Vertical machine tool for machining sheet metal parts

Abstract

The vertical machine tool comprises a machine tool body, the machine tool body is provided with a main shaft capable of moving in the X-axis direction, the Y-axis direction and the Z-axis direction, the machine tool body is further provided with two cradle supports, a cradle rotary table rotating around the X-axis is arranged between the two cradle supports, one cradle support is provided with a driving box, and the other cradle support is provided with a driving motor. A cradle driving motor and a transmission structure are arranged in the driving box, a transmission gear fixed to the cradle rotary table is arranged in the cradle support, and a locking assembly is arranged on the cradle support provided with the driving box, so that the cradle rotary table is effectively locked at a certain specific angle. A brake assembly is arranged on the other cradle support, so that the cradle rotary table is limited to keep still at any angle; the influence on a cradle driving motor and a transmission structure is reduced, the long-time stable operation of the machine tool is ensured, and the reliability and the safety of the machine tool are further improved.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing, in particular to a vertical machine tool used for processing sheet metal parts. Background Art

[0002] Sheet metal processing is an indispensable part of modern manufacturing, especially in the fields of automobiles, aviation, electronics, etc. High-precision sheet metal processing is crucial to improving product quality and production efficiency. Existing vertical machine tools are widely used in the processing of various sheet metal parts due to their compact structure, flexible operation, and high processing accuracy. However, with the increasing market demand for complex shapes and multi-angle processing, traditional three-axis vertical machine tools can no longer meet the growing demand. Therefore, multi-axis machine tools with more degrees of freedom have emerged.

[0003] In multi-axis machine tools, a common solution is to achieve more complex machining actions by adding additional rotating axes. For example, some machine tools achieve four-axis linkage by adding a rotating table to the bed so that it can rotate in the X-axis direction. In addition, some machine tools further enhance the flexibility and adaptability of the machine tools by installing a rotatable cradle turntable on the worktable. These methods usually rely on motors and transmission structures to achieve precise control and stable operation of the cradle turntable.

[0004] Although the above solutions have improved the versatility and machining accuracy of machine tools to a certain extent, there are still some shortcomings in practical applications. Especially when the workpiece needs to be cut at a certain angle for a long time, the stability of the cradle turntable becomes a key issue. The traditional method mainly relies on the motor and transmission structure to maintain the fixed position of the cradle turntable, but due to the wear and fatigue of the motor and transmission structure under long-term high-load operation, the positioning accuracy of the cradle turntable may decrease, thereby affecting the machining quality and the service life of the machine tool. In addition, the continuous load of the motor and transmission structure will increase energy consumption and reduce work efficiency. Therefore, how to effectively reduce the burden on the motor and transmission structure while ensuring machining accuracy has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the problem that the cradle turntable remains at a certain angle for a long time during the processing, causing the transmission mechanism and the motor to be subjected to stress for a long time and affecting the processing accuracy of the machine tool.

[0006] The present invention adopts the following technical scheme: a vertical machine tool for sheet metal processing, comprising a bed, the bed is provided with a spindle that can move along the X-axis, Y-axis and Z-axis directions, two cradle supports are also provided on the bed, a cradle turntable that rotates around the X-axis is provided between the two cradle supports, one of the cradle supports is provided with a drive box, a cradle drive motor and a transmission structure are provided in the drive box, a transmission gear fixed to the cradle turntable is provided in the cradle support, a locking assembly is provided on the cradle support provided with the drive box, the locking assembly includes a lock hole provided on the end face of the transmission gear, a locking cover body fixed on the cradle support and a slidable lock provided on the lock A locking rod is provided on the cover body, wherein the movement direction of the locking rod is parallel to the X-axis direction, the locking rod matches the shape of the locking hole, and a driving element for driving the locking rod to insert into the locking hole is provided on the cradle support; a braking assembly is provided on the other cradle support, and the braking assembly comprises a braking disc fixed to the cradle turntable, a braking seat fixed to the cradle support, and a friction disc mounted on the braking seat, a plurality of guide rods evenly arranged in a circumference are fixed to the side of the friction disc facing away from the braking disc, the guide rod is penetrated through the braking seat and the guide rod and the braking seat are slidably matched, and the sliding direction of the guide rod is parallel to the X-axis direction, and a driving assembly for driving the friction disc to press against the braking disc is provided on the cradle support.

[0007] The present application is further configured as follows: the wall of the lock hole has a taper, the inner diameter of the end of the lock hole facing the lock rod is larger, the inner diameter of the end of the lock hole away from the lock rod is smaller, and the taper of the lock rod is consistent with the taper of the lock hole.

[0008] The present application is further configured as follows: a gear cavity is fixedly formed between the locking cover and the corresponding cradle support, and the transmission gear is located in the gear cavity.

[0009] The present application is further configured as follows: the driving element is a cylinder, an end cover is provided on the cradle support, the cylinder is fixed to the end cover, the telescopic rod of the cylinder passes through the end cover, a pressure cover is fixed on the end of the telescopic rod, and the pressure cover is fixed to a plurality of locking rods.

[0010] The present application is further configured as follows: the driving element is a hand wheel, an end cover is provided on the cradle support, the hand wheel is fixedly connected with a screw rod, the screw rod is threadedly connected to the end cover, the screw rod is rotationally connected to the pressure cover and can drive the pressure cover to move axially with the screw rod.

[0011] The present application is further configured as follows: a piston rod is also provided on the side of the friction disc facing away from the brake disc, and the piston rod is fixed to the center of the friction disc; the piston rod passes through the brake seat, and a hydraulic housing with an opening is provided at a position of the brake seat corresponding to the piston rod, and the opening shape of the hydraulic housing matches the piston rod. A hydraulic cavity is formed after the hydraulic housing is fixed to the brake seat, and the piston rod passing through the brake seat enters the hydraulic cavity. A nozzle is provided on the hydraulic housing, and the nozzle is connected to the hydraulic system.

[0012] The present application is further configured as follows: the hydraulic system comprises a bidirectional pump, and the bidirectional pump is connected to a nozzle for delivering hydraulic oil into the hydraulic cavity or extracting the hydraulic oil from the hydraulic cavity.

[0013] The present application is further configured as follows: a portion of the guide rod passing through the brake seat is sleeved with a spring, and a nut is fixed to the end of the guide rod, one end of the spring abuts against the nut, and the other end of the spring abuts against the outer wall of the brake seat, and the spring gives elastic force to the friction disc away from the brake disc.

[0014] In summary, this application has at least the following beneficial effects: 1. When the workpiece to be processed does not need to rotate the cradle turntable, the cradle turntable can be locked through the locking assembly, so that the machine tool can be used as a three-axis machine tool. The cutting force generated during the cutting process of the machine tool does not affect the transmission structure and the cradle motor.

[0015] 2. The cradle drive motor drives the cradle turntable to a specific angle and keeps the cradle turntable stationary through the locking assembly. At this time, the weight of the cradle turntable, the workpiece and the force during the cutting process can be borne by the locking assembly, reducing the impact on the cradle drive motor and the transmission structure, and increasing the stability of the cradle when it is stationary.

[0016] 3. The brake assembly supplements the function of the locking assembly. The cradle drive motor drives the cradle turntable to any angle, and the friction between the friction disc and the brake disc keeps the cradle turntable stationary. During the CNC machining process, when the cradle turntable needs to be stationary for a short time, the brake assembly can be used to maintain the angle of the cradle turntable, reducing the impact on the transmission structure of the cradle turntable and the cradle drive motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of Embodiment 1 of the present application; Figure 2 It is a structural schematic diagram of the locking assembly and the braking assembly in the first embodiment of the present application; Figure 3 It is a structural schematic diagram of the locking assembly in the second embodiment of the present application.

[0018] Description of reference numerals: 1. Bed; 11. X-axis guide; 12. X-axis drive motor; 2. X-axis moving seat; 21. Y-axis guide; 22. Y-axis drive motor; 3. Y-axis moving seat; 31. Z-axis guide; 32. Z-axis drive motor; 4. Z-axis moving seat; 41. Spindle; 5. Cradle support; 51. Cradle turntable; 511. Mounting table; 52. Turntable; 53. Transmission gear; 6. Drive box; 7. Locking assembly; 71. Locking hole; 72. Locking cover; 73. Locking rod; 74. Pressure cover; 75. End cover; 76. Cylinder; 77. Handwheel; 78. Screw; 8. Brake assembly; 81. Brake disc; 82. Friction disc; 821. Friction plate; 822. Guide rod; 823. Nut; 824. Spring; 825. Piston rod; 83. Brake seat; 84. Hydraulic housing; 841. Connector. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 An embodiment of the present application provides a vertical machine tool for sheet metal processing, including a bed 1, a Y-axis guide rail 21, a Y-axis movable seat 3, a Y-axis drive motor 22, an X-axis guide rail 11, an X-axis movable seat 2, an X-axis drive motor 12, a Z-axis guide rail 31, a Z-axis movable seat 4, a Z-axis drive motor 32, a spindle 41, a cradle support 5, a cradle turntable 51, a drive box 6, a cradle drive motor, a transmission structure, a transmission gear 53, a locking assembly 7 and a brake assembly 8. The bed 1 is provided with two Y-axis guide rails 21 arranged along the Y-axis direction, and a Y-axis moving seat 3 is provided on the Y-axis guide rails 21, and the Y-axis guide rails 21 and the Y-axis moving seat 3 are slidably matched, and the bed 1 is provided with a Y-axis driving motor 22 for driving the Y-axis moving seat 3 to move along the direction of the Y-axis guide rails 21; the Y-axis moving seat 3 is provided with two X-axis guide rails 11, and the two X-axis guide rails 11 are arranged on the vertical surface of the Y-axis moving seat 3, and the X-axis guide rails 11 are provided with an X-axis moving seat 2, and the X-axis moving seat 2 and the X-axis guide rails 11 are slidably matched, and the Y-axis moving seat 3 is provided with a driving motor 22 for driving the X-axis moving seat 2 along the direction of the Y-axis guide rails 21. An X-axis driving motor 12 moves the X-axis guide 11; the X-axis moving seat 2 is provided with a Z-axis guide 31 arranged along the Z-axis direction, a Z-axis moving seat 4 is arranged on the Z-axis guide 31, the Z-axis moving seat 4 and the Z-axis guide 31 are slidably matched, and a Z-axis driving motor 32 is arranged on the X-axis guide 11 to drive the Z-axis moving seat 4 to move along the Z-axis guide 31; the Z-axis moving seat 4 is provided with a spindle 41, and the spindle 41 is used to install a tool, and the tool is controlled to move in the X, Y, and Z axis directions through the coordinated action of the X-axis driving motor 12, the Y-axis driving motor 22, and the Z-axis driving motor 32.

[0021] Two cradle supports 5 are fixed on the bed 1, and a cradle turntable 51 is installed between the two cradle supports 5. A mounting platform 511 is provided on the cradle turntable 51, and the mounting platform 511 is used to fix the fixture. The two ends of the cradle turntable 51 are rotatably mounted on the cradle supports 5, so that the cradle turntable 51 can rotate around the X-axis; specifically, a turntable 52 is installed on the opposite surfaces of the two cradle supports 5, and the turntable 52 is rotatably connected to the cradle supports 5, and the rotation axis of the turntable 52 is parallel to the X-axis, and the cradle turntable 51 and the turntable 52 are fixed by multiple bolts. A driving box 6 is provided on one of the cradle supports 5, and a cradle driving motor and a transmission structure are installed in the driving box 6. A transmission gear 53 is fixedly installed on the side of the cradle turntable 52 facing away from the cradle turntable 51. The transmission gear 53 is connected to the cradle driving motor through the transmission structure. Therefore, the cradle turntable 51 can be driven to rotate around the X-axis under the drive of the cradle driving motor, so that the machine tool can realize four-axis linkage.

[0022] The cradle support 5 provided with a driving box 6 is provided with a locking assembly 7, which includes a locking hole 71 provided on the end surface of the transmission gear 53, a locking cover 72 fixed to the cradle support 5, and a locking rod 73 slidably provided on the locking cover 72, the movement direction of the locking rod 73 is parallel to the X-axis direction, the locking rod 73 matches the shape of the locking hole 71, and the cradle support 5 is provided with a driving element for driving the locking rod 73 to insert into the locking hole 71; another cradle support 5 is provided with a brake assembly 8, which The dynamic component 8 includes a brake disc 81 fixed to the cradle turntable 51, a brake seat 83 fixed to the cradle support 5, and a friction disc 82 installed on the brake seat 83. A plurality of guide rods 822 evenly arranged in a circumference are fixed to the side of the friction disc 82 facing away from the brake disc 81. The guide rods 822 penetrate the brake seat 83 and slide with the brake seat 83. The sliding direction of the guide rods 822 is parallel to the X-axis direction. A driving component for driving the friction disc 82 to press against the brake disc 81 is provided on the cradle support 5.

[0023] Specifically, the locking assembly 7 includes a locking hole 71, a locking cover 72 and a locking rod 73. The locking hole 71 is arranged on the end face of the transmission gear 53. There are multiple locking holes 71, and the multiple locking holes 71 are evenly arranged around the axial direction of the transmission gear 53. As a preferred embodiment, the locking hole 71 is a through hole. The number of locking holes 71 is determined according to the angle that needs to be locked in the actual production process. For example, in the process of workpiece processing, there are many processing conditions that require the cradle to rotate ±90° for a long time for cutting, then 4 locking holes 71 can be set, and if it is required to rotate ±60° for a long time for long-term cutting, 6 locking holes 71 can be set, and so on. The number of locking rods 73 is consistent with the number of locking holes 71. Since the locking cover 72 is fixed to the cradle support 5, and the locking rod 73 slides along the X-axis direction, when the locking rod 73 is inserted into the locking hole 71, the angle of the transmission gear 53 will be locked, thereby realizing the locking of the angle of the cradle turntable 51. The size of the locking rod 73 is consistent with the size of the locking hole 71. When the locking rod 73 slides on the locking cover 72 and is inserted into the locking hole 71, the locking hole 71 and the locking rod 73 can be tightly plugged, thereby limiting the rotation of the transmission gear 53 and making the cradle turntable 51 stay at a certain angle. At this time, the weight of the cradle turntable 51 and the workpiece and the force during the cutting process can be supported by the locking rod 73 and the locking hole 71, which has little impact on the transmission structure in the drive box 6 and the cradle drive motor, thereby ensuring that the machine tool can maintain the processing accuracy for a long time. The hole wall of the locking hole 71 can have a taper, and the inner diameter of the end of the locking hole 71 facing the locking rod 73 is larger, while the inner diameter of the end of the locking hole 71 away from the locking rod 73 is smaller. In coordination with this, the taper of the locking rod 73 is consistent with the taper of the locking hole 71, so that when the locking assembly 7 is locked, the taper of the locking hole 71 and the locking rod 73 can make the locking rod 73 better inserted into the locking hole 71.

[0024] Corresponding sealing members are used at the position where the locking cover 72 is combined with the cradle support 5, so that the locking cover 72 and the corresponding cradle support 5 are fixed to form a relatively closed gear cavity, and the connection between the locking cover 72 and the locking rod 73 has little effect on the sealing performance. Therefore, it can be considered that the transmission gear 53 is enclosed in the gear cavity. When lubricating oil is injected into the gear cavity, the lubrication of the transmission gear 53 can be maintained and the transmission gear 53 can be protected. At the same time, the lubricating oil in the gear cavity will also enter the locking hole 71, so that the locking hole 71 and the locking rod 73 can be fully lubricated, thereby reducing sticking and wear during the locking process. The locking cover 72 is also provided with a driving element for driving the locking rod 73 to slide. In this embodiment, the driving element is a cylinder 76. An end cover 75 is provided on the cradle support 5. The cylinder 76 is fixed to the end cover 75. The telescopic rod of the cylinder 76 passes through the end cover 75. A pressure cap 74 is fixed to the end of the telescopic rod. The pressure cap 74 is annular and fixed to multiple locking rods 73. The telescopic rod of the cylinder 76 is extended and retracted to drive the pressure cap 74 to move, and the pressure cap 74 synchronously drives multiple circumferentially arranged locking rods 73 to slide on the locking cover 72, so that the locking rod 73 is inserted into or pulled out of the lock hole 71 of the transmission gear 53.

[0025] When the workpiece to be processed does not need to rotate the cradle turntable 51, the cradle turntable 51 can be locked by the locking assembly 7, for example, the mounting table 511 is kept in a horizontal state, and the machine tool is used as a three-axis machine tool. Alternatively, the cradle drive motor drives the cradle turntable 51 to a specific angle, and the cradle turntable 51 is kept stationary by the locking assembly 7. At this time, the weight of the cradle turntable 51 and the workpiece and the force during the cutting process can be borne by the locking assembly 7, reducing the impact on the cradle drive motor and the transmission structure. During the actual operation of the machine tool, when the cradle turntable 51 stays at a certain angle for a set time in the CNC program, the CNC system can also control the telescopic rod of the cylinder 76 to extend and control the locking rod 73 to insert into the locking hole 71 to complete the locking of the cradle turntable 51. When the corresponding program is about to be executed, the CNC system controls the telescopic rod of the cylinder 76 to retract, so that the locking rod 73 is pulled out of the locking hole 71, the cradle turntable 51 is unlocked, and the cradle drive motor drives the cradle turntable 51 to rotate normally to achieve collaborative processing.

[0026] The brake assembly 8 is a supplement to the locking assembly 7. The brake assembly 8 can make the cradle turntable 52 stationary after the cradle turntable 51 rotates to any angle. The brake assembly 8 includes a brake disc 81 fixed to the turntable 52, a brake seat 83 fixed to the cradle support 5, and a friction disc 82 installed on the brake seat 83; the end surface of the friction disc 82 facing the brake disc 81 is provided with an annular friction plate 821, and the friction plate 821 is made of a material with a good friction coefficient. A plurality of guide rods 822 arranged evenly in a circumference are fixed to the side of the friction disc 82 facing away from the brake disc 81. The guide rods 822 penetrate the brake seat 83 and the guide rods 822 and the brake seat 83 are slidably matched. The sliding direction of the guide rods 822 is along the X-axis direction, so that the friction disc 82 can approach or move away from the brake disc 81. Due to the presence of multiple guide rods 822, the guide rods 822 can effectively limit the circumferential rotation of the friction disc 82. The side of the friction disc 82 facing away from the brake disc 81 is also provided with a piston rod 825, which is fixed at the center of the friction disc 82; the piston rod 825 penetrates the brake seat 83, and a hydraulic housing 84 with an opening is provided at the position of the brake seat 83 corresponding to the piston rod 825, and the opening shape of the hydraulic housing 84 matches the piston rod 825. After the hydraulic housing 84 and the brake seat 83 are fixed, a hydraulic cavity is formed, and the piston rod 825 penetrating the brake seat 83 can enter the hydraulic cavity. A nozzle is provided on the hydraulic housing 84 for oil inlet and outlet. In this application, the nozzle can be connected to a two-way pump for oil delivery or oil extraction into the hydraulic cavity, so as to control the friction disc 82 to be in close contact with the brake disc 81 to keep the cradle turntable 52 stationary or control the friction disc 82 to be away from the brake disc 81 to release the restriction on the cradle turntable 51.

[0027] In order to further facilitate the separation of the friction disc 82 from the brake disc 81, the part of the guide rod 822 that passes through the brake seat 83 is covered with a spring 824, and a nut 823 is fixed to the end of the guide rod 822. One end of the spring 824 abuts against the nut 823, and the other end of the spring 824 abuts against the outer wall of the brake seat 83, so that the spring 824 gives the friction disc 82 an elastic force away from the brake disc 81.

[0028] The implementation principle of this embodiment is: This embodiment realizes effective locking of the cradle turntable 51 by arranging a locking assembly 7 and a brake assembly 8 on the cradle support 5, thereby improving the machining accuracy of the machine tool during multi-axis linkage. The locking assembly 7 locks the angle of the cradle turntable 51 by inserting the locking rod 73 into the lock hole 71, reducing the impact on the cradle drive motor and the transmission structure, and ensuring the long-term stable operation of the machine tool. As a supplement to the locking assembly 7, the brake assembly 8 can keep the cradle turntable 51 stationary at any angle, further improving the reliability and safety of the machine tool.

[0029] Example 2 The difference between this embodiment and the above embodiment is that the driving element of the locking assembly 7 adopts a hand wheel 77. The hand wheel 77 is fixedly connected with a screw rod 78, and the screw rod 78 is threadedly connected with the end cover 75. When the operator rotates the hand wheel 77, the end of the screw rod 78 can gradually move to one side of the transmission gear 53, and the screw rod 78 is rotationally connected with the pressure cover 74 and can drive the pressure cover 74 to move axially with the screw rod 78. This embodiment is mainly used in the scene where the cutting process does not require the cooperation of the cradle turntable 51.

[0030] The implementation principle of this embodiment is as follows: this embodiment realizes the control of the locking assembly 7 by manually rotating the hand wheel 77, which is suitable for the case where the locking function of the cradle turntable 51 is not frequently used. The design of the hand wheel 77 and the screw 78 is simple and reliable, easy to operate, suitable for use in some special occasions, and further enriches the function of the machine tool.

[0031] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A vertical machine tool for sheet metal processing, comprising a bed (1), the bed (1) being provided with a spindle (41) movable along the X-axis, Y-axis and Z-axis directions, the bed (1) being further provided with two cradle supports (5), a cradle turntable (51) rotating about the X-axis being provided between the two cradle supports (5), one of the cradle supports (5) being provided with a drive box (6), a cradle drive motor and a transmission structure being provided in the drive box (6), a transmission gear (53) fixed to the cradle turntable (51) being provided in the cradle support (5), characterized in that: A locking assembly (7) is provided on a cradle support (5) provided with a driving box (6), the locking assembly (7) comprising a locking hole (71) provided on the end surface of a transmission gear (53), a locking cover (72) fixed on the cradle support (5), and a locking rod (73) slidably provided on the locking cover (72), the movement direction of the locking rod (73) being parallel to the X-axis direction, the locking rod (73) matching the shape of the locking hole (71), and a driving element for driving the locking rod (73) to be inserted into the locking hole (71) is provided on the cradle support (5); A brake assembly (8) is arranged on the other cradle support (5), the brake assembly (8) comprising a brake disc (81) fixed to the cradle turntable (51), a brake seat (83) fixed to the cradle support (5), and a friction disc (82) mounted on the brake seat (83); a plurality of guide rods (822) evenly arranged in a circumference are fixed to the side of the friction disc (82) facing away from the brake disc (81); the guide rods (822) penetrate the brake seat (83) and are slidably matched with the brake seat (83); and the sliding direction of the guide rods (822) is parallel to the X-axis direction; and a driving assembly for driving the friction disc (82) to press against the brake disc (81) is arranged on the cradle support (5).

2. A vertical machine tool for sheet metal processing according to claim 1, characterized in that: The wall of the locking hole (71) has a taper, the inner diameter of the end of the locking hole (71) facing the locking rod (73) is larger, and the inner diameter of the end of the locking hole (71) away from the locking rod (73) is smaller, and the taper of the locking rod (73) is consistent with the taper of the locking hole (71).

3. A vertical machine tool for sheet metal processing according to claim 1, characterized in that: A gear cavity is fixedly formed between the locking cover (72) and the corresponding cradle support (5), and the transmission gear (53) is located in the gear cavity.

4. A vertical machine tool for sheet metal processing according to claim 1, characterized in that: The driving element is a cylinder (76), an end cover (75) is arranged on the cradle support (5), the cylinder (76) is fixed to the end cover (75), the telescopic rod of the cylinder (76) passes through the end cover (75), a pressure cover (74) is fixed to the end of the telescopic rod, and the pressure cover (74) is fixed to a plurality of locking rods (73).

5. A vertical machine tool for sheet metal processing according to claim 1, characterized in that: The driving element is a hand wheel (77), an end cover (75) is arranged on the cradle support (5), the hand wheel (77) is fixedly connected with a screw rod (78), the screw rod (78) is threadedly connected to the end cover (75), the screw rod (78) is rotationally connected to the pressure cover (74) and can drive the pressure cover (74) to move axially along with the screw rod (78).

6. A vertical machine tool for sheet metal processing according to claim 1, characterized in that: The side of the friction disc (82) facing away from the brake disc (81) is also provided with a piston rod (825), and the piston rod (825) is fixed at the center of the friction disc (82); the piston rod (825) passes through the brake seat (83), and the brake seat (83) is provided with a hydraulic housing (84) with an opening at a position corresponding to the piston rod (825), and the opening shape of the hydraulic housing (84) matches the piston rod (825). After the hydraulic housing (84) and the brake seat (83) are fixed, a hydraulic cavity is formed, and the piston rod (825) passing through the brake seat (83) enters the hydraulic cavity. A nozzle (841) is provided on the hydraulic housing (84), and the nozzle (841) is connected to the hydraulic system.

7. A vertical machine tool for sheet metal processing according to claim 6, characterized in that: The hydraulic system comprises a bidirectional pump, which is connected to a nozzle (841) and is used to deliver hydraulic oil into the hydraulic cavity or to extract the hydraulic oil from the hydraulic cavity.

8. A vertical machine tool for sheet metal processing according to claim 7, characterized in that: The portion of the guide rod (822) that passes through the brake seat (83) is covered with a spring (824), and a nut (823) is fixed to the end of the guide rod (822). One end of the spring (824) abuts against the nut (823), and the other end of the spring (824) abuts against the outer wall of the brake seat (83). The spring (824) provides elastic force to move the friction disc (82) away from the brake disc (81).

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