ring 141 at the through hole; the side wall of the bottom cover 14 is provided with a third sealing ring 142 along the circumferential direction, and the third sealing ring 142 is tightly abutted against the inner wall of the support cylinder body 11.
[0059] Specifically, the bottom cover 14 is provided with a slot, which is used to insert the ejection spring 15 to fix the bottom of the ejection spring 15, and the bottom of the bottom cover 14 is provided with a through hole, which is connected to the slot; and the bottom of the bottom cover 14 is provided with a second sealing ring 141, which is provided with a sealing portion to seal the bottom of the through hole. The side wall of the bottom cover 14 is provided with a third sealing ring 142 along the circumferential direction, and the third sealing ring 142 is used to tightly abut against the inner wall of the support cylinder body 11.
[0060] In an optional implementation manner of this embodiment, refer to Figure 2 The side wall of the support cylinder body 11 is provided with an exhaust component 111, and the exhaust component 111 is used to discharge the gas in the accommodating cavity.
[0061] Specifically, the side wall of the support cylinder body 11 is provided with an exhaust assembly 111, and the exhaust assembly 111 is used to exhaust the gas in the accommodating cavity to cooperate with the support rod 13 to move in the accommodating cavity.
[0062] Further, refer to Figure 2 The exhaust assembly 111 includes an exhaust valve sleeve 1111 and an exhaust plug 1112 . The exhaust valve sleeve 1111 is connected to the side wall of the support cylinder body 11 ; the exhaust plug 1112 is connected to the exhaust valve sleeve 1111 .
[0063] Specifically: the exhaust valve sleeve 1111 is connected to the side wall of the support cylinder body 11, and an exhaust plug 1112 is provided in the exhaust valve sleeve 1111. The exhaust plug 1112 is used to adjust the gas inside and outside the accommodating chamber during the movement of the support rod 13 so that the support rod 13 can move more smoothly.
[0064] In an optional implementation manner of this embodiment, refer to Figure 3 or Figure 4 The clamping cylinder structure 2 also includes a clamping cylinder body 21 and a clamping member 22. One end of the clamping cylinder body 21 is connected to the clamping member 22, and the other end is connected to the supporting cylinder structure 1. The clamping cylinder body 21 and the clamping member 22 are provided with an accommodating space for accommodating the clamping piston 23.
[0065] Specifically: one end of the clamping cylinder body 21 is connected to the clamping piece 22, and the other end is connected to the support cylinder structure 1, and the clamping cylinder body 21 and the clamping piece 22 are provided with a receiving space for accommodating the clamping piston 23, and this receiving space is connected to the receiving cavity of the support cylinder structure 1, so as to be used for limiting the support rod 13 by moving the clamping piston 23.
[0066] Further, refer to Figure 3 The clamping cylinder body 21 is provided with a fourth sealing ring 211, a fifth sealing ring 212 and a sixth sealing ring 213; the fourth sealing ring 211 is used to seal the gap between the clamping cylinder body 21 and the supporting cylinder structure 1; the fifth sealing ring 212 is used to seal the gap between the clamping cylinder body 21 and the clamping piston 23; the sixth sealing ring 213 is used to seal the gap between the clamping cylinder body 21 and the clamping member 22.
[0067] Specifically: the clamping cylinder body 21 is provided with a fourth sealing ring 211, a fifth sealing ring 212 and a sixth sealing ring 213. When in use, it abuts against the support cylinder body 11 through the fourth sealing ring 211, abuts against the clamping piston 23 through the fifth sealing ring 212, and finally abuts against the clamping member 22 through the sixth sealing ring 213, thereby achieving sealing of each gap.
[0068] In an optional implementation manner of this embodiment, refer to Figure 2 The clamping piece 22 is connected to the clamping cylinder body 21 by a second screw 221; the clamping piece 22 is provided with a limiting assembly 222, the limiting assembly 222 includes a limiting bolt 2221 and a seventh sealing ring 2222, the limiting bolt 2221 is connected to the clamping piece 22, and the limiting bolt 2221 is used to limit the clamping piston 23; the seventh sealing ring 2222 is used to seal the gap between the limiting bolt 2221 and the clamping piece 22; the clamping piston 23 is provided with an eighth sealing ring 232, and the eighth sealing ring 232 is used to seal the gap between the clamping piston 23 and the clamping piece 22.
[0069] Specifically: the clamping piece 22 is detachably connected to the clamping cylinder body 21 through the second screw 221; and the limiting bolt 2221 of the limiting assembly 222 passes through the supporting cylinder body 11 and abuts against the clamping cylinder body 21 to limit it, and the limiting bolt is used to seal with the side wall of the supporting cylinder body 11 through the seventh sealing ring 2222, and the eighth sealing ring 232 is used to seal the gap between the clamping piston 23 and the clamping piece 22.
[0070] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other; the above embodiments in this specification are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A lateral clamping support cylinder, characterized in that: It comprises a support cylinder structure (1) and a clamping cylinder structure (2) connected to the support cylinder structure (1), the support cylinder structure (1) comprises a support rod (13) and an ejection spring (15), one end of the support rod (13) is connected to the ejection spring (15), and the other end is used to support a workpiece, and a limiting groove (131) is provided on the side wall of the support rod (13); The clamping cylinder structure (2) comprises a clamping piston (23), one end of which is provided with a limiting block (231), and the clamping piston (23) is used to limit the support rod (13) by inserting the limiting block (231) into the limiting groove (131).
2. The lateral clamping support cylinder according to claim 1, characterized in that: The support cylinder structure (1) further comprises a support cylinder body (11), a flange (12) and a bottom cover (14); the support cylinder body (11) is connected to the clamping cylinder structure (2), and one end of the support cylinder body (11) is connected to the flange (12), and the other end is connected to the bottom cover (14); The support cylinder body (11), the flange (12) and the bottom cover (14) enclose a receiving cavity for receiving the support rod (13) and the ejection spring (15); One end of the ejection spring (15) away from the support rod (13) is connected to the bottom cover (14); One end of the support rod (13) away from the ejection spring (15) passes through the flange (12).
3. The lateral clamping support cylinder according to claim 2, characterized in that: The bottom of the support rod (13) is provided with an abutment portion (132) along the circumferential direction, and the cavity wall of the accommodating cavity is provided with an abutment groove, and the abutment groove is used to abut against the abutment portion (132) to limit the support rod (13).
4. The lateral clamping support cylinder according to claim 3, characterized in that: The flange (12) is connected to the support cylinder body (11) via a first screw (121), and the flange (12) is provided with a first sealing ring (122) for sealing the gap between the flange and the support rod (13).
5. The lateral clamping support cylinder according to claim 3, characterized in that: The bottom cover (14) is provided with a slot, and the slot is connected to the ejection spring (15); The bottom cover (14) is provided with a through hole communicating with the slot, and the bottom cover (14) is provided with a second sealing ring (141) at the through hole; A third sealing ring (142) is provided on the side wall of the bottom cover (14) along the circumferential direction, and the third sealing ring (142) is in tight contact with the inner wall of the support cylinder body (11).
6. The lateral clamping support cylinder according to claim 2, characterized in that: The side wall of the support cylinder body (11) is provided with an exhaust component (111), and the exhaust component (111) is used to exhaust the gas in the accommodating cavity.
7. The lateral clamping support cylinder according to claim 6, characterized in that: The exhaust assembly (111) comprises an exhaust valve sleeve (1111) and an exhaust plug (1112); the exhaust valve sleeve (1111) is connected to the side wall of the support cylinder body (11); The exhaust plug (1112) is connected to the exhaust valve sleeve (1111).
8. The lateral clamping support cylinder according to claim 1, characterized in that: The clamping cylinder structure (2) further comprises a clamping cylinder body (21) and a clamping member (22), one end of the clamping cylinder body (21) being connected to the clamping member (22), and the other end being connected to the supporting cylinder structure (1), and the clamping cylinder body (21) and the clamping member (22) being provided with an accommodation space for accommodating the clamping piston (23).
9. The lateral clamping support cylinder according to claim 8, characterized in that: The clamping cylinder body (21) is provided with a fourth sealing ring (211), a fifth sealing ring (212) and a sixth sealing ring (213); The fourth sealing ring (211) is used to seal the gap between the clamping cylinder body (21) and the supporting cylinder structure (1); The fifth sealing ring (212) is used to seal the gap between the clamping cylinder body (21) and the clamping piston (23); The sixth sealing ring (213) is used to seal the gap between the clamping cylinder body (21) and the clamping member (22).
10. The lateral clamping support cylinder according to claim 8 or 9, characterized in that: The clamping member (22) is connected to the clamping cylinder body (21) via a second screw (221); The clamping member (22) is provided with a limiting assembly (222), the limiting assembly (222) comprising a limiting bolt (2221) and a seventh sealing ring (2222), the limiting bolt (2221) being connected to the clamping member (22), and the limiting bolt (2221) being used to limit the position of the clamping piston (23); The seventh sealing ring (2222) is used to seal the gap between the limiting bolt (2221) and the clamping member (22); The clamping piston (23) is provided with an eighth sealing ring (232), and the eighth sealing ring (232) is used to seal the gap between the clamping piston (23) and the clamping member (22).