A machine tool table clamping structure

Abstract

This invention provides a machine tool worktable clamping structure, belonging to the field of machine tool fixture technology. The machine tool worktable clamping structure includes a machine tool and a worktable disposed inside the machine tool, and further includes a bonding unit. The bonding unit includes a guide block slidably disposed on the worktable, a mounting support slidably disposed on the guide block, a locking ball seat fixedly connected to the mounting support near the workpiece, a plurality of locking jaws disposed on the locking ball seat, a universal ball rotatably disposed between the locking jaws, and a bonding block disposed on the side of the universal ball away from the locking ball seat. By setting the bonding unit, this invention can bond the outer surfaces of different workpieces, increasing the contact area and ensuring sufficient clamping force during clamping. By setting the auxiliary fixing unit, it ensures that the support block can provide additional pressure and act on the workpiece surface, better bonding the outer surface structure of different workpieces and preventing workpiece vibration or displacement during processing.

Description

Technical Field

[0001] This invention belongs to the field of machine tool fixture technology, and specifically relates to a machine tool worktable clamping structure. Background Technology

[0002] The machine tool table is a key component of a machine tool, used to mount and fix workpieces and support them in completing machining operations. The machine tool table clamping structure is a mechanical device used to firmly fix the workpiece or fixture during machining. Its core function is to provide a stable and reliable clamping force, preventing workpiece displacement or vibration under cutting forces. This structure directly affects machining accuracy, efficiency, and safety, making it a critical component of the machine tool.

[0003] Chinese patent CN120619914B discloses a rotary clamping fixture for CNC machine tools, including a machine tool body. The machine tool body has an internal worktable for placing workpieces, and a clamping plate for holding the workpieces is located on the upper side of the worktable. In this rotary clamping fixture, a sliding rod moves under the action of an abutment groove. Under the limiting action of the groove, the sliding rod slides towards the center of the worktable, thereby clamping and limiting the workpiece to prevent positional displacement during processing and affecting the processing effect. When the electromagnetic coil is energized, it generates a ring-shaped magnetic field. The magnetic block interacts with the magnetic field of the electromagnetic coil, causing the swing frame to periodically swing along the outer side of the limiting axis. A striking hammer strikes the vibrating plate, transmitting the vibration force to the inner wall of the machine tool body, thus preventing flying debris from adhering to the inner wall of the machine tool body.

[0004] However, the above technical solution still has the following problems: when clamping the workpiece, because the clamping plate moves synchronously and the expansion degree of the auxiliary airbag is related to the moving distance of the clamping plate, the clamping plate can only clamp workpieces with regular planes or fixed dimensions. For workpieces with complex curved surfaces, cast blank surfaces or irregular shapes, the structure cannot make effective contact and cannot fully adapt to workpieces with different shapes. Moreover, after the auxiliary airbag contacts the workpiece, the clamping force provided is unstable, which can easily lead to insufficient or excessive clamping force, affecting the workpiece processing quality. Summary of the Invention

[0005] The purpose of this invention is to provide a machine tool worktable clamping structure, which aims to solve the problem in the prior art that the clamping structure cannot be fully adapted to workpieces of different shapes, which easily leads to unstable clamping force when clamping the workpiece.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a machine tool worktable clamping structure, comprising: a machine tool and a worktable disposed inside the machine tool, and further comprising: The bonding unit is slidably mounted on the worktable. The bonding unit includes a guide block slidably mounted on the worktable. A mounting support is slidably mounted on the guide block. A locking ball seat is fixedly connected to the side of the mounting support near the workpiece. Multiple locking claws are provided on the locking ball seat. A universal ball is rotatably mounted between the locking claws. A bonding block is provided on the side of the universal ball away from the locking ball seat. A first elastic element for resetting the bonding block is provided on the bonding block. A fixing unit is set on the fitting unit. The fixing unit includes a limiting cylinder set on the guide block, a mounting support slidably set on the limiting cylinder, a guide slope set on the outer side of the locking claw, and the side of the limiting cylinder away from the guide block can contact the guide slope. A second elastic element for its reset is set on the locking ball seat. An auxiliary fixing unit is installed on the bonding unit. The auxiliary fixing unit includes a hydraulic chamber installed inside the bonding block. Multiple sets of sliding cavities are arranged through the hydraulic chamber. Sliding columns are slidably connected inside the sliding cavities. A support block is installed at one end of each sliding column.

[0007] A further technical solution of the present invention is that the bonding unit is provided in multiple sets, a guide groove is provided on the worktable, the guide block slides with the guide groove, a driving device is provided at the bottom of the worktable that can drive the guide block to slide back and forth along the guide groove, the sliding direction of the mounting support is consistent with the moving direction of the corresponding guide block, and the two ends of the first elastic element are respectively connected to the bonding block and the mounting support. In this embodiment, the first elastic element is set as a torsion spring.

[0008] Its effect is to control the bonding block to approach the workpiece and adhere to the outer surface of the workpiece, while controlling the initial angle of the bonding block through the first elastic element.

[0009] A further technical solution of the present invention is that the locking ball seat is slidably disposed on the side away from the universal ball inside the limiting cylinder, so that the side of the locking claw near the mounting support can be accommodated in the limiting cylinder. A through groove is provided on the side of the limiting cylinder so that the connection position between the locking ball seat and the mounting support can pass through the through groove. The guide slopes on the locking claw are close to each other at the end near the mounting support and far away from each other at the end away from the mounting support, forming a flared guide cone surface.

[0010] Its effect is to ensure that when the limiting cylinder slides relative to the locking claw, it can squeeze the guide slope and retract the locking claw, thereby increasing the friction between the locking claw and the universal ball and preventing the universal ball from rotating.

[0011] A further technical solution of the present invention is that the two ends of the second elastic element are respectively connected to the end of the locking ball seat away from the universal ball and the inside of the limiting cylinder. In this embodiment, the second elastic element is set as a compression spring.

[0012] A further technical solution of the present invention is that the top of the bonding block is provided with a liquid inlet pipe, which is connected to the hydraulic chamber, the sliding column penetrates the side of the bonding block away from the universal ball and extends to the outside of the bonding block, and the support block is provided outside the bonding block.

[0013] A further technical solution of the present invention is that two main clamping surfaces are horizontally arranged on both sides of the bonding block, the main clamping surfaces are arranged on the same side as the support block, and the hydraulic chamber is arranged between the two main clamping surfaces.

[0014] Its effect is that the support block is used to assist in the clamping and fixing of the main clamping surface, and to help fit the outer surface of the workpiece that cannot be clamped by the main clamping surface.

[0015] A further technical solution of the present invention is that the bonding unit is provided with a bidirectional flow unit, the bidirectional flow unit includes air guide pipes provided on both sides of the bonding block, multiple air guide ports are provided on the main clamping surface, the air guide ports are connected to the air guide pipes, a flow detection device is provided on the air guide pipes, and an air pump is provided inside the machine tool.

[0016] A further technical solution of the present invention is that a sensor is provided on the guide block, and an indicator plate is provided on the mounting support to cooperate with the sensor. The sensor is used to detect the relative position between the mounting support and the guide block.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting up a bonding unit, the present invention can bond the outer surface of different workpieces, increase the contact area and ensure sufficient clamping force during clamping. By setting up an auxiliary fixing unit, the support block can provide additional pressure and act on the workpiece surface, better bonding the outer surface structure of different workpieces and preventing workpiece vibration or displacement during processing.

[0018] 2. By setting up a bidirectional flow unit, the surface of the workpiece can be cleaned before clamping, and the workpiece surface can be adsorbed during clamping to provide auxiliary limiting and prevent the workpiece from shaking during the fixing process; at the same time, the workpiece can be detected to see if it is shaking during processing, and additional support can be provided through the auxiliary fixing unit if it is shaking. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the workbench and bonding unit in a specific embodiment of the present invention; Figure 3This is a partial structural diagram of the workbench in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the bonding unit in a specific embodiment of the present invention; Figure 5 This is a partial structural diagram of the bonding unit in a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the mounting bracket in a specific embodiment of the present invention; Figure 7 This is a schematic diagram of the mating structure of the guide block, mounting support, and fitting block in a specific embodiment of the present invention; Figure 8 This is a schematic diagram of the internal structure of the bonding block in a specific embodiment of the present invention; Figure 9 This is a cross-sectional view of the bonding block in a specific embodiment of the present invention; Figure 10 for Figure 9 A magnified schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. Machine tool; 2. Worktable; 21. Guide groove; 22. Drive device; 3. Fitting unit; 31. Guide block; 32. Mounting support; 33. Locking ball seat; 331. Locking claw; 332. Guide slope; 34. Universal ball; 35. Fitting block; 351. Main clamping surface; 36. First elastic element; 4. Fixing unit; 41. Limiting cylinder; 42. Second elastic element; 5. Auxiliary fixing unit; 51. Hydraulic chamber; 511. Sliding cavity; 52. Liquid inlet pipe; 53. Sliding column; 54. Support block; 6. Bidirectional flow unit; 61. Air guide pipe; 62. Air guide port; 63. Flow detection device; 7. Sensor; 71. Indicator plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-10 The present invention provides the following technical solution: a machine tool worktable clamping structure, including a machine tool 1, a worktable 2, a bonding unit 3, a fixing unit 4, an auxiliary fixing unit 5, and a bidirectional flow unit 6.

[0023] Machine tool 1 is placed horizontally on the ground. Worktable 2 is located inside machine tool 1, and the workpiece to be processed can be placed on worktable 2. Multiple sets of contact units 3 are slidably arranged on worktable 2. Contact units 3 can move closer or further apart. When they move closer, they can contact and clamp the workpiece placed between them. Fixing units 4 are set on contact units 3. Fixing units 4 can fix the position of contact unit 3 with the workpiece, so that contact unit 3 can provide stable support for workpiece. Auxiliary fixing units 5 are set on contact units 3, which can further clamp and fix the workpiece. Bidirectional flow unit 6 is set on contact units 3. Bidirectional flow unit 6 can blow air to clean the surface of the workpiece when clamping it, and can assist the contact unit 3 in positioning the workpiece when clamping it, so as to avoid inaccurate positioning when clamping the workpiece.

[0024] like Figures 1-7 As shown, the bonding unit 3 includes a guide block 31 slidably disposed on the worktable 2. The worktable 2 is provided with a guide groove 21, and the guide block 31 slides in cooperation with the guide groove 21. A drive device 22 is provided at the bottom of the worktable 2, and the output end of the drive device 22 is connected to the guide block 31. The drive device 22 can drive the guide block 31 to slide back and forth along the guide groove 21, and the workpiece is placed between multiple guide blocks 31. A mounting support 32 is slidably disposed on the guide block 31. The sliding direction of the mounting support 32 is consistent with the moving direction of the corresponding guide block 31, so that the mounting support 32 can move along the sliding direction of the guide block 31. A locking ball seat 33 is provided on the side of the mounting support 32 near the workpiece. The locking ball seat 33 is fixedly connected to the mounting support 32. Multiple locking claws 331 are provided on the locking ball seat 33. Universal balls 34 are rotatably disposed between the locking claws 331, and the locking claws 331 lock and limit the universal balls 34. A fitting block 35 is provided on the side of the universal ball 34 away from the locking ball seat 33. When the universal ball 34 rotates inside the locking ball seat 33, the fitting block 35 can adjust its angle and direction accordingly. A first elastic element 36 is provided on the side of the fitting block 35 near the universal ball 34. The other end of the first elastic element 36 is connected to the mounting bracket 32. The first elastic element 36 can control the side of the fitting block 35 away from the universal ball 34 to return to its initial vertical position when no external force is applied. In this embodiment, the first elastic element 36 is a torsion spring.

[0025] During operation, the workpiece is first placed on the worktable 2, within the clamping area formed by multiple guide blocks 31. Then, the drive device 22 controls the guide blocks 31 to move closer together and approach the outer surface of the workpiece. The side of the contact block 35 away from the universal ball 34 then begins to contact the side of the workpiece. Since the outer surfaces of different workpieces are not perfectly uniform and flat, as the contact block 35 continues to approach the workpiece, the rotational engagement of the universal ball 34 and the locking ball seat 33 allows the side of the contact block 35 in contact with the workpiece to adjust its angle, ensuring that its side fits snugly against the outer surface of the workpiece. At this point, the first elastic element 36 is stressed and gradually deforms. This avoids the problem in existing equipment where, due to the workpiece's outer surface being a complex curved surface, a cast blank surface, or an irregular shape, only a single point or line contact can be formed during clamping, preventing complete contact and effective fixation. By incorporating the universal ball 34, the contact block 35 can effectively adapt to workpieces of different shapes.

[0026] like Figures 4-7 As shown, the fixing unit 4 includes a limiting cylinder 41 disposed on the guide block 31, a mounting support 32 slidably disposed on the limiting cylinder 41, and a locking ball seat 33 slidably disposed inside the limiting cylinder 41 on the side away from the universal ball 34. A through groove is provided on the side of the limiting cylinder 41 so that the connection position of the locking ball seat 33 and the mounting support 32 can pass through the through groove, ensuring that the locking ball seat 33 and the mounting support 32 can slide synchronously along the limiting cylinder 41. The locking claws 331 on the side near the universal ball 34 can approach each other and clamp the universal ball 34. The outer side of the locking claws 331 is provided with a guide slope 332. The guide slopes 332 on each locking claw 331 approach each other at the end near the mounting support 32 and move away from each other at the end away from the mounting support 32, thus forming a flared guide cone surface. The side of the locking claws 331 near the mounting support 32 can be accommodated in the limiting cylinder 41 together with the locking ball seat 33. The side of the limiting cylinder 41 away from the guide block 31 can contact the guide ramp 332. When the locking claw 331 moves towards the limiting cylinder 41, the guide ramp 332 on the outside of the locking claw 331 is subjected to the axial clamping force of the limiting cylinder 41, which will force it to generate a synchronous radial contraction movement, thereby clamping the central universal ball 34. The locking ball seat 33 is provided with a second elastic element 42 at one end away from the universal ball 34. The other end of the second elastic element 42 is connected to the inside of the limiting cylinder 41. The second elastic element 42 can control the locking ball seat 33 and the mounting support 32 to be located on the side of the limiting cylinder 41 away from the guide block 31 in the initial state. In this embodiment, the second elastic element 42 is set as a compression spring.

[0027] After the fitting block 35 is adjusted to the correct angle and fits against the outer surface of the workpiece, constrained by the reverse force of the workpiece, the universal ball 34 stops rotating. The guide block 31 can continue to push the mounting bracket 32. Through the movement of the guide block 31, the mounting bracket 32 ​​presses against the locking claw 331, thus locking the universal ball 34. The guide block 31 continues to approach the outer surface of the workpiece. At this time, the guide block 31 slides relative to the mounting bracket 32 ​​and compresses the second elastic element 42. The limiting cylinder 41 begins to slide along the guide slope 332 and... As the universal ball 34 approaches, after the limiting cylinder 41 contacts the guide slope 332, the locking claw 331 begins to retract and move closer to each other under the sliding cooperation of the guide slope 332 and the limiting cylinder 41, clamping the universal ball 34 between the locking claws 331 and restricting the rotation of the universal ball 34. At this time, the contact angle of the contact block 35 after rotation is completely locked, and the contact block 35 and the mounting support 32 are relatively stationary to form a whole, ensuring that the contact block 35 can completely fix the workpiece when the guide block 31 approaches the workpiece.

[0028] like Figure 4 and Figures 8-10 As shown, the auxiliary fixing unit 5 includes a hydraulic chamber 51 disposed within the bonding block 35. The hydraulic chamber 51 is located in the middle of the bonding block 35, and an inlet pipe 52 is provided at the top of the bonding block 35, which is connected to the hydraulic chamber 51. Multiple sets of sliding cavities 511 are disposed through the hydraulic chamber 51, and sliding columns 53 are slidably connected within the sliding cavities 511. The sliding columns 53 penetrate the side of the bonding block 35 away from the universal ball 34 and extend to the outside of the bonding block 35. A support block 54 is provided at one end of the sliding column 53, and the support block 54 is disposed outside the bonding block 35. The two sides of the bonding block 35 are horizontally provided with two main clamping surfaces 351, and the main clamping surfaces 351 and the support block 54 are located on the same side. The hydraulic chamber 51 is located between the two main clamping surfaces 351. When the sliding column 53 slides along the sliding cavity 511 and approaches the main clamping surface 351, the support block 54 can extend out from the inside of the main clamping surface 351 and its end gradually protrudes out of the main clamping surface 351.

[0029] After the workpiece is clamped and fixed by the contact block 35, hydraulic oil is introduced into the hydraulic chamber 51 through the inlet pipe 52. Under the pressure of the hydraulic oil, the sliding column 53 is pushed along the sliding cavity 511 to the side away from the hydraulic chamber 51, and the support block 54 contacts the outer surface of the workpiece. Because some workpieces have rough surfaces or are not smooth planes, they cannot fully fit with the main clamping surface 351, which can easily lead to unstable clamping. At this time, the support block 54 provides additional pressure and acts on the surface of the workpiece. Multiple support blocks 54 cooperate to fix and better fit the outer surface structure of different workpieces, preventing the workpiece from vibrating or shifting during processing. All sliding cavities 511 are connected to the hydraulic chamber 51, which can ensure that the pressure generated by the hydraulic oil is evenly applied to all sliding columns 53, and ensure that the clamping force applied by all support blocks 54 to fix the workpiece is the same.

[0030] like Figure 4 and Figures 7-10 As shown, the bidirectional flow unit 6 includes air guide pipes 61 disposed on both sides of the bonding block 35. Multiple air guide ports 62 are disposed on the main clamping surface 351, and the air guide ports 62 are connected to the air guide pipes 61. A flow detection device 63 is disposed on the air guide pipes 61, which can detect the flow rate and velocity of the gas flowing through the air guide pipes 61. An air pump (not shown in the figure) is disposed inside the machine tool 1, and the air pump is connected to the air guide pipes 61, enabling the air pump to blow or draw air into the air guide pipes 61.

[0031] like Figure 4 , Figure 6 and Figure 7 As shown, a sensor 7 is provided on the guide block 31. The sensor 7 can be configured as a magnetic induction displacement sensor. An indicator plate 71 that works in conjunction with the sensor 7 is provided on the mounting support 32. When the mounting support 32 slides back and forth along the guide block 31, the sensor 7 and the indicator plate 71 always correspond. The sensor 7 can detect the displacement of the mounting support 32 relative to the guide block 31, and thus determine when the bonding block 35 is fully bonded to the workpiece, as well as the degree of force on the second elastic member 42 when clamping the workpiece, to ensure that the bonding block 35 can apply sufficient clamping force to the workpiece.

[0032] When the workpiece is initially clamped, the mating block 35 approaches the side of the workpiece. At this time, air is blown into the air pipe 61 by the air pump and blown out from the air port 62. As the main clamping surface 351 gradually approaches the workpiece, the air blown out through the air port 62 can directly reach the outer surface of the workpiece being clamped, removing chips, dust, and coolant from the workpiece surface. This ensures that the main clamping surface 351 of the mating block 35 is not affected when it contacts and adheres to the workpiece, preventing loose adhesion, until the main clamping surface 351 and the workpiece are completely adhered. Subsequently, the guide block 31 continues to approach the workpiece, and the sensor 7 detects the displacement of the mounting bracket 32 ​​relative to the guide block 31 through the indicator plate 71. At this time, the air pump changes from blowing air to drawing air from the air pipe 61. If the main clamping surface 351 is completely adhered to the workpiece, the air port 62 contacts the workpiece and can form a negative pressure, making the mating block 35 adhere tightly to the workpiece. As the guide block 31 continues to move, it compresses the second elastic element 42 to the specified clamping force. It should be noted that the clamping force in this invention is characterized in real time by the compression stroke and compression deformation of the second elastic element 42 and matched with the actual clamping force. The correspondence between the deformation of the second elastic element 42 and the clamping force is determined through preliminary calibration tests, so that the standard clamping force specified by the process can be achieved by compressing to the preset deformation amount. The flow detection device 63 detects that there is no gas flow inside the air pipe 61 and it is kept in a negative pressure state when the guide block 31 moves, so as to ensure that the workpiece will not shake or shift when clamped. After clamping, the support block 54 provides auxiliary support to avoid the workpiece outer surface between the two main clamping surfaces 351 being uneven, which would cause the clamping to be unstable.

[0033] During subsequent workpiece processing, if the workpiece is affected by external forces such as cutting force or vibration, and the flow detection device 63 detects recoverable fluctuations or slight but continuous flow in the airflow within the air guide pipe 61, it indicates that the clamping force is slightly insufficient, resulting in a gap between the bonding block 35 and the workpiece. At this time, the clamping force of the bonding block 35 is kept constant while the clamping force of the support block 54 is increased. While the bonding block 35 provides a stable clamping force to the workpiece and prevents further shaking, the support block 54 increases the clamping force on the workpiece, reducing micro-chatter or bending caused by cutting force. This helps restore and maintain the seal between the bonding block 35 and the workpiece surface, ensuring stability during clamping. If the flow detection device 63 returns to its normal detection value, the bonding block 35 and the workpiece return to a mating state, and the support block 54 maintains its current clamping force.

[0034] If the workpiece surface is uneven, when the air pump switches from blowing to suction, the air inlet 62 cannot be completely blocked by the workpiece, creating a negative pressure. At this time, the main clamping surface 351 contacts the workpiece but cannot fully adhere to it. As the guide block 31 continues to move and compress the second elastic element 42 to the specified clamping force, the clamping force is increased when auxiliary support is provided by the support block 54. This allows the support block 54 to conform to the uneven outer surface of the workpiece, increasing the contact area with the workpiece while providing sufficient support. This prevents the problem of workpiece deformation caused by excessively large clamping force applied despite a small contact area between the main clamping surface 351 and the workpiece. Furthermore, multiple support blocks 54 are provided, allowing for adaptation and fitting of workpieces with different shapes, while providing sufficient and uniform support.

[0035] After processing is completed, the workpiece is released, and the second elastic element 42 pushes the mounting support 32 back to its initial state. The bonding block 35 also returns to its initial state under the action of the first elastic element 36, and then prepares to clamp the next workpiece.

Claims

1. A machine tool worktable clamping structure, comprising: The machine tool (1) and the worktable (2) disposed inside the machine tool (1) are characterized in that they further include: The bonding unit (3) is slidably disposed on the worktable (2). The bonding unit (3) includes a guide block (31) slidably disposed on the worktable (2). A mounting support (32) is slidably disposed on the guide block (31). A locking ball seat (33) is fixedly connected to the side of the mounting support (32) near the workpiece. Multiple locking claws (331) are disposed on the locking ball seat (33). A universal ball (34) is rotatably disposed between the locking claws (331). A bonding block (35) is disposed on the side of the universal ball (34) away from the locking ball seat (33). A first elastic element (36) for resetting the bonding block (35) is disposed on the bonding block (35). The fixing unit (4) is set on the fitting unit (3). The fixing unit (4) includes a limiting cylinder (41) set on the guide block (31), a mounting bracket (32) is slidably set on the limiting cylinder (41), a guide slope (332) is provided on the outer side of the locking claw (331), and the side of the limiting cylinder (41) away from the guide block (31) can contact the guide slope (332). A second elastic element (42) for its reset is provided on the locking ball seat (33). An auxiliary fixing unit (5) is set on the bonding unit (3). The auxiliary fixing unit (5) includes a hydraulic chamber (51) set in the bonding block (35). Multiple sets of sliding cavities (511) are provided in the hydraulic chamber (51). A sliding column (53) is slidably connected in the sliding cavity (511). A support block (54) is provided at one end of the sliding column (53).

2. The machine tool worktable clamping structure according to claim 1, characterized in that: The bonding unit (3) is provided in multiple sets. The worktable (2) is provided with a guide groove (21). The guide block (31) slides with the guide groove (21). The bottom of the worktable (2) is provided with a driving device (22) that can drive the guide block (31) to slide back and forth along the guide groove (21). The moving direction of the mounting support (32) and the corresponding guide block (31) is the same. The two ends of the first elastic element (36) are connected to the bonding block (35) and the mounting support (32) respectively. In this embodiment, the first elastic element (36) is set as a torsion spring.

3. The machine tool worktable clamping structure according to claim 2, characterized in that: The locking ball seat (33) is slidably disposed on the side away from the universal ball (34) inside the limiting cylinder (41), so that the side of the locking claw (331) near the mounting support (32) can be accommodated in the limiting cylinder (41). A through groove is provided on the side of the limiting cylinder (41), so that the connection position between the locking ball seat (33) and the mounting support (32) can pass through the through groove. The guide slope (332) on the locking claw (331) is close to each other at the end near the mounting support (32) and far away from the mounting support (32), forming a flared guide cone surface.

4. The machine tool worktable clamping structure according to claim 1, characterized in that: The two ends of the second elastic element (42) are respectively connected to the end of the locking ball seat (33) away from the universal ball (34) and the inside of the limiting cylinder (41). In this embodiment, the second elastic element (42) is set as a compression spring.

5. A machine tool worktable clamping structure according to claim 3, characterized in that: The top of the bonding block (35) is provided with an inlet pipe (52), which is connected to the hydraulic chamber (51). The sliding column (53) passes through the side of the bonding block (35) away from the universal ball (34) and extends to the outside of the bonding block (35). The support block (54) is provided outside the bonding block (35).

6. The machine tool worktable clamping structure according to claim 5, characterized in that: The bonding block (35) has two main clamping surfaces (351) arranged horizontally on both sides. The main clamping surfaces (351) are arranged on the same side as the support block (54), and the hydraulic chamber (51) is arranged between the two main clamping surfaces (351).

7. A machine tool worktable clamping structure according to claim 6, characterized in that: The bonding unit (3) is provided with a bidirectional flow unit (6), which includes air guide pipes (61) on both sides of the bonding block (35), and multiple air guide ports (62) on the main clamping surface (351). The air guide ports (62) are connected to the air guide pipes (61), and a flow detection device (63) is provided on the air guide pipes (61). An air pump is provided inside the machine tool (1).

8. The machine tool worktable clamping structure according to claim 1, characterized in that: The guide block (31) is provided with a sensor (7), and the mounting bracket (32) is provided with an indicator plate (71) that works in conjunction with the sensor (7). The sensor (7) is used to detect the relative position of the mounting bracket (32) and the guide block (31).

Images