A locking vice which is easy to operate

Abstract

The utility model relates to a locking bench vice convenient to operate, including base, fixedly installed support riser of base, fixedly installed pressure rod mechanism and pressure platform mechanism on support riser and can carry out height adjustment along vertical direction, pressure rod mechanism includes telescopic pressure rod subassembly fixedly installed on support riser and sets up adjusting lever subassembly between telescopic pressure rod subassembly and pressure platform mechanism, adjusting lever subassembly can adjust the interval of pressure platform mechanism and telescopic pressure rod subassembly along vertical direction, and telescopic pressure rod subassembly drives adjusting lever subassembly and pressure platform mechanism synchronous movement along vertical direction, the convenient operation's locking bench vice of this technical scheme drives adjusting lever subassembly and pressure platform mechanism synchronous movement along vertical direction through drive telescopic pressure rod subassembly movement along vertical direction, realizes the quick pressure of workpiece, and overall operation is convenient and fast, through the setting of adjusting lever subassembly, can make the whole structure carry out fine adjustment pressure to workpiece, and the stability and clamping accuracy of product workpiece clamping are improved.

Description

Technical Field

[0001] This utility model relates to the field of locking devices, specifically to a locking vise that is easy to operate. Background Technology

[0002] Manual quick clamps are commonly used tooling in machining, assembly and other processes to quickly fix workpieces. Traditional manual clamping devices such as bench vises and ordinary small presses are frequently used in the production process.

[0003] A bench vise is a clamping tool fixed to a workbench, widely used in machining, woodworking, and fitter work. It is mainly used to clamp workpieces for operations such as sawing, filing, drilling, and tapping. When using a regular bench vise, the screw needs to be manually rotated to clamp or release the workpiece, which is inefficient, time-consuming, and labor-intensive. While ordinary presses can quickly lock or release clamped workpieces, they often require special customization. However, they are only suitable for clamping workpieces of a specific diameter or thickness and cannot perform fine-tuning of the clamping, resulting in poor clamping accuracy. Other existing clamping mechanisms can achieve fast and high-precision clamping, but their production costs are too high, making them inconvenient for production use.

[0004] Therefore, to solve the above problems, a quick-locking bench vise that is easy to operate is needed to address the aforementioned technical issues. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a locking vise that is easy to operate. By driving the telescopic pressure rod assembly to move in the vertical direction, the adjusting rod assembly and the pressure table mechanism move synchronously in the vertical direction, so as to achieve rapid clamping of the workpiece. The overall operation is convenient and quick. By setting the adjusting rod assembly, the overall structure can finely adjust the clamping of the workpiece, improving the stability and clamping accuracy of the product. At the same time, the product is inexpensive and easy to promote and use.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An easy-to-operate locking bench vise includes a base, a support frame fixedly mounted on the base, a pressure bar mechanism fixedly mounted on the support frame and adjustable in height in the vertical direction, and a pressure table mechanism fixedly mounted at the lower end of the pressure bar mechanism. The pressure bar mechanism includes a telescopic pressure bar assembly fixedly mounted on the support frame and an adjusting rod assembly disposed between the telescopic pressure bar assembly and the pressure table mechanism. The adjusting rod assembly can adjust the distance between the pressure table mechanism and the telescopic pressure bar assembly in the vertical direction, and the telescopic pressure bar assembly drives the adjusting rod assembly and the pressure table mechanism to move synchronously in the vertical direction.

[0007] Furthermore, the telescopic pressure rod assembly includes a horizontal plate fixedly installed with the support frame, a suspension fixedly installed on the horizontal plate, a guide sleeve fixedly installed with the suspension, a pressure rod slidably passing through the guide sleeve, and a drive mechanism fixedly installed on the suspension; the drive mechanism drives the pressure rod to reciprocate linearly in the vertical direction. The base is fixedly installed with the workstation. The support frame includes two identical and parallel support plates, fixedly installed on the base, providing installation points for the integrated installation of other components. A suspension structure is fixedly installed on the horizontal plate for installation with other components. The suspension includes a horizontal seat fixedly installed on the horizontal plate and a vertical cantilever fixedly installed with the horizontal seat. The guide sleeve is fixedly connected to the lower end of the vertical cantilever. The drive mechanism is installed with the upper end of the vertical cantilever. The output end of the drive mechanism drives the guide sleeve to reciprocate linearly in the vertical direction, achieving the pressing or releasing of the workpiece.

[0008] Furthermore, the driving mechanism includes a driving handle and a connecting arm. The connecting arm is hinged to the suspension. The driving handle includes a connecting section and a handle section that are perpendicular to each other. The upper end of the connecting section is hinged to the connecting arm, and the lower end of the connecting section is hinged to the upper end of the pressure rod. Rotation of the handle section drives the connecting section and the pressure rod to move. The driving handle has an overall L-shaped structure. The driving handle includes a connecting section and a handle section that are perpendicular to each other. The lower end of the connecting section is hinged to the pressure rod, and the upper end of the connecting section is hinged to the connecting arm. The upper end of the connecting arm is hinged to the vertical cantilever. Rotation of the handle section of the driving handle drives the connecting section to rotate accordingly. The movement of the connecting section drives the pressure rod to reciprocate vertically within the guide sleeve. Of course, when this driving handle structure is used, if the connecting section and the pressure rod are on the same straight line, the entire pressure rod and the driving handle form a self-locking structure, which facilitates locking of the workpiece and ensures the stability and locking accuracy of the workpiece clamping.

[0009] Furthermore, the adjusting rod assembly includes an adjusting screw and a limiting mounting sleeve. The limiting mounting sleeve is fixedly installed on the pressure table mechanism, and the adjusting screw passes through the limiting mounting sleeve and is installed in conjunction with the pressure rod.

[0010] Furthermore, the adjusting screw protrusion forms a screw boss, and the limiting mounting sleeve has a screw mounting hole for installing the adjusting screw. The screw boss is installed inside the limiting mounting sleeve, and the limiting mounting sleeve is used to axially limit the screw boss. After the adjusting screw passes through the limiting mounting sleeve, its upper end cooperates with the pressure rod for threaded adjustment installation, and the lower end of the adjusting screw correspondingly forms a screw boss structure. The adjusting screw and pressure rod rotate to adjust their installation position. The limiting mounting sleeve is used to axially limit the adjusting screw, but does not affect the internal rotation adjustment of the adjusting screw.

[0011] Furthermore, the pressure rod is machined with an internal thread that mates with the adjusting screw, and a handwheel for rotating the adjusting screw is fixedly mounted on the adjusting screw.

[0012] Furthermore, the pressing platform mechanism includes a pressing platform, a pressing platform crossbeam fixedly installed on the support frame, and guide rods fixedly installed between the pressing platform crossbeam and the base. There are two guide rods, and the two guide rods are arranged in parallel to each other.

[0013] Furthermore, a guide hole is provided on the pressure platform, and a guide sleeve that is slidably installed in the guide hole to cooperate with the guide rod is fixedly installed.

[0014] Furthermore, it also includes a pressing block assembly, which includes an upper pressing block installed at the lower end of the pressing table mechanism and a lower pressing block installed on the base, the upper pressing block and the lower pressing block having the same structure.

[0015] Furthermore, an arc-shaped groove is formed in the middle of the lower pressure block, and two positioning inclined surfaces are formed on the lower pressure block, symmetrically distributed with respect to the arc-shaped groove. The lower pressure block is fixedly installed on the base by bolts, and the arc-shaped groove structure is recessed in the middle of the lower pressure block. Two positioning inclined surfaces are also provided at the upper end of the lower pressure block, symmetrically distributed with respect to the arc-shaped groove. The two positioning inclined surfaces and the arc-shaped groove facilitate effective positioning and clamping of tubular workpieces of different diameters, ensuring the stability of workpiece clamping. Of course, for clamping non-tubular workpieces, only the two corresponding pressure blocks need to be replaced, which is convenient, quick, and easy to use.

[0016] The beneficial effects of this technical solution are: This technical solution features an easy-to-operate locking vise. By driving the telescopic pressure rod assembly to move vertically, it drives the adjusting rod assembly and the pressure table mechanism to move synchronously vertically, achieving rapid clamping of the workpiece. The overall operation is convenient and quick. The adjusting rod assembly allows for fine-tuning of the overall structure to clamp the workpiece, improving the stability and accuracy of the product's workpiece clamping. At the same time, the product is inexpensive and easy to promote and use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front view of the present utility model; Figure 3 This is a top view of the present invention; Figure 4 for Figure 3 Sectional view of AA.

[0018] The attached diagram lists the components represented by each number as follows: 1. Base; 2. Support frame; 3. Telescopic pressure bar assembly; 4. Adjusting rod assembly; 5. Pressing platform mechanism; 6. Pressing block assembly; 31. Horizontal plate; 32. Horizontal seat; 33. Drive handle; 34. Guide sleeve; 35. Pressure bar; 36. Vertical cantilever; 37. Connecting arm; 41. Adjusting screw; 42. Handwheel; 43. Limiting mounting sleeve; 44. Screw boss; 51. Pressing platform; 52. Guide rod; 53. Guide sliding sleeve; 61. Upper pressing block; 62. Lower pressing block; 63. Arc groove; 64. Positioning inclined surface. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the brush sleeve mechanism of this utility model; Figure 3 This is a schematic diagram of the cleaning brush mechanism of this utility model; Figure 4 This is a schematic diagram of the turntable mechanism of this utility model; As shown in the figure, this embodiment provides an easy-to-operate locking bench vise, including a base 1, a support frame 2 fixedly installed on the base 1, a pressure rod mechanism fixedly installed on the support frame 2 and adjustable in height in the vertical direction, and a pressure table mechanism 5 fixedly installed at the lower end of the pressure rod mechanism; the pressure rod mechanism includes a telescopic pressure rod assembly 3 fixedly installed on the support frame 2 and an adjusting rod assembly 4 disposed between the telescopic pressure rod assembly 3 and the pressure table mechanism 5. The adjusting rod assembly 4 can adjust the distance between the pressure table mechanism 5 and the telescopic pressure rod assembly 3 in the vertical direction, and the telescopic pressure rod assembly 3 drives the adjusting rod assembly 4 and the pressure table mechanism 5 to move synchronously in the vertical direction.

[0024] This technical solution features an easy-to-operate locking vise. By driving the telescopic pressure rod assembly 3 to move vertically, it drives the adjusting rod assembly 4 and the pressure table mechanism 5 to move synchronously in the vertical direction, achieving rapid clamping of the workpiece. The overall operation is convenient and quick. The setting of the adjusting rod assembly 4 allows the overall structure to fine-tune the clamping of the workpiece, improving the stability and clamping accuracy of the product. At the same time, the product is inexpensive and easy to promote and use.

[0025] In this embodiment, the telescopic pressure rod assembly 3 includes a horizontal plate 31 fixedly installed in conjunction with the support frame 2, a suspension fixedly installed on the horizontal plate 31, a guide sleeve 34 fixedly installed in conjunction with the suspension, a pressure rod 35 slidably passing through the guide sleeve 34, and a drive mechanism fixedly installed on the suspension; the drive mechanism drives the pressure rod 35 to reciprocate linearly in the vertical direction.

[0026] The base 1 is fixedly installed at the workstation. The support frame 2 includes two identical and parallel support plates. The support frame 2 is fixedly installed on the base 1, providing installation points for the integrated installation of other components. The horizontal plate 31 is fixedly installed between the two support plates. A suspension structure is fixedly installed on the horizontal plate 31 for installation with other components. The suspension includes a horizontal seat 32 fixedly installed on the horizontal plate 31 and a vertical cantilever 36 fixedly installed with the horizontal seat 32. The guide sleeve 34 is fixedly connected to the lower end of the vertical cantilever 36, and the drive mechanism is connected to the upper end of the vertical cantilever 36. After installation, the pressure rod 35 passes through the guide sleeve 34 and is installed in conjunction with the output end of the drive mechanism. The corresponding output end of the drive mechanism drives the guide sleeve 34 to reciprocate linearly in the vertical direction, thereby pressing or releasing the workpiece. With the setting of the horizontal seat 32 and the vertical cantilever 36, different types of drive devices such as pneumatic, electric, and hydraulic can be used for the selection and replacement of the drive device. The production enterprise can flexibly switch the drive mode according to its own automation level and production rhythm, without large-scale modification of the tooling system, quickly respond to diversified production needs, and enhance the flexibility and adaptability of the production line.

[0027] In this embodiment, the driving mechanism includes a driving handle 33 and a connecting arm 37. The connecting arm 37 is hinged to the suspension. The driving handle 33 includes a connecting section and a handle section that are perpendicular to each other. The upper end of the connecting section is hinged to the connecting arm 37, and the lower end of the connecting section is hinged to the upper end of the pressure rod 35. The rotation of the handle section drives the connecting section and the pressure rod 35 to move.

[0028] The drive handle 33 has an overall L-shaped structure. The drive handle 33 includes a connecting section and a handle section that are perpendicular to each other. The lower end of the connecting section is hinged to the pressure rod 35, and the upper end of the connecting section is hinged to the connecting arm 37. The upper end of the connecting arm 37 is hinged to the vertical cantilever 36. The rotation of the handle section of the drive handle 33 causes the connecting section to rotate accordingly. The movement of the connecting section causes the pressure rod 35 to reciprocate vertically within the guide sleeve 34. Of course, when this drive handle structure is used, when the connecting section and the pressure rod 35 are on the same straight line, the entire pressure rod 35 and the drive handle 33 form a self-locking structure, which facilitates the locking of the workpiece and ensures the stability and locking accuracy of the workpiece clamping.

[0029] In this embodiment, the adjusting rod assembly 4 includes an adjusting screw 41 and a limiting mounting sleeve 43. The limiting mounting sleeve 43 is fixedly installed on the pressure table mechanism 5. The adjusting screw 41 rotates through the limiting mounting sleeve 43 and is threadedly connected to the pressure rod 35.

[0030] The limiting mounting sleeve 43 is fixedly and locked onto the pressure table mechanism 5 by bolts, and is used to limit the installation of the adjusting screw 41. The upper end of the adjusting screw 41 is threadedly engaged with the pressure rod 35. By rotating the adjusting screw 41, the pressure table mechanism 5 can be adjusted in the vertical direction (i.e., Figure 1 The position of the vertical height direction shown in the figure is finely adjusted to ensure the clamping accuracy of the workpiece.

[0031] In this embodiment, the adjusting screw 41 has a screw boss 44 protruding from it, and the limiting mounting sleeve 43 has a screw mounting hole for installing the adjusting screw 41. The screw boss 44 is installed in the limiting mounting sleeve 43 and the limiting mounting sleeve 43 is used to axially limit the screw boss 44.

[0032] After the adjusting screw 41 passes through the limiting mounting sleeve 43, the upper end cooperates with the pressure rod 35 for threaded adjustment and installation. The lower end of the adjusting screw 41 is correspondingly formed with a screw boss 44 structure. The adjusting screw 41 and the pressure rod 35 are rotated to adjust the installation position between them. The limiting mounting sleeve 43 is used to axially limit the adjusting screw 41, but does not affect the internal rotation adjustment of the adjusting screw 41.

[0033] In this embodiment, the pressure rod 35 is machined with an internal thread to fit the adjusting screw 41, and a handwheel 42 for rotating the adjusting screw 41 is fixedly installed on the adjusting screw 41.

[0034] A handwheel 42 is fixedly installed on the outer circumference of the pressure rod 35. When the pressure rod 35 is pressed down to the appropriate position, the handwheel 42 can be rotated to further drive the pressure table mechanism 5 to press down, so as to achieve precise clamping of the workpiece.

[0035] In this embodiment, the pressing platform mechanism 5 includes a pressing platform 51, a pressing platform crossbeam 7 fixedly installed on the support frame 2, and guide rods 52 fixedly installed between the pressing platform crossbeam 7 and the base 1. There are two guide rods 52 arranged in parallel to each other, and the pressing platform 51 is slidably connected to the two guide rods 52.

[0036] The pressure table crossbeam 7 is fixedly installed between two vertical support plates. Two parallel guide rods are fixedly installed between the pressure table crossbeam 7 and the base 1, forming a guiding and supporting function for the pressure table 51. The pressure table 51 slides with the two guide rods 52 to ensure the stability of the overall structure and facilitate the clamping and adjustment of the workpiece.

[0037] In this embodiment, a guide hole is provided on the pressure table 51, and a guide sleeve 53 that is slidably installed in the guide hole to cooperate with the guide rod 52 is fixedly installed in the guide hole.

[0038] Guide holes are provided at both ends of the pressure table 51. The corresponding guide sleeves 53 are fixed and locked to the pressure table 51 by snap rings and are slidably installed in conjunction with the guide rod 52. Of course, the guide sleeves can be installed using linear bearings or other components that facilitate sliding.

[0039] In this embodiment, a pressing block assembly 6 is also included. The pressing block assembly includes an upper pressing block 61 installed at the lower end of the pressing table mechanism 5 and a lower pressing block 62 installed on the base 1. The upper pressing block 61 and the lower pressing block 62 have the same structure.

[0040] The pressure block assembly includes two identical upper pressure block 61 and lower pressure block 62. The upper pressure block 61 is fixedly installed on the lower surface of the pressure table 51 and located in the middle of the lower surface of the pressure table. The corresponding lower pressure block 62 is fixedly installed on the upper surface of the base 1. The two cooperate with each other to form a clamping effect on the workpiece.

[0041] In this embodiment, an arc-shaped groove 63 is formed in the middle of the pressing block 62, and a positioning inclined surface 64 is formed on the pressing block 62. There are two positioning inclined surfaces 64, and the two positioning inclined surfaces 64 are symmetrically distributed on the pressing block 62 with respect to the arc-shaped groove 63.

[0042] The lower pressure block 62 is fixedly installed on the base by bolts, and the lower pressure block 62 has a recessed arc groove 63 structure in the middle. The upper end of the lower pressure block 62 is also provided with two positioning inclined surfaces 64. The two positioning inclined surfaces are symmetrically distributed with respect to the arc groove 63. The two positioning inclined surfaces 64 and the arc groove 63 facilitate the effective positioning and clamping of tubular workpieces of different diameters, ensuring the stability of workpiece clamping. Of course, when clamping non-tubular workpieces, it is only necessary to replace the two corresponding pressure blocks, which is convenient, quick and easy to use.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A locking vise that is easy to operate, characterized in that: It includes a base (1), a support frame (2) fixedly installed on the base (1), a pressure rod mechanism fixedly installed on the support frame (2) and adjustable in height in the vertical direction, and a pressure table mechanism (5) fixedly installed at the lower end of the pressure rod mechanism. The pressure bar mechanism includes a telescopic pressure bar assembly (3) fixedly installed on the support frame (2) and an adjusting rod assembly (4) disposed between the telescopic pressure bar assembly (3) and the pressure table mechanism (5). The adjusting rod assembly (4) can adjust the distance between the pressure table mechanism (5) and the telescopic pressure bar assembly (3) in the vertical direction. The telescopic pressure bar assembly (3) drives the adjusting rod assembly (4) and the pressure table mechanism (5) to move synchronously in the vertical direction.

2. The easy-to-operate locking vise according to claim 1, characterized in that: The telescopic pressure bar assembly (3) includes a horizontal plate (31) fixedly installed with the support frame (2), a suspension fixedly installed on the horizontal plate (31), a guide sleeve (34) fixedly installed with the suspension, a pressure bar (35) slidably passing through the guide sleeve (34), and a drive mechanism fixedly installed on the suspension; the drive mechanism drives the pressure bar (35) and the adjusting rod assembly (4) to reciprocate linearly in the vertical direction.

3. The easy-to-operate locking vise according to claim 2, characterized in that: The drive mechanism includes a drive handle (33) and a connecting arm (37). The connecting arm (37) is hinged to the suspension. The drive handle (33) includes a connecting section and a handle section that are perpendicular to each other. The upper end of the connecting section is hinged to the connecting arm (37), and the lower end of the connecting section is hinged to the upper end of the pressure rod (35). The rotation of the handle section drives the connecting section and the pressure rod (35) to move.

4. The easy-to-operate locking vise according to claim 2, characterized in that: The adjusting rod assembly (4) includes an adjusting screw (41) and a limiting mounting sleeve (43). The limiting mounting sleeve (43) is fixedly installed on the pressure table mechanism (5). The adjusting screw (41) rotates through the limiting mounting sleeve (43) and is threadedly connected to the pressure rod (35).

5. The easy-to-operate locking vise according to claim 4, characterized in that: The adjusting screw (41) has a screw boss (44) protruding. The limiting mounting sleeve (43) has a screw mounting hole for installing the adjusting screw (41). The screw boss (44) is installed in the limiting mounting sleeve (43) and the limiting mounting sleeve (43) is used to axially limit the screw boss (44).

6. The easy-to-operate locking vise according to claim 4, characterized in that: A handwheel (42) for rotating the adjusting screw (41) is fixedly installed on the adjusting screw (41).

7. The easy-to-operate locking vise according to claim 1, characterized in that: The pressing platform mechanism (5) includes a pressing platform (51), a pressing platform crossbeam (7) fixedly installed on the support frame (2), and a guide rod (52) fixedly installed between the pressing platform crossbeam (7) and the base (1). The guide rod (52) consists of two rods arranged in parallel to each other, and the pressing platform (51) is slidably connected to the two guide rods (52).

8. The easy-to-operate locking vise according to claim 7, characterized in that: The pressure table (51) has a guide hole, and a guide sleeve (53) that is slidably installed in the guide hole to cooperate with the guide rod (52) is fixedly installed.

9. The easy-to-operate locking vise according to claim 1, characterized in that: It also includes a pressure block assembly, which includes an upper pressure block (61) installed at the lower end of the pressure table mechanism (5) and a lower pressure block (62) installed on the base (1). The upper pressure block (61) and the lower pressure block (62) have the same structure.

10. The easy-to-operate locking vise according to claim 9, characterized in that: An arc-shaped groove (63) is formed in the middle of the pressing block (62), and a positioning inclined surface (64) is formed on the pressing block (62). There are two positioning inclined surfaces (64), and the two positioning inclined surfaces (64) are symmetrically distributed on the pressing block (62) with respect to the arc-shaped groove (63).

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