Hydraulic prestressed compensation device for machine tool crossbeam

Abstract

The present invention provides a hydraulic prestressed compensation device for a machine tool crossbeam, which is provided with a crossbeam assembly, wherein the crossbeam assembly comprises an intermediate crossbeam, a right supporting square box and a left supporting square box, wherein the intermediate crossbeam comprises a horizontal rib plate, a right rib plate and a left rib plate, wherein an upper surface of the crossbeam is provided on the upper part of the crossbeam assembly, a hydraulic cylinder placement groove is provided on one side of the crossbeam assembly at the bottom of the intermediate crossbeam, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are provided inside the hydraulic cylinder placement groove, and a hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum; the present invention solves the problems of complex processing technology, inflexible adjustment and unreliability existing in the existing traditional method for overcoming crossbeam deformation and improving crossbeam rigidity, and the present invention can be widely used in hydraulic prestressed compensation of machine tool crossbeams, and is particularly suitable for hydraulic prestressed compensation of crossbeams of large machine tools.

Description

Technical Field

[0001] The invention relates to a crossbeam of a metal cutting machine tool, in particular to a hydraulic prestress compensation device for the crossbeam of the machine tool. Background Art

[0002] Large gantry frame machine tools are an important type of metal cutting processing equipment. Although this type of machine tool has different structural and processing capability requirements, the beam is an important component. The accuracy of the beam and beam-related components also affects the accuracy and performance of the entire machine tool.

[0003] At present, the beam arrangement of large gantry frame machine tools is generally divided into two-end supports, and the support forms are divided into fixed supports and mobile supports. However, no matter which support form is used, the beam will deform downward due to its own heavy weight, and the related moving parts on the beam, such as the slide, ram, spindle and transmission box, will also exert a downward force on the beam, thereby further increasing the downward deformation of the beam. Excessive deformation causes the relevant accuracy of the beam to decrease. When the moving parts move to different positions on the beam, the deformation of the beam also changes accordingly. Therefore, overcoming the deformation of the machine tool beam, improving the rigidity of the beam, and compensating for the deformation of loads at different positions are the main issues in improving the machining accuracy of large gantry frame machine tools.

[0004] We know that the existing main technical solutions for overcoming beam deformation, improving beam rigidity, and compensating for deformation caused by changing beam loads include using high-grade high-quality materials, using closed beam cross-section shapes, optimizing the position, size and shape of inner cavity reinforcements, using external skeleton support plate structures, using column built-in weight balance methods, and beam anti-deformation processing methods. However, all of the above methods have problems such as complex processing technology, inflexible adjustment, and unreliability. They are also unable to compensate for the strain of the beam in real time according to changes in the beam load caused by changes in the position of moving parts on the beam. Summary of the invention

[0005] The present invention aims to solve the technical problem that the traditional method of overcoming the deformation of the beam and improving the rigidity of the beam has the problems of complex processing technology, inflexible adjustment, unreliability, etc., and is also unable to perform strain compensation for the beam in real time according to the change of the beam load caused by the position change of the moving parts on the beam. The present invention provides a hydraulic prestressed compensation device and compensation method for the machine tool beam, which has simple processing technology, flexible adjustment, high reliability, and can perform strain compensation for the beam in real time according to the change of the beam load caused by the position change of the moving parts on the beam.

[0006] To this end, the technical solution of the present invention is a hydraulic prestressed compensating device for a machine tool crossbeam, which is provided with a crossbeam assembly, the crossbeam assembly includes a middle crossbeam, a right supporting square box and a left supporting square box, the middle crossbeam includes a horizontal rib plate, a right rib plate and a left rib plate, the upper part of the crossbeam assembly is provided with a crossbeam upper surface, one side of the crossbeam assembly is provided with a hydraulic cylinder placement groove at the bottom of the middle crossbeam, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are provided inside the hydraulic cylinder placement groove, and a hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum;

[0007] The hydraulic cylinder placement grooves provided at the bottom of the middle cross beam are arranged symmetrically with respect to the center line of the horizontal rib plate, and hydraulic cylinders are respectively provided inside the two symmetrically arranged hydraulic cylinder placement grooves, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are respectively located inside the hydraulic cylinder placement grooves on one side, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are symmetrically arranged with respect to the center line of the horizontal rib plate;

[0008] A hydraulic cylinder placement groove is symmetrically arranged at the bottom of the middle cross beam on the other side of the cross beam assembly relative to the central plane of the cross beam assembly, a reinforcing span plate is arranged in the middle of the cross beam assembly, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are arranged inside the hydraulic cylinder placement groove arranged at the bottom of the middle cross beam on the other side of the cross beam assembly, and a hydraulic cylinder is rotatably arranged between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum;

[0009] The hydraulic cylinder placement grooves symmetrically arranged at the bottom of the middle cross beam on the other side of the cross beam assembly relative to the central plane of the cross beam assembly are symmetrically arranged relative to the center line of the horizontal rib plate. Hydraulic cylinders are respectively arranged inside the two symmetrically arranged hydraulic cylinder placement grooves. The hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are respectively located inside the hydraulic cylinder placement grooves on one side. The hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are symmetrically arranged relative to the center line of the horizontal rib plate.

[0010] A hydraulic prestressed compensating device for a machine tool crossbeam is provided with a crossbeam assembly, the crossbeam assembly includes a middle crossbeam, a right supporting square box and a left supporting square box, the middle crossbeam includes a horizontal rib plate, a right rib plate and a left rib plate, the upper part of the crossbeam assembly is provided with a crossbeam upper surface, one side of the crossbeam assembly is provided with a hydraulic cylinder placement groove at the bottom of the middle crossbeam, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are provided inside the hydraulic cylinder placement groove, and a hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum;

[0011] A hydraulic cylinder placement groove is symmetrically arranged at the bottom of the middle cross beam on the other side of the cross beam assembly relative to the central plane of the cross beam assembly, a reinforcing span plate is arranged in the middle of the cross beam assembly, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are arranged inside the hydraulic cylinder placement groove arranged at the bottom of the middle cross beam on the other side of the cross beam assembly, and a hydraulic cylinder is rotatably arranged between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum;

[0012] The stress compensation fulcrum of the hydraulic cylinder is located at one end of the outer side of the center line of the horizontal rib and away from the supporting point of the hydraulic cylinder.

[0013] Preferably, square holes for reinforcing rigidity are respectively provided on both sides of the crossbeam assembly.

[0014] Preferably, the middle cross beam is a hollow structure.

[0015] The beneficial effect of the present invention is that a hydraulic prestressed compensation device for a machine tool crossbeam is provided with a crossbeam assembly, the crossbeam assembly includes a middle crossbeam, a right supporting square box and a left supporting square box, the middle crossbeam includes horizontal ribs, right ribs and left ribs, a crossbeam upper surface is provided on the upper part of the crossbeam assembly, a hydraulic cylinder placement groove is provided on one side of the crossbeam assembly at the bottom of the middle crossbeam, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are provided inside the hydraulic cylinder placement groove, a hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum, the crossbeam assembly will deform due to its own gravity during operation, and at this time it can be corrected by the supporting force of the hydraulic cylinder, and the action point of the supporting force of the hydraulic cylinder acts on the stress compensation fulcrum of the hydraulic cylinder to complete the support of the deformation.

[0016] Because the other side of the beam assembly is located at the bottom of the middle cross beam and a hydraulic cylinder placement groove is symmetrically provided with respect to the central plane of the beam assembly, a reinforcing span plate is provided in the middle position of the beam assembly, and the other side of the beam assembly is located at the bottom of the middle cross beam and a hydraulic cylinder placement groove is provided inside which a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are provided, and a hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum. This structure realizes the symmetrical setting of the beam assembly in the thickness direction, which is more uniform and has a good effect when correction is performed through the supporting force of the hydraulic cylinder.

[0017] Since the stress compensation fulcrum of the hydraulic cylinder is located at the end outside the center line of the horizontal rib and away from the support point of the hydraulic cylinder, the position of the hydraulic cylinder support point is set in this way, which can effectively achieve balanced force distribution and ensure reasonable correction deformation of the upper surface of the beam, which can ensure the correction deformation of the center line of the horizontal rib on the left side, the deformation of the center line of the horizontal rib on the right side, and uniform deformation. The setting position of the above force points is a reasonable position set after finite element analysis and has been verified by strain testing.

[0018] Since the stiffness-reinforced square holes are respectively provided on both sides of the beam assembly, the stiffness of both sides of the beam assembly is ensured by the stiffness-reinforced square holes. At the same time, the middle cross beam in this embodiment is a hollow structure, which is combined with the stiffness-reinforced square holes on both sides of the beam assembly, thereby ensuring the overall stiffness of the beam assembly.

[0019] Since the hydraulic cylinder placement grooves provided at the bottom of the middle cross beam are symmetrically arranged relative to the center line of the horizontal rib plate, hydraulic cylinders are respectively provided inside the two symmetrically arranged hydraulic cylinder placement grooves, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are respectively located inside the hydraulic cylinder placement grooves on one side, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are symmetrically arranged relative to the center line of the horizontal rib plate, such a mechanism, because the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are respectively located inside the hydraulic cylinder placement grooves on one side, symmetrical stress compensation of the hydraulic cylinder stress compensation fulcrums is formed on both sides of the center line of the horizontal rib plate, and the compensation effect is better.

[0020] Because the other side of the beam assembly is located at the bottom of the middle cross beam and is symmetrically provided with a hydraulic cylinder placement groove relative to the center plane of the beam assembly, the hydraulic cylinder placement groove located at the bottom of the middle cross beam is symmetrically arranged relative to the center line of the horizontal rib, and hydraulic cylinders are respectively arranged inside the two symmetrically arranged hydraulic cylinder placement grooves, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are respectively located inside the hydraulic cylinder placement groove on one side, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are symmetrically arranged relative to the center line of the horizontal rib, and independent hydraulic cylinder stress compensation fulcrum support units are formed on both sides of the center plane of the beam assembly and on both sides of the center line of the horizontal rib, which is very suitable for automatic correction of the beam assembly of large machine tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a three-dimensional structure with a hydraulic cylinder correction according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of a three-dimensional structure from another angle;

[0023] Figure 3 yes Figure 1 Bottom view of

[0024] Figure 4 Figure 1 The main view of

[0025] Figure 5 It is a schematic diagram of a three-dimensional structure with two hydraulic cylinders for correction according to an embodiment of the present invention;

[0026] Figure 6 yes Figure 5A schematic diagram of a three-dimensional structure from another angle;

[0027] Figure 7 yes Figure 5 Bottom view of

[0028] Figure 8 yes Figure 5 The main view of

[0029] Fig. 9 It is a schematic diagram of a three-dimensional structure with two hydraulic cylinders for correction located on both sides of an embodiment of the present invention;

[0030] Fig.10 It is a schematic diagram of a three-dimensional structure with four hydraulic cylinders for correction on both sides according to an embodiment of the present invention.

[0031] Explanation of symbols in the figure:

[0032] 1. Crossbeam assembly; 2. Hydraulic cylinder; 3. Hydraulic cylinder support point; 4. Hydraulic cylinder stress compensation fulcrum; 5. Hydraulic cylinder placement groove; 6. Rigidity reinforcement square hole; 7. Crossbeam support bottom surface; 8. Crossbeam upper surface; 9. Horizontal rib plate; 10. Right rib plate; 11. Left rib plate; 12. Middle cross beam; 13. Right support square box; 14. Left support square box; 15. Strengthening cross plate; 16. Center line of horizontal rib plate; 17. Center plane of crossbeam assembly. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with embodiments.

[0034] Figure 1-Figure 10 The invention discloses a hydraulic prestressed compensating device for a machine tool crossbeam. As can be seen from the figure, it is provided with a crossbeam assembly 1, which includes a middle crossbeam 12, a right supporting square box 13 and a left supporting square box 14. The middle crossbeam 12 includes horizontal ribs 9, right ribs 10 and left ribs 11. A crossbeam upper surface 8 is provided on the upper part of the crossbeam assembly 1. A hydraulic cylinder placement groove 5 is provided on one side of the crossbeam assembly 1 at the bottom of the middle crossbeam 12. A hydraulic cylinder support point 3 and a hydraulic cylinder stress compensation fulcrum 4 are provided inside the hydraulic cylinder placement groove 5. A hydraulic cylinder 2 is rotatably provided between the hydraulic cylinder support point 3 and the hydraulic cylinder stress compensation fulcrum 4. The crossbeam assembly 1 will deform due to its own gravity during operation. At this time, it can be corrected by the supporting force of the hydraulic cylinder 2. The point of action of the supporting force of the hydraulic cylinder 2 acts on the hydraulic cylinder stress compensation fulcrum 4, which can complete the support of the deformation.

[0035] Figure 1 and Figure 4It can be clearly seen that the hydraulic cylinder stress compensation fulcrum 4 is located at the end of the hydraulic cylinder support point 3 outside the center line 16 of the horizontal rib 9. Since the hydraulic cylinder stress compensation fulcrum 4 is located at the end of the hydraulic cylinder support point 3 outside the center line 16 of the horizontal rib 9, the position of the hydraulic cylinder support point 3 is set in this way, which can effectively achieve balanced force distribution and ensure reasonable correction deformation of the upper surface 8 of the beam, which can ensure the correction deformation of the center line 16 of the horizontal rib 9 on the left side, the deformation of the center line 16 of the horizontal rib 9 on the right side, and uniform deformation. The setting position of the above force points is a reasonable position set after finite element analysis and has been verified by strain testing.

[0036] Figure 1 It can be seen that the two sides of the beam assembly 1 are respectively provided with stiffness-reinforced square holes 6, and the middle cross beam 12 is a hollow structure. Since the two sides of the beam assembly 1 are respectively provided with stiffness-reinforced square holes 6, the stiffness-reinforced square holes 6 ensure the stiffness of the two sides of the beam assembly 1. At the same time, the middle cross beam 12 in this embodiment is a hollow structure, which is combined with the stiffness-reinforced square holes 6 on both sides of the beam assembly 1, thereby also ensuring the overall stiffness of the beam assembly 1.

[0037] like Figure 8 As shown, the hydraulic cylinder placement groove 5 provided at the bottom of the middle cross beam 12 is symmetrically arranged relative to the center line 16 of the horizontal rib plate 9, and the two symmetrically arranged hydraulic cylinder placement grooves 5 are respectively provided with hydraulic cylinders 2, and the hydraulic cylinder stress compensation fulcrums 4 of the two symmetrically arranged hydraulic cylinders 2 are respectively located inside the hydraulic cylinder placement groove 5 on one side, and the hydraulic cylinder stress compensation fulcrums 4 of the two symmetrically arranged hydraulic cylinders 2 are symmetrically arranged relative to the center line 16 of the horizontal rib plate 9; because the hydraulic cylinder placement groove 5 provided at the bottom of the middle cross beam 12 is symmetrically arranged relative to the center line 16 of the horizontal rib plate 9, the symmetrically arranged A hydraulic cylinder 2 is respectively provided inside the two hydraulic cylinder placement grooves 5, and the hydraulic cylinder stress compensation fulcrums 4 of the two symmetrically arranged hydraulic cylinders 2 are respectively located inside the hydraulic cylinder placement grooves 5 on one side, and the hydraulic cylinder stress compensation fulcrums 4 of the two symmetrically arranged hydraulic cylinders 2 are symmetrically arranged relative to the center line 16 of the horizontal rib 9. In such a mechanism, because the hydraulic cylinder stress compensation fulcrums 4 of the two symmetrically arranged hydraulic cylinders 2 are respectively located inside the hydraulic cylinder placement grooves 5 on one side, symmetrical stress compensation of the hydraulic cylinder stress compensation fulcrums 4 is formed on both sides of the center line 16 of the horizontal rib 9, and the compensation effect is better.

[0038] Fig. 9 is a schematic diagram of a three-dimensional structure with two hydraulic cylinders for correction on both sides according to an embodiment of the present invention. Fig. 9It can be seen that the other side of the cross beam assembly 1 is located at the bottom of the middle cross beam 12 and is symmetrically provided with a hydraulic cylinder placement groove 5 relative to the central plane 17 of the cross beam assembly 1, a reinforcing span plate 15 is provided in the middle position of the cross beam assembly 1, and the other side of the cross beam assembly 1 is located at the bottom of the middle cross beam 12. The hydraulic cylinder placement groove 5 is provided with a hydraulic cylinder support point 3 and a hydraulic cylinder stress compensation fulcrum 4, and a hydraulic cylinder 2 is rotatably provided between the hydraulic cylinder support point 3 and the hydraulic cylinder stress compensation fulcrum 4. Because the other side of the cross beam assembly 1 is located at the bottom of the middle cross beam 12 and is symmetrically provided with a hydraulic cylinder placement groove 5 relative to the central plane 17 of the cross beam assembly 1, a reinforcing span plate 15 is provided in the middle position of the cross beam assembly 1, and the other side of the cross beam assembly 1 is located at the bottom of the middle cross beam 12. The hydraulic cylinder placement groove 5 is provided with a hydraulic cylinder support point 3 and a hydraulic cylinder stress compensation fulcrum 4, and a hydraulic cylinder 2 is rotatably provided between the hydraulic cylinder support point 3 and the hydraulic cylinder stress compensation fulcrum 4, this structure realizes the symmetrical setting of the thickness direction of the cross beam assembly 1, and is more uniform when corrected by the supporting force of the hydraulic cylinder 2, and the effect is very good.

[0039] Fig.10 Schematic diagram of a three-dimensional structure with four hydraulic cylinders for correction on both sides of an embodiment of the present invention, as shown in FIG. Fig.10 On the other side of the shown crossbeam assembly 1, a hydraulic cylinder placement groove 5 is symmetrically provided at the bottom of the middle crossbeam 12 relative to the center plane 17 of the crossbeam assembly 1. The hydraulic cylinder placement groove 5 provided at the bottom of the middle crossbeam 12 is symmetrically arranged relative to the center line 16 of the horizontal rib 9. A hydraulic cylinder 2 is respectively provided inside the two symmetrically arranged hydraulic cylinder placement grooves 5. The hydraulic cylinder stress compensation fulcrums 4 of the two symmetrically arranged hydraulic cylinders 2 are respectively located inside the hydraulic cylinder placement grooves 5 on one side. The hydraulic cylinder stress compensation fulcrums 4 of the two symmetrically arranged hydraulic cylinders 2 are symmetrically arranged relative to the center line 16 of the horizontal rib 9. Four independent support units of the hydraulic cylinder stress compensation fulcrums 4 are respectively formed on both sides of the center plane 17 of the crossbeam assembly 1 and on both sides of the center line 16 of the horizontal rib 9, which is very suitable for automatic correction of the crossbeam assembly 1 of a large machine tool.

[0040] like Figure 5 As shown, the design dimensions of this embodiment are: the length of the beam assembly 1 is 6 meters, the width is 1.5 meters, the thickness of the beam assembly 1 is 2 meters, the size of the horizontal rib 9 is 500 mm, the size of the right supporting square box 13 and the left supporting square box 14 are both 1 meter. A three-dimensional model of the beam assembly 1 is established for the above structure, and a finite element analysis is performed to obtain the stress distribution of the beam assembly 1. According to the above analysis, the size of the compensation force to be completed can be obtained, and accurate stress compensation can be achieved, thereby achieving the purpose of calibrating the stress deformation of the beam.

[0041] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A hydraulic prestressed compensating device for a machine tool crossbeam, provided with a crossbeam assembly, characterized in that: The crossbeam assembly comprises a middle crossbeam, a right supporting square box and a left supporting square box, the middle crossbeam comprises a horizontal rib plate, a right rib plate and a left rib plate, the upper part of the crossbeam assembly is provided with a crossbeam upper surface, one side of the crossbeam assembly is provided with a hydraulic cylinder placement groove at the bottom of the middle crossbeam, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are provided inside the hydraulic cylinder placement groove, and a hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum; The hydraulic cylinder placement grooves provided at the bottom of the middle cross beam are arranged symmetrically with respect to the center line of the horizontal rib plate, and hydraulic cylinders are respectively provided inside the two symmetrically arranged hydraulic cylinder placement grooves, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are respectively located inside the hydraulic cylinder placement grooves on one side, and the hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are symmetrically arranged with respect to the center line of the horizontal rib plate; The other side of the cross beam assembly is located at the bottom of the middle cross beam and is symmetrically provided with a hydraulic cylinder placement groove relative to the central plane of the cross beam assembly. A reinforcing span plate is provided in the middle of the cross beam assembly. The other side of the cross beam assembly is located at the bottom of the middle cross beam and is provided with a hydraulic cylinder placement groove with a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum inside. A hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum. The other side of the crossbeam assembly is located at the bottom of the middle crossbeam, and a hydraulic cylinder placement groove is symmetrically arranged relative to the central plane of the crossbeam assembly. It is symmetrically arranged relative to the center line of the horizontal rib plate. A hydraulic cylinder is respectively arranged inside the two symmetrically arranged hydraulic cylinder placement grooves. The hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are respectively located inside the hydraulic cylinder placement groove on one side. The hydraulic cylinder stress compensation fulcrums of the two symmetrically arranged hydraulic cylinders are symmetrically arranged relative to the center line of the horizontal rib plate.

2. The hydraulic prestressing compensation device for a machine tool crossbeam according to claim 1, characterized in that: Rigidity-enhancing square holes are respectively arranged on both sides of the crossbeam assembly.

3. The hydraulic prestressing compensation device for a machine tool crossbeam according to claim 1 is characterized in that: The middle cross beam is a hollow structure.

4. A hydraulic prestressed compensating device for a machine tool crossbeam, provided with a crossbeam assembly, characterized in that: The crossbeam assembly comprises a middle crossbeam, a right supporting square box and a left supporting square box, the middle crossbeam comprises a horizontal rib plate, a right rib plate and a left rib plate, the upper part of the crossbeam assembly is provided with a crossbeam upper surface, one side of the crossbeam assembly is provided with a hydraulic cylinder placement groove at the bottom of the middle crossbeam, a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum are provided inside the hydraulic cylinder placement groove, and a hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum; The other side of the cross beam assembly is located at the bottom of the middle cross beam and is symmetrically provided with a hydraulic cylinder placement groove relative to the central plane of the cross beam assembly. A reinforcing span plate is provided in the middle of the cross beam assembly. The other side of the cross beam assembly is located at the bottom of the middle cross beam and is provided with a hydraulic cylinder placement groove with a hydraulic cylinder support point and a hydraulic cylinder stress compensation fulcrum inside. A hydraulic cylinder is rotatably provided between the hydraulic cylinder support point and the hydraulic cylinder stress compensation fulcrum. The hydraulic cylinder stress compensation fulcrum is located outside the center line of the horizontal rib and away from the hydraulic cylinder support point; Rigidity-enhancing square holes are respectively arranged on both sides of the crossbeam assembly.

5. The hydraulic prestressing compensation device for a machine tool crossbeam according to claim 4, characterized in that: The middle cross beam is a hollow structure.

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