Fluid nozzle product interference assembly jig

Abstract

The utility model provides a kind of fluid nozzle product interference assembly fixture, including workbench and fixture, the workbench upper end surface fixed connection guide rod, guide rod upper end inserts the fixed clamping hole on mounting plate and realizes interference connection, and cylinder is fixedly installed on mounting plate;The fixture is fixed on the workbench upper end surface, and the fixture includes lower plate and upper plate, and the lower plate upper end surface center is equipped with positioning hole;The piston rod bottom of the cylinder is fixedly connected with punch, and punch passes through the center of fixture upper plate in vertical direction.This utility model, by setting outer circle positioning hole and punch cooperation driven by cylinder, to realize positioning with the lower plate positioning hole of fixture adaptation fluid nozzle outer circle, limit nozzle product in radial, axial arbitrary movement, while using cylinder to drive punch to pass through upper plate center through-hole and press down, steel ball is stably pressed into workpiece hole, effectively avoid alignment deviation when artificial assembly, ensure the position accuracy and interference fit effect of steel ball assembly process.

Description

Technical Field

[0001] This utility model relates to the field of nozzle steel ball assembly technology, specifically an interference fit assembly fixture for fluid nozzle products. Background Technology

[0002] Fluid nozzles are core components used to precisely control the direction, flow rate, atomization effect, or velocity of fluids (such as liquids and gases). Their structural precision directly determines the fluid control effect and significantly impacts the operating efficiency and product quality of downstream equipment. In the assembly process of fluid nozzles, steel balls need to be pressed into the nozzle orifice to seal the fluid channel, prevent leakage, or position internal components.

[0003] However, current assembly of fluid nozzles and steel balls relies on traditional manual operation or simple tooling. Manual assembly requires operators to manually align the nozzle and steel ball, then press the steel ball with a manual tool to complete the assembly. This not only makes it difficult to ensure the coaxiality of the nozzle and steel ball, leading to inaccurate product positioning and causing the steel ball to shift and be pressed in, resulting in damage to the nozzle orifice wall or improper assembly of the steel ball; but also makes it difficult to control the manual pressing force. Too little force will prevent the steel ball from achieving an effective interference fit, leading to loosening and leakage later. Too much force can cause product cracking, steel ball breakage, and other appearance and structural damage, resulting in a high defect rate. Furthermore, each assembly is time-consuming, making it difficult to meet the needs of mass production, resulting in low efficiency and increased labor costs. Utility Model Content

[0004] The purpose of this invention is to provide an interference fit assembly fixture for fluid nozzle products to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An interference fit jig for a fluid nozzle product includes: A workbench is provided, with a guide rod fixedly connected to the upper surface of the workbench. The upper end of the guide rod is inserted into a fixing hole on the mounting plate to achieve an interference fit. The mounting plate is suspended above the workbench, and a cylinder is fixedly mounted on the mounting plate. A clamp is fixed on the upper surface of a workbench. The clamp includes a lower plate and an upper plate. A positioning hole is provided at the center of the upper surface of the lower plate for fixing the fluid nozzle product. The piston rod of the cylinder is fixedly connected to the punch. The punch passes through the center of the upper plate of the fixture in a vertical direction, and the axis of the punch is collinear with the axis of the positioning hole on the lower plate. The workpiece is positioned by the fixture, and the cylinder drives the punch to press down, so that the steel ball is driven into the hole of the workpiece, ensuring that the ball is pressed in smoothly with uniform force.

[0006] Preferably, the upper and lower plates of the fixture are connected at both ends by vertical plates. The upper and lower ends of the vertical plates are fixedly connected to the upper and lower plates by bolts, respectively. The lower plate has fixing holes at both ends, which correspond to the positions of the fixing blocks on the worktable. Bolts are passed through the fixing holes at both ends of the lower plate and threadedly connected to the fixing blocks, so that the lower plate is stably fixed on the worktable, preventing the fixture from shifting during the punch pressing assembly process. At the same time, it is convenient to remove the bolts and replace the lower plate with a suitable one according to the assembly requirements of different specifications of workpieces.

[0007] Preferably, a convex groove is provided on the worktable, extending through the table surface. The width of the groove opening matches the width of the fixing block, and the depth of the groove matches the lower height of the fixing block. The fixing block has a convex structure and can slide into the groove from one side of the worktable along the extension direction of the groove, achieving initial engagement and positioning between the fixing block and the groove. The fixing block can slide freely along the length of the groove and can be flexibly adjusted in position within the groove according to the size of the fixing holes at both ends of the lower plate of the fixture, aligning the fixing block with the fixing holes. After the fixing block is positioned, a bolt is passed through the fixing hole of the lower plate of the fixture and threadedly connected to the threaded hole on the upper end face of the fixing block. Tightening the bolt secures the lower plate and the fixing block, thus achieving stable installation of the fixture on the worktable. Furthermore, when changing to different specifications of fixtures or adjusting the position of the fixture, simply loosening the bolt allows the fixing block to slide along the groove, making the operation convenient and providing high positioning accuracy.

[0008] Preferably, the mounting plate is provided with fixing holes, which are fitted onto the outside of the guide rod, and the fixing holes are provided with locking bolts. Tightening the locking bolts can fix the mounting plate on the guide rod, adjust the initial distance between the punch and the lower plate, and adapt to workpieces of different heights and sizes.

[0009] Preferably, the bottom of the cylinder piston rod is fixedly connected to an adapter, and the upper side wall of the adapter is provided with a connection hole. The upper end of the punch is inserted into the adapter and is fixed to the punch by passing through the connection hole with a set screw. Punches of different diameters can be quickly replaced by removing the set screw to adapt to the assembly of steel balls of different sizes.

[0010] Preferably, the bottom of the workbench is provided with an anti-slip rubber pad, on which uniformly distributed anti-slip patterns are formed; the anti-slip rubber pad increases the friction between the workbench and the ground, preventing the workbench from shifting due to the impact force of the cylinder during the operation of the fixture, thus ensuring assembly accuracy.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention utilizes an outer circular positioning hole that engages with a cylinder-driven punch. The positioning hole on the lower plate of the fixture is adapted to the outer circle of the fluid nozzle to achieve positioning, thus restricting the nozzle from moving arbitrarily in the radial and axial directions. Simultaneously, the cylinder drives the punch to pass through the central through hole of the upper plate and press down, stably pressing the steel ball into the workpiece hole. This effectively avoids alignment deviations during manual assembly and ensures the positional accuracy and interference fit effect of the steel ball assembly process.

[0012] This invention eliminates the need for manual alignment by setting positioning holes on the lower plate of the fixture and using a punch on the upper plate. This significantly reduces manual intervention steps and eliminates the tedious traditional manual pressing assembly, saving labor time and improving assembly efficiency per cycle. Furthermore, the punch and positioning hole are strictly collinear, and the stable pressure output of the cylinder further ensures positioning accuracy, reducing product damage, steel ball cracking, and other defects, indirectly reducing rework costs and improving overall production efficiency.

[0013] This utility model, by setting a "convex" shaped slot and a sliding fixing block, combined with the height adjustment structure of the mounting plate, allows the lower plate of the fixture to be flexibly adjusted along the slot. The mounting plate can be fixed at any height of the guide rod by locking bolts, adapting to the assembly requirements of fluid nozzles of different specifications. At the same time, the punch is detachably connected to the set screw through an adapter, which facilitates the replacement of punches of different diameters without the need for overall modification of the fixture or cylinder, greatly expanding the equipment's adaptability range and reducing the equipment adjustment cost for producing multi-specification products. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Another perspective 3D illustration; Figure 3 This is a three-dimensional schematic diagram of the workbench and cylinder of this utility model; Figure 4 This is a three-dimensional schematic diagram of the fixture and punch of this utility model; Figure 5 This utility model Figure 5 Another perspective 3D illustration; Figure 6 This is a three-dimensional schematic diagram of the cooperation between the fixing block and the worktable slot of this utility model.

[0015] In the diagram: 1. Workbench; 101. Slot; 102. Fixing block; 2. Guide rod; 3. Mounting plate; 301. Fixing hole; 4. Cylinder; 401. Piston rod; 402. Adapter; 403. Connecting hole; 5. Punch; 6. Upper plate; 7. Lower plate; 701. Fixing hole; 702. Positioning hole; 8. Vertical plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] A fluid nozzle is a precision component used to control the direction, flow rate, shape, or atomization effect of fluid (such as liquid or gas) spray. Primarily used in spraying systems, its structure typically includes core components such as fluid channels and nozzles. Precise design ensures a stable fluid output as required. The insertion of steel balls into fluid nozzles is mainly based on sealing, positioning, or functional adaptation needs. On one hand, the steel balls act as seals or check valves within the nozzle's internal fluid channels. Through interference fit, they tightly conform to the nozzle orifice, preventing fluid leakage from unexpected locations under pressure and ensuring that fluid is only output from the designated nozzle, thus improving the nozzle's sealing performance and operational reliability. On the other hand, some nozzles require steel balls to position or limit internal components, ensuring that each component maintains a relatively stable positional relationship during fluid impact or long-term use. This prevents deviations in spray effect due to component displacement, thereby guaranteeing the overall working accuracy and service life of the nozzle.

[0018] Example: Please see Figures 1 to 6 This utility model provides a technical solution: An interference fit assembly fixture for a fluid nozzle product includes a worktable 1, a guide rod 2, a mounting plate 3, a cylinder 4, a punch 5, and a fixture. The components work together to achieve interference fit assembly of the fluid nozzle and the steel ball.

[0019] The bottom of the worktable 1 is equipped with an anti-slip rubber pad, and the surface of the rubber pad has evenly distributed anti-slip patterns. This anti-slip design can significantly increase the friction between the worktable 1 and the ground, preventing the worktable 1 from shifting due to impact force when the clamp is driven by the cylinder 4 to press down the punch 5, thus ensuring the positional accuracy of the steel ball assembly process.

[0020] A guide rod 2 is fixedly connected to the upper surface of the workbench 1. The guide rod 2 is set perpendicular to the surface of the workbench 1, and its upper end is inserted into the pre-set fixing hole 301 on the mounting plate 3. The guide rod 2 and the fixing hole 301 are connected by an interference fit to ensure that the connection between the two is firm and without looseness, thereby suspending the mounting plate 3 horizontally above the workbench 1. A cylinder 4 is fixedly installed on the mounting plate 3. The output direction of the cylinder 4 is vertically downward, providing stable downward pressure for the assembly of steel balls.

[0021] The mounting plate 3 has a locking bolt (not shown in the figure) on the outside of the fixing hole 301. Tightening the locking bolt can fix the mounting plate 3 at any height position of the guide rod 2. By adjusting the height of the mounting plate 3, the initial distance between the punch 5 and the lower clamp can be flexibly changed, thereby adapting to the assembly requirements of fluid nozzle products of different heights and sizes.

[0022] It should be noted that cylinder 4 is preferably the Airtac SGJ160x100 model. This model of cylinder 4 has a cylinder diameter of 160mm and a stroke of 100mm. Its output force can be precisely controlled by adjusting the air pressure according to the assembly requirements. It can provide sufficient pressure for the interference fit between the fluid nozzle and the steel ball, ensuring that the steel ball is smoothly pressed into the workpiece hole, while avoiding product damage or steel ball cracking due to excessive pressure. The 100mm stroke can fully meet the assembly requirements of fluid nozzle products with different heights and sizes. Combined with the height adjustment of the mounting plate 3 on the guide rod 2, it further expands the adaptability range of the fixture.

[0023] Cylinder 4 can be operated through two common control methods. The first is manual valve control, where the operator can manually adjust the valve to control the cylinder's air intake and exhaust, thus achieving the extension and retraction of the piston rod. This is suitable for small-batch trial production or temporary assembly adjustments. The second is PLC control. By connecting the cylinder to the PLC control system, cylinder action parameters in the assembly process (such as depressurization speed and holding time) can be preset, achieving automated start / stop and precise motion control, adapting to the needs of large-scale continuous production. Both the manual valve control and PLC control methods are existing, publicly available technologies in the field of mechanical automation. Specific details regarding valve group structure, PLC programming logic, and signal connection methods, such as those found in "Design and Testing Verification of PLC-Based Stroke Adjustable Cylinder Control," *Mechanical and Electrical Engineering Technology*, 2024, No. 11, pp. 310-312, 323, etc., will not be elaborated here.

[0024] The fixture is fixed to the upper surface of the workbench 1 and includes a lower plate 7 and an upper plate 6, which are arranged in parallel and connected by a vertical plate 8. There are two vertical plates 8, corresponding to the two ends of the lower plate 7 and the upper plate 6 respectively. The upper end face of the vertical plate 8 is in contact with the lower end face of the upper plate 6, and the lower end face is in contact with the upper end face of the lower plate 7. They are fixed together by bolts, so that the upper plate 6, the lower plate 7 and the vertical plate 8 form an integral frame structure, which ensures the structural strength of the fixture and ensures the coaxiality of the center hole of the upper plate 6 and the positioning hole 702 of the lower plate 7.

[0025] A positioning hole 702 is provided at the center of the upper end face of the lower plate 7. The size of the positioning hole 702 is adapted to the outer diameter of the fluid nozzle product. The fluid nozzle product can be embedded in the positioning hole 702 to achieve precise positioning and prevent radial displacement of the product during assembly. Fixing holes 701 are also provided at both ends of the lower plate 7. The fixing holes 701 correspond to the positions of the fixing blocks 102 on the worktable 1. By passing bolts through the fixing holes 701 of the lower plate 7 and threadedly connecting them to the threaded holes on the upper end face of the fixing blocks 102, the lower plate 7 can be stably fixed on the worktable 1, preventing the fixture from shaking when the punch 5 is pressed down.

[0026] In this embodiment, to accommodate the installation and position adjustment of fixtures of different specifications, a convex groove 101 extending through the workbench 1 is provided. The groove 101 extends along the upper surface of the workbench 1, and its width matches the width of the fixing block 102, while its depth matches the height of the fixing block 102. The corresponding fixing block 102 is designed with a convex structure, allowing it to slide into the groove 101 from one side of the workbench 1 along its extension direction, achieving initial engagement and positioning between the fixing block 102 and the groove 101. The fixing block 102 can also slide freely along the length of the groove 101. When installing the fixture, the fixing block 102 can be pushed into the groove 101 to align with the fixing holes 701 at both ends of the lower plate 7, and then locked with bolts. This not only meets the fixing requirements of fixtures of different specifications but also facilitates subsequent adjustment of fixture positions or replacement of fixtures, making the operation convenient and the positioning accuracy high.

[0027] The piston rod 401 of the cylinder 4 is fixedly connected to an adapter 402 at its bottom. The adapter 402 is a hollow structure with a horizontal connection hole 403 on its outer side wall. The upper end of the punch 5 is inserted into the hollow cavity of the adapter 402. A set screw passes through the connection hole 403 of the adapter 402 and is pressed against the side wall of the punch 5, thus achieving a detachable connection between the punch 5 and the piston rod 401. When it is necessary to assemble steel balls of different sizes, only the set screw needs to be removed to remove the old punch 5 and replace it with a new punch 5 of the corresponding diameter and fixture. There is no need to replace the entire cylinder 4 or the adapter 402, which greatly reduces the equipment adjustment cost and improves the assembly versatility.

[0028] In this embodiment, the punch 5 is arranged vertically, with its lower end passing through a pre-set through hole in the center of the upper plate 6 of the fixture. The axis of the punch 5 is completely collinear with the axis of the positioning hole 702 in the lower plate 7, ensuring that the punch 5 accurately aligns with the assembly position of the fluid nozzle product within the positioning hole 702 when it presses down. During assembly, the cylinder 4 drives the piston rod 401 to extend downwards, causing the punch 5 to press down synchronously. The punch 5 smoothly presses the steel ball into the hole of the fluid nozzle. Because the axis of the punch 5 is precisely aligned with the product hole, and the downward pressure provided by the cylinder 4 is stable and controllable, the steel ball is subjected to uniform force, avoiding problems such as steel ball cracking or incomplete assembly, thus achieving a smooth pressing-in assembly effect.

[0029] It should be noted that the core of the fixture adopts the workpiece outer circle positioning method. The cylindrical outer circle surface of the fluid nozzle product is tightly fitted with the inner wall of the positioning hole 702 in the center of the lower plate 7 of the fixture. Through the matching fit between the outer circle and the positioning hole 702, the product is stably positioned on the lower plate 7 of the fixture. For other specifications of products, fixtures of compatible specifications can be used. The positioning structure can spatially restrict the arbitrary movement of the product in the left-right radial, front-back radial, and up-down axial directions, effectively preventing the product from shifting or shaking during assembly, thereby achieving high-precision positioning of the product. On this basis, the punch 5 passes through the central through hole of the upper plate 6 of the fixture vertically, and the axis of the punch 5 is strictly collinear with the axis of the positioning hole 702 of the lower plate 7, ensuring that the punch 5 is always aligned with the hole of the steel ball to be assembled on the product.

[0030] During assembly, the cylinder 4 on the mounting plate 3 is activated. The cylinder 4 drives the piston rod 401 to extend downward, which in turn drives the punch 5 to press down synchronously. The stable preset pressure provided by the cylinder 4 accurately presses the steel ball into the product hole. The preset positioning structure can ensure that the assembly size meets the design requirements and can also avoid appearance problems such as product damage and steel ball cracking caused by alignment deviation during manual assembly.

[0031] Meanwhile, the coordinated operation of the fixture and cylinder 4 eliminates the need for manual alignment and positioning, significantly reducing manual intervention steps and saving labor time. Furthermore, the pressure of cylinder 4 can be flexibly adjusted according to the size of the steel ball and the material of the product. Setting a suitable preset pressure ensures that the steel ball is subjected to uniform force when the punch 5 is pressed down, maintaining a smooth pressing assembly state and further improving assembly quality and efficiency.

[0032] In this embodiment, the steel ball can be lubricated before being pressed in, for example, by impregnating it with a lubricant such as light machine oil or special grease. A suitable preset pressure is set: for example, a φ3mm stainless steel ball is pressed into a brass valve seat with an interference fit of 5μm, and the pressing pressure is within the range of 50N ~ 150N (approximately 5kgf ~ 15kgf).

[0033] It should be further explained that when meeting the assembly requirements of fluid nozzles of different specifications, there is no need to make complex adjustments to the overall structure of the fixture. Each adjustment only requires adjusting the relative position of the lower plate 7 of the fixture and the worktable 1. Since the worktable 1 has a through "convex" shaped slot 101, and the lower plate 7 of the fixture is connected to the slot 101 through the fixing block 102, the operator only needs to loosen the locking bolt between the lower plate 7 and the fixing block 102, and push the fixing block 102 to slide along the length of the slot 101, which will drive the lower plate 7 to move synchronously until the positioning hole 702 of the lower plate 7 is precisely aligned with the axis of the punch 5. After the position is determined, the bolts are tightened to complete the fixation. The entire adjustment process does not require disassembling a large number of parts, and the operation steps are simple and convenient. Relying on the cooperation of the slot 101 and the fixing block 102, it can be ensured that the lower plate 7 can be stably maintained in the preset position after each adjustment, with reliable positioning accuracy, effectively avoiding the problem of assembly dimension deviation caused by adjustment deviation, and further ensuring the consistency of product quality from the adjustment stage. Meanwhile, compared to the traditional method of machine adjustment that requires complete disassembly and recalibration of fixtures, this design significantly shortens the adjustment time and reduces equipment downtime. Combined with the automated assembly action driven by cylinder 4, it improves overall production efficiency and is especially suitable for scenarios involving batch production of multiple product specifications.

[0034] In use, this utility model first completes the preliminary preparation according to the specifications of the fluid nozzle to be assembled. When adjustment is required, loosen the locking bolts of the lower plate 7 of the fixture and the fixing block 102, push the fixing block 102 to slide along the "convex" groove 101 of the worktable 1 until the positioning hole 702 of the lower plate 7 is aligned with the axis of the punch 5, and then re-lock it. At the same time, adjust the height of the mounting plate 3 to match the height of the product. If the size of the steel ball changes, disassemble the adapter 402 and replace the corresponding punch 5 with the set screw and fix it. Then, perform the loading and positioning. Embed the fluid nozzle into the positioning hole 702 of the lower plate 7 and fix it accurately with the outer circle. Then place the steel ball above the hole to be assembled on the product. Then, start the cylinder 4. The piston rod 401 of the cylinder 4 drives the punch 5 to pass through the center through hole of the upper plate 6 and press it down smoothly. With a stable preset pressure, press the steel ball into the product hole with interference to avoid cracking or improper assembly. Finally, the cylinder 4 drives the punch 5 to reset. The operator takes out the assembled fluid nozzle and can enter the next loading and assembly cycle.

[0035] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies, or can be implemented using existing technologies, and will not be described in detail here.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An interference fit jig for fluid nozzle products, characterized in that, include: Workbench (1), the upper end face of the workbench (1) is fixedly connected to guide rod (2), the upper end of guide rod (2) is inserted into the fixing hole (301) on the mounting plate (3) to achieve interference connection, the mounting plate (3) is suspended above the workbench (1), and the cylinder (4) is fixedly installed on the mounting plate (3). The fixture is fixed on the upper surface of the workbench (1). The fixture includes a lower plate (7) and an upper plate (6). A positioning hole (702) is provided at the center of the upper surface of the lower plate (7) for fixing the fluid nozzle product. The bottom of the piston rod (401) of the cylinder (4) is fixedly connected to the punch (5). The punch (5) passes through the center of the upper plate (6) of the fixture in a vertical direction, and the axis of the punch (5) is collinear with the axis of the positioning hole (702) on the lower plate (7). The workpiece is positioned by the fixture, and the cylinder (4) drives the punch (5) to press down, so that the steel ball is driven into the workpiece hole, ensuring that the ball is evenly stressed and smoothly pressed in.

2. The interference fit assembly fixture for a fluid nozzle product according to claim 1, characterized in that: The upper plate (6) and lower plate (7) of the fixture are connected at both ends by vertical plates (8). The upper and lower ends of the vertical plates (8) are fixedly connected to the upper plate (6) and lower plate (7) by bolts. The lower plate (7) has fixing holes (701) at both ends. The fixing holes (701) correspond to the fixing blocks (102) on the worktable (1). The lower plate (7) is stably fixed on the worktable (1) by bolts passing through the fixing holes (701) at both ends of the lower plate (7) and threadedly connected to the fixing blocks (102).

3. The interference fit assembly fixture for a fluid nozzle product according to claim 2, characterized in that: The workbench (1) has a convex groove (101) that runs through the surface. The fixing block (102) is a convex structure and can slide into the groove (101) from one side of the workbench (1) along the extension direction of the groove (101). The fixing block (102) can slide freely along the length of the groove (101) so that the fixing block (102) is aligned with the fixing hole (701). The fixing hole (701) of the fixture is passed through the fixing hole (701) of the lower plate (7) of the fixture by bolts and threadedly connected to the threaded hole on the upper end face of the fixing block (102) to achieve a stable installation of the fixture on the workbench (1).

4. The interference fit assembly fixture for a fluid nozzle product according to claim 1, characterized in that: The mounting plate (3) is provided with a fixing hole (301), which is sleeved on the outside of the guide rod (2), and a locking bolt is provided on the fixing hole (301). Tightening the locking bolt can fix the mounting plate (3) to the guide rod (2).

5. The interference fit assembly fixture for a fluid nozzle product according to claim 1, characterized in that: The piston rod (401) of the cylinder (4) is fixedly connected to an adapter (402). The upper side wall of the adapter (402) is provided with a connection hole (403). The upper end of the punch (5) is inserted into the adapter (402) and is pressed against the punch (5) by the top screw passing through the connection hole (403).

6. The interference fit assembly fixture for a fluid nozzle product according to claim 1, characterized in that: The bottom of the workbench (1) is provided with an anti-slip rubber pad, and the anti-slip rubber pad is provided with uniformly distributed anti-slip patterns; the anti-slip rubber pad increases the friction between the workbench (1) and the ground, and prevents the workbench (1) from shifting due to the impact force of the cylinder (4) when the clamp is working.

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