Clamp for numerical control machine tool

Abstract

The clamp for the numerical control machine tool solves the problems that workpieces in different shapes need to be clamped by replacing clamping equipment, and the automatic production effect is poor, the clamp for the numerical control machine tool comprises a machine tool body, a machining cavity is formed in the machine tool body, and a machining part is arranged at the top of the machining cavity; a workpiece clamping assembly is installed in the machining cavity and comprises a fixed clamping piece fixedly installed at one end of the inner bottom wall of the machining cavity and a movable clamping piece installed on the inner bottom wall of the machining cavity in a sliding mode, and a transverse sliding module is arranged between the inner bottom wall of the machining cavity and the movable clamping piece. A clamping space is formed between the fixed clamping piece and the movable clamping piece; in the working process, the movable sliding blocks move along the inclined sliding grooves, the four inclined sliding grooves are arranged to be in an X shape, the clamping rotating sleeve is rotationally installed on the outer side of the circular plate, and longitudinal clamping or transverse clamping is conducted on a plate-shaped workpiece according to the different orientations of the clamping annular cushion.

Description

Technical Field

[0001] The invention belongs to the technical field of numerically controlled machine tools, and in particular relates to a clamp used for numerically controlled machine tools. Background Art

[0002] CNC machine tools are automated machine tools equipped with a program control system that can be used to process workpieces. When processing metal workpieces, different types of CNC machine tools can perform different types of processing on metals, including turning, drilling, boring, milling, etc. Generally, a clamping head for clamping the workpiece is required on the machine tool. When clamping a cylindrical workpiece, a triangular chuck or a square chuck is generally used for clamping. When clamping a plate-shaped workpiece, a clamping cylinder is generally used. This results in the following defects when the machine tool is in production: When mechanical processing is required, the clamping equipment needs to be replaced according to the shape of the workpiece, which makes the automated production effect poor and reduces the processing efficiency. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a clamp for a CNC machine tool, which effectively solves the problem that workpieces of different shapes need to be clamped by replacing clamping equipment and the automated production effect is poor.

[0004] To achieve the above object, the present invention provides the following technical solution: a fixture for a CNC machine tool, comprising a machine tool body, a machining cavity is provided on the machine tool body, a machining part is provided on the top of the machining cavity, and a workpiece clamping assembly is installed inside the machining cavity; The workpiece clamping assembly includes a fixed clamping member fixedly mounted on one end of the inner bottom wall of the processing chamber and a movable clamping member slidably mounted on the inner bottom wall of the processing chamber, a transverse sliding module is arranged between the inner bottom wall of the processing chamber and the movable clamping member, and a clamping space is formed between the fixed clamping member and the movable clamping member; The workpiece clamping assembly comprises a base, an annular limit frame is installed on the top of the base, a rotating plate is rotatably installed on the inner side of the annular limit frame, a gear ring is fixedly installed on the outer side of the rotating plate, a mobile clamping unit is arranged on the rotating plate, and a rotating driving member is installed on the outer side of the rotating plate; The mobile clamping unit includes four inclined slide grooves opened at equal angles on the rotating plate, and the four inclined slide grooves are arranged in an X shape. A mobile sliding block is slidably installed inside the inclined slide groove. A direction adjustment unit is arranged on one side of the mobile sliding block. The direction adjustment unit adjusts the clamping direction. A clamping drive component is arranged on the other side of the mobile sliding block. The clamping drive component is located on the side where the two rotating plates are away from each other.

[0005] Preferably, the rotating driving member includes a gear ring installed on the outer side of the rotating plate, a first gear is meshedly connected below the gear ring, the first gear is fixedly connected to the output shaft of the rotating motor, and the rotating motor is fixedly installed on the base.

[0006] Preferably, the clamping drive member includes an end block fixedly mounted on the moving sliding block near one end of the inner wall of the end of the processing chamber, a guide groove is opened on the end block, a middle slider is arranged between the upper and lower end blocks on the same side, guide rods are symmetrically installed on the upper and lower sides of the middle slider, the guide rods pass through the guide groove, a fixed plate is arranged on the side away from each other of the two middle sliders, the fixed plate is fixedly mounted on the rotating plate, a double-headed screw is rotatably installed between the two fixed plates, the two middle sliders are respectively threadedly connected to two thread grooves of the double-headed screw with opposite directions, one end of the double-headed screw is fixedly connected to the output shaft of the first motor, and the first motor is fixedly mounted on the middle slider.

[0007] Preferably, the direction adjustment unit includes a connecting arm fixedly mounted on an end of the movable sliding block away from the end block, the connecting arm is parallel to the inclined slide groove, a circular plate is installed on the end of the connecting arm close to the axis of the rotating plate, a clamping sleeve is rotatably mounted on the outer side of the circular plate, a clamping annular pad is installed on the outer wall of the clamping sleeve away from the connecting arm, a mounting box is provided on the side of the circular plate close to the rotating plate, the mounting box is fixedly connected to the movable sliding block, a second gear is rotatably mounted inside the mounting box, a connecting shaft is installed between the second gear and the clamping sleeve, the circular plate, the clamping sleeve and the second gear are coaxially arranged, a clamping fixing unit is installed on the mounting box, and an auxiliary fixing unit is installed inside the circular plate.

[0008] Preferably, a plate groove is provided inside the installation box, and a tooth plate is slidably installed inside the plate groove, the tooth plate is meshed with the second gear, a connecting sliding block is provided between the two tooth plates on the same side, two slots are provided on the connecting sliding block, and plug rods are provided on the side where the upper and lower tooth plates are close to each other, and the two plug rods are respectively slidably installed in the two slots.

[0009] Preferably, two sliding grooves are symmetrically provided on the rotating plate, the middle slider and the connecting sliding block are both slidably installed inside the sliding grooves, and the middle slider is located on the side of the connecting sliding block away from the axis of the rotating plate, a rotating screw is rotatably installed on the middle slider, the rotating screw is threadedly connected to the connecting sliding block, a second motor is installed on the side of the middle slider away from the connecting sliding block, and one end of the rotating screw is fixedly connected to the output shaft of the second motor.

[0010] Preferably, the clamping and fixing unit includes a movable groove opened inside the installation box, the movable groove is located on the side of the plate groove away from the second gear, the movable groove is symmetrically provided with a first through groove on the side close to the plate groove, a movable plate is slidably installed inside the movable groove, a pressure rod is symmetrically installed on the side of the movable plate close to the plate groove, a second through groove is opened on the side of the movable groove close to the rotating plate, a pressure plate is slidably installed inside the second through groove, one end of the pressure plate located inside the movable groove is hingedly provided with a connecting rod, and the other end of the connecting rod is hinged to the movable plate.

[0011] Preferably, a spring is symmetrically installed on one side of the movable plate close to the plate slot, one end of the spring is fixedly connected to the inner wall of the movable slot close to the plate slot, a magnetic block is installed on the movable plate, and an electromagnet is fixedly installed on one end of the installation box away from the second gear.

[0012] Preferably, the auxiliary fixing unit includes an internal negative pressure chamber opened inside the circular plate, a rod groove is opened at the end of the connecting arm, a connecting hole is opened at the end of the circular plate away from the connecting arm, the connecting hole corresponds to the clamping annular pad, an external negative pressure chamber is opened inside the clamping sleeve, the external negative pressure chamber is connected with the inner cavity of the clamping annular pad, and the two ends of the clamping sleeve are tightly attached to the outer wall of the circular plate.

[0013] Preferably, a fixed tube is provided at one end of the connecting arm away from the circular plate, and the fixed tube is fixedly mounted on the rotating plate. An insertion tube is installed on the fixed tube, and the end of the insertion tube is located inside the internal negative pressure chamber. The outer wall of the insertion tube is in close contact with the inner wall of the rod groove. An exhaust chamber is opened inside the rotating plate, and the fixed tube is connected to the exhaust chamber. A negative pressure pump is installed on the side of the rotating plate away from the connecting arm, and a connecting tube is installed between the negative pressure pump and the exhaust chamber.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1) During operation, the movable sliding block moves along the inclined slide groove, and the four inclined slide grooves are arranged in an X shape, and a clamping sleeve is installed on the outer side of the circular plate. When the clamping ring pad faces the axis of the rotating plate, the movable sliding block moves to clamp the columnar workpiece, and when the clamping sleeve rotates to the horizontal or vertical direction of the clamping ring pad, the plate-shaped workpiece can be clamped, and the plate-shaped workpiece can be clamped longitudinally or horizontally by the different directions of the clamping ring pad; 2) During operation, the toothed plate is meshed with the second gear, and the upper and lower toothed plates are slidably connected to the connecting sliding block therebetween through an insert rod, and the connecting sliding block is threadedly connected to the rotating screw on the middle slider, so that the relative position of the toothed plate and the second gear can be adjusted conveniently, and the clamping sleeve can be driven to rotate around the outer side of the circular plate, so that the clamping position can be adjusted according to the type of workpiece; 3) During operation, the internal negative pressure chamber is connected to the external negative pressure chamber through the connecting hole, and the external negative pressure chamber is connected to the clamping annular pad, and one end of the insertion tube is located inside the internal negative pressure chamber, so that after the clamping sleeve rotates, the clamping annular pad can always be connected to the exhaust chamber. After the negative pressure pump is turned on, the clamping annular pad generates negative pressure on the workpiece, thereby improving the fixing effect on the workpiece; 4) During operation, the electromagnet is energized to generate repulsive force on the magnetic block, which, on the one hand, pushes the pressure rod through the first through slot and presses against the surface of the tooth plate; on the other hand, the connecting rod pushes the pressure plate and the rotating plate to press against each other, thereby improving the clamping stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0016] In the attached picture: Figure 1 A schematic diagram of a fixture structure for a CNC machine tool according to the present invention; Figure 2 It is a schematic diagram of the structure of the workpiece clamping assembly of the present invention; Figure 3 It is a structural schematic diagram of the mobile clamping unit of the present invention; Figure 4 It is a structural schematic diagram of the direction adjustment unit of the present invention; Figure 5 It is a schematic diagram of the circular plate structure of the present invention; Figure 6 For the present invention Figure 4 The enlarged structural diagram at A in the middle; Figure 7 It is a structural schematic diagram of the pressing and fixing unit of the present invention; Figure 8 For the present invention Figure 4 The enlarged structural diagram at B in the middle; Fig. 9 It is a schematic diagram of the structure of the auxiliary fixing unit of the present invention.

[0017] In the figure: 1, machine tool body; 2, processing cavity; 3, machining part; 4, workpiece clamping assembly; 4a, fixed clamping part; 4b, movable clamping part; 401, base; 402, annular limit frame; 403, rotating plate; 404, gear ring; 405, first gear; 406, rotating motor; 407, mobile clamping unit; 4071, inclined slide; 4072, mobile sliding block; 4073, end block; 4074, guide groove; 4075, middle slider; 4076, guide rod; 4077, fixed plate; 4078, double-headed screw; 4079, first motor; 408, direction adjustment unit; 4081, connecting arm; 4082, circular plate; 4083, clamping sleeve; 4084, clamping annular pad; 4085, installation box; 4086, second gear; 40 87. Sliding groove; 4088. Plate groove; 4089. Connecting sliding block; 40810. Slot; 40811. Tooth plate; 40812. Inserting rod; 40813. Second motor; 40814. Rotating screw; 409. Pressing and fixing unit; 4091. Movable groove; 4092. First through groove; 4093. Movable plate; 4094. Pressing rod; 4095. Spring; 4096. Second through groove; 4097. Pressing plate; 4098. Connecting rod; 4099. Magnetic block; 40910. Electromagnet; 410. Auxiliary fixing unit; 4101. Internal negative pressure chamber; 4102. Rod groove; 4103. Connecting hole; 4104. External negative pressure chamber; 4105. Inserting tube; 4106. Fixing tube; 4107. Exhaust chamber; 4108. Negative pressure pump; 4109. Connecting tube. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] Depend on Figure 1-9 The present invention relates to a clamp for a CNC machine tool, comprising a machine tool body 1, a processing cavity 2 is opened on the machine tool body 1, a machining part 3 is arranged on the top of the processing cavity 2, a workpiece clamping assembly 4 is installed inside the processing cavity 2, the workpiece clamping assembly 4 comprises a fixed clamping part 4a fixedly installed on one end of the inner bottom wall of the processing cavity 2 and a movable clamping part 4b slidably installed on the inner bottom wall of the processing cavity 2, a transverse sliding module is arranged between the inner bottom wall of the processing cavity 2 and the movable clamping part 4b, and a clamping space is formed between the fixed clamping part 4a and the movable clamping part 4b.

[0020] The workpiece clamping assembly 4 includes a base 401, an annular limiting frame 402 is installed on the top of the base 401, a rotating plate 403 is rotatably installed on the inner side of the annular limiting frame 402, a gear ring 404 is fixedly installed on the outer side of the rotating plate 403, a mobile clamping unit 407 is arranged on the rotating plate 403, a rotating driving member is installed on the outer side of the rotating plate 403, the rotating driving member includes a gear ring 404 installed on the outer side of the rotating plate 403, a first gear 405 is meshed and connected below the gear ring 404, the first gear 405 is fixedly connected to the output shaft of the rotating motor 406, and the rotating motor 406 is fixedly installed on the base 401; The mobile clamping unit 407 includes four inclined slide grooves 4071 opened at equal angles on the rotating plate 403, and the four inclined slide grooves 4071 are arranged in an X shape. A mobile sliding block 4072 is slidably installed inside the inclined slide groove 4071. A direction adjustment unit 408 is arranged on one side of the mobile sliding block 4072. The direction adjustment unit 408 adjusts the clamping reverse direction. A clamping driving member is arranged on the other side of the mobile sliding block 4072. The clamping driving member is located on the side where the two rotating plates 403 are away from each other. The holding driving member includes an end block 4073 fixedly installed on one end of the inner wall of the end of the mobile sliding block 4072 close to the processing chamber 2. A guide groove 4074 is arranged on the end block 4073. The same side is moved up and down. A middle slider 4075 is arranged between the two end blocks 4073, and guide rods 4076 are symmetrically installed on the upper and lower sides of the middle slider 4075, and the guide rods 4076 pass through the guide grooves 4074. A fixing plate 4077 is arranged on the side away from each other of the two middle sliders 4075, and the fixing plate 4077 is fixedly installed on the rotating plate 403. A double-headed screw 4078 is rotatably installed between the two fixing plates 4077. The two middle sliders 4075 are respectively threadedly connected with two thread grooves of the double-headed screw 4078 with opposite directions, and one end of the double-headed screw 4078 is fixedly connected to the output shaft of the first motor 4079, and the first motor 4079 is fixedly installed on the middle slider 4075.

[0021] The direction adjustment unit 408 includes a connecting arm 4081 fixedly mounted on the end of the moving sliding block 4072 away from the end block 4073, the connecting arm 4081 is parallel to the inclined slide groove 4071, a circular plate 4082 is installed on the end of the connecting arm 4081 close to the axis of the rotating plate 403, a clamping sleeve 4083 is rotatably mounted on the outer side of the circular plate 4082, a clamping annular pad 4084 is installed on the outer wall of the clamping sleeve 4083 away from the connecting arm 4081, the moving sliding block 4072 moves along the inclined slide groove 4071, and the four inclined slide grooves 4071 are arranged in an X shape, and a clamping sleeve 4083 is rotatably mounted on the outer side of the circular plate 4082, when the clamping annular pad 4084 faces the axis of the rotating plate 403, the moving sliding block 4072 moves along the inclined slide groove 4071, and the four inclined slide grooves 4071 are arranged in an X shape, and a clamping sleeve 4083 is rotatably mounted on the outer side of the circular plate 4082, and when the clamping annular pad 4084 faces the axis of the rotating plate 403, the moving sliding block 40 72 moves, can clamp the columnar workpiece, and when the clamping sleeve 4083 rotates to the horizontal or vertical position of the clamping ring pad 4084, it can clamp the plate-like workpiece, and the plate-like workpiece can be clamped longitudinally or transversely by the clamping ring pad 4084 facing different directions. A mounting box 4085 is provided on the side of the circular plate 4082 close to the rotating plate 403, and the mounting box 4085 is fixedly connected to the movable sliding block 4072. A second gear 4086 is rotatably installed inside the mounting box 4085, and a connecting shaft is installed between the second gear 4086 and the clamping sleeve 4083. The circular plate 4082, the clamping sleeve 4083 and the second gear 4086 are coaxially arranged, and a clamping and fixing unit 409 is installed on the mounting box 4085. An auxiliary fixing unit 410 is installed inside the plate 4082, a plate slot 4088 is provided inside the installation box 4085, a tooth plate 40811 is slidably installed inside the plate slot 4088, the tooth plate 40811 is meshed with the second gear 4086, a connecting sliding block 4089 is provided between the two tooth plates 40811 on the same side, two slots 40810 are provided on the connecting sliding block 4089, and a plug rod 40812 is provided on the side of the upper and lower tooth plates 40811 close to each other, and the two plug rods 40812 are respectively slidably installed inside the two slots 40810, and two sliding grooves 4087 are symmetrically provided on the rotating plate 403, and the middle slider 4075 and the connecting sliding block 4089 are both slidably installed in the sliding groove 4087 The middle slider 4075 is located at a side of the connecting sliding block 4089 away from the axis of the rotating plate 403, a rotating screw 40814 is rotatably installed on the middle slider 4075, and the rotating screw 40814 is threadedly connected to the connecting sliding block 4089, a second motor 40813 is installed on the side of the middle slider 4075 away from the connecting sliding block 4089, one end of the rotating screw 40814 is fixedly connected to the output shaft of the second motor 40813, the tooth plate 40811 is meshed with the second gear 4086, and the upper and lower tooth plates 40811 are both slidably connected to the connecting sliding block 4089 therebetween through the insert rod 40812, and the connecting sliding block 4089 is threadedly connected to the rotating screw 40814 on the middle slider 4075,It is convenient to adjust the relative position of the tooth plate 40811 and the second gear 4086, and it is convenient to drive the clamping sleeve 4083 to rotate around the outer side of the circular plate 4082, so as to adjust the clamping position according to the type of workpiece.

[0022] The pressing and fixing unit 409 includes a movable groove 4091 provided inside the installation box 4085, the movable groove 4091 is located on the side of the plate groove 4088 away from the second gear 4086, a first through groove 4092 is symmetrically provided on the side of the movable groove 4091 close to the plate groove 4088, a movable plate 4093 is slidably installed inside the movable groove 4091, a pressing rod 4094 is symmetrically installed on the side of the movable plate 4093 close to the plate groove 4088, a second through groove 4096 is provided on the side of the movable groove 4091 close to the rotating plate 403, a pressing plate 4097 is slidably installed inside the second through groove 4096, and a connecting rod 4098 is hingedly installed on one end of the pressing plate 4097 located inside the movable groove 4091, The other end of the connecting rod 4098 is hinged to the movable plate 4093. A spring 4095 is symmetrically installed on one side of the movable plate 4093 close to the plate slot 4088. One end of the spring 4095 is fixedly connected to the inner wall of the movable slot 4091 close to the plate slot 4088. A magnetic block 4099 is installed on the movable plate 4093. An electromagnet 40910 is fixedly installed on the end of the mounting box 4085 away from the second gear 4086. When the electromagnet 40910 is energized, a repulsive force is generated on the magnetic block 4099. On the one hand, it pushes the pressure rod 4094 to pass through the first through slot 4092 and press against the surface of the tooth plate 40811. On the other hand, it pushes the pressure plate 4097 to press against the rotating plate 403 through the connecting rod 4098 to improve the clamping stability.

[0023] The auxiliary fixing unit 410 includes an internal negative pressure chamber 4101 opened inside the circular plate 4082, a rod groove 4102 is opened at the end of the connecting arm 4081, a connecting hole 4103 is opened at one end of the circular plate 4082 away from the connecting arm 4081, and the connecting hole 4103 corresponds to the clamping annular pad 4084, an external negative pressure chamber 4104 is opened inside the clamping rotating sleeve 4083, and the external negative pressure chamber 4104 is connected to the inner cavity of the clamping annular pad 4084, and both ends of the clamping rotating sleeve 4083 are tightly attached to the outer wall of the circular plate 4082, and a fixing tube 4106 is provided at one end of the connecting arm 4081 away from the circular plate 4082, and the fixing tube 4106 is fixedly installed on the rotating plate 403, and an insertion tube 4105 is installed on the fixing tube 4106, and the end of the insertion tube 4105 is located inside the internal negative pressure chamber 4101, and the insertion tube 4105 is located inside the internal negative pressure chamber 4101. The outer wall of 105 is in close contact with the inner wall of the rod groove 4102, an exhaust chamber 4107 is opened inside the rotating plate 403, the fixing tube 4106 is connected with the exhaust chamber 4107, a negative pressure pump 4108 is installed on the side of the rotating plate 403 away from the connecting arm 4081, a connecting tube 4109 is installed between the negative pressure pump 4108 and the exhaust chamber 4107, the internal negative pressure chamber 4101 is connected with the external negative pressure chamber 4104 through the connecting hole 4103, and the external negative pressure chamber 4104 is connected with the clamping annular pad 4084, and one end of the insertion tube 4105 is located inside the internal negative pressure chamber 4101, so that after the clamping sleeve 4083 rotates, the clamping annular pad 4084 can always be connected with the exhaust chamber 4107, and after the negative pressure pump 4108 is turned on, the clamping annular pad 4084 generates negative pressure on the workpiece, thereby improving the fixing effect on the workpiece.

[0024] Working principle: When working, first place the workpiece to be machined between the fixed clamping member 4a and the movable clamping member 4b, turn on the lateral moving module, so that the movable clamping member 4b moves toward the fixed clamping member 4a, until the two ends of the workpiece are in contact with the surfaces of the two rotating plates 403 respectively, and then clamp the workpiece; When the workpiece is a columnar workpiece, ensure that the clamping annular pad 4084 is in a corresponding state with the connecting hole 4103, that is, the clamping annular pad 4084 faces the axis of the rotating plate 403, turn on the first motor 4079, and since the two middle sliders 4075 are respectively threadedly connected with the thread grooves in opposite directions on the double-headed screw 4078, the two middle sliders 4075 are driven to approach each other, and the guide rods 4076 on the upper and lower sides of the middle slider 4075 are respectively located inside the guide grooves 4074 on the upper and lower end blocks 4073 on the same side, so that when the middle slider 4075 moves, the moving sliding block 4072 is pulled to move along the inclined sliding groove 4071 toward the axis of the rotating plate 403 until the four clamping annular pads 4084 are in close contact with the outer wall of the workpiece, so that the workpiece is clamped in a centering manner; When the workpiece is a plate-shaped workpiece, the second motor 40813 is turned on. Since the rotating screw 40814 is threadedly connected with the connecting sliding block 4089, the connecting sliding block 4089 is driven to move along the sliding groove 4087. When the two connecting sliding blocks 4089 are close to each other, the tooth plate 40811 is pushed to move toward the side of the installation box 4085 through the insertion rod 40812. Since the tooth plate 40811 is meshed with the second gear 4086, the clamping sleeve 4083 is driven to rotate to the horizontal state of the clamping ring pad 4084. At this time, the plate-shaped workpiece can be clamped longitudinally. When the two connecting sliding blocks 4089 are away from each other, the clamping sleeve 4083 is driven to rotate to the vertical state of the clamping ring pad 4084. At this time, the plate-shaped workpiece can be clamped horizontally. After adjustment, the first motor 4079 is turned on to drive the two middle sliding blocks 4075 to approach each other until the clamping ring pad 4084 is tightly clamped against the surface of the workpiece. Then, the electromagnet 40910 is energized to generate a repulsive force on the magnetic block 4099. On the one hand, the pressure rod 4094 is pushed through the first through slot 4092 and pressed against the surface of the tooth plate 40811 to clamp the clamping direction of the clamping sleeve 4083. On the other hand, the connecting rod 4098 pushes the pressure plate 4097 to move along the second through slot 4096 toward the rotating plate 403 until the pressure plate 4097 is pressed against the rotating plate 403 to improve the clamping stability. During the rotation of the clamping sleeve 4083, the internal negative pressure chamber 4101 is connected with the external negative pressure chamber 4104 through the connecting hole 4103, and the end of the insertion tube 4105 is located inside the internal negative pressure chamber 4101. During the movement of the movable sliding block 4072, the exhaust chamber 4107 is always connected with the internal negative pressure chamber 4101 through the fixed tube 4106 and the insertion tube 4105. After the clamping is completed, the negative pressure pump 4108 is turned on, so that the clamping annular pad 4084 is fixed to the workpiece by negative pressure, further improving the clamping stability of the workpiece. After the workpiece is clamped, it is processed by the machining part 3. At the same time, after the rotating motor 406 is turned on, the rotating plate 403 is driven to rotate inside the annular limit frame 402 through the first gear 405 and the gear ring 404, thereby driving the workpiece to rotate, which is convenient for adjusting the processing position.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixture for a CNC machine tool, comprising a machine tool body (1), characterized in that: The machine tool body (1) is provided with a processing cavity (2), a machining part (3) is arranged on the top of the processing cavity (2), and a workpiece clamping assembly (4) is installed inside the processing cavity (2); The workpiece clamping assembly (4) comprises a fixed clamping member (4a) fixedly mounted on one end of the inner bottom wall of the processing chamber (2) and a movable clamping member (4b) slidably mounted on the inner bottom wall of the processing chamber (2); a transverse sliding module is provided between the inner bottom wall of the processing chamber (2) and the movable clamping member (4b); a clamping space is formed between the fixed clamping member (4a) and the movable clamping member (4b); The workpiece clamping assembly (4) comprises a base (401), an annular limiting frame (402) is installed on the top of the base (401), a rotating plate (403) is rotatably installed on the inner side of the annular limiting frame (402), a gear ring (404) is fixedly installed on the outer side of the rotating plate (403), a movable clamping unit (407) is arranged on the rotating plate (403), and a rotating driving member is installed on the outer side of the rotating plate (403); The mobile clamping unit (407) comprises four inclined slide grooves (4071) which are opened at equal angles on the rotating plate (403), the four inclined slide grooves (4071) are arranged in an X shape, a mobile sliding block (4072) is slidably installed inside the inclined slide groove (4071), a direction adjustment unit (408) is arranged on one side of the mobile sliding block (4072), the direction adjustment unit (408) adjusts the clamping direction, and a clamping driving component is arranged on the other side of the mobile sliding block (4072), and the clamping driving component is located on the side of the two rotating plates (403) away from each other.

2. A fixture for a CNC machine tool according to claim 1, characterized in that: The rotating drive member comprises a gear ring (404) mounted on the outside of the rotating plate (403); a first gear (405) is meshedly connected below the gear ring (404); the first gear (405) is fixedly connected to the output shaft of a rotating motor (406); and the rotating motor (406) is fixedly mounted on the base (401).

3. The fixture for a CNC machine tool according to claim 1, characterized in that: The clamping drive member comprises an end block (4073) fixedly mounted on an end of the inner wall of the movable sliding block (4072) close to the end of the processing chamber (2); a guide groove (4074) is provided on the end block (4073); a middle sliding block (4075) is provided between the upper and lower end blocks (4073) on the same side; guide rods (4076) are symmetrically mounted on the upper and lower sides of the middle sliding block (4075); the guide rods (4076) pass through the guide groove (4074); and the two middle sliding blocks (4075) are separated from each other. A fixed plate (4077) is provided on one side of each of the two fixing plates (4077), the fixed plate (4077) is fixedly mounted on the rotating plate (403), a double-headed screw (4078) is rotatably mounted between the two fixing plates (4077), two middle sliders (4075) are respectively threadedly connected to two thread grooves of the double-headed screw (4078) with opposite directions, one end of the double-headed screw (4078) is fixedly connected to the output shaft of the first motor (4079), and the first motor (4079) is fixedly mounted on the middle slider (4075).

4. The fixture for a CNC machine tool according to claim 1, characterized in that: The direction adjustment unit (408) comprises a connecting arm (4081) fixedly mounted on an end of the movable sliding block (4072) away from the end block (4073), the connecting arm (4081) being parallel to the inclined slide groove (4071), a circular plate (4082) being mounted on an end of the connecting arm (4081) close to the axis of the rotating plate (403), a clamping rotating sleeve (4083) being rotatably mounted on the outer side of the circular plate (4082), a clamping annular pad (4084) being mounted on the outer wall of an end of the clamping rotating sleeve (4083) away from the connecting arm (4081), and a circular plate (4082) being close to the axis of the rotating plate (403). A mounting box (4085) is provided on one side of the rotating plate (403), the mounting box (4085) is fixedly connected to the movable sliding block (4072), a second gear (4086) is rotatably mounted inside the mounting box (4085), a connecting shaft is installed between the second gear (4086) and the clamping rotating sleeve (4083), the circular plate (4082), the clamping rotating sleeve (4083) and the second gear (4086) are coaxially arranged, a pressing and fixing unit (409) is installed on the mounting box (4085), and an auxiliary fixing unit (410) is installed inside the circular plate (4082).

5. A fixture for a CNC machine tool according to claim 4, characterized in that: The installation box (4085) is provided with a plate slot (4088) inside, a tooth plate (40811) is slidably installed inside the plate slot (4088), the tooth plate (40811) is meshed with the second gear (4086), a connecting sliding block (4089) is provided between two tooth plates (40811) on the same side, two slots (40810) are provided on the connecting sliding block (4089), and an insertion rod (40812) is provided on the side of the upper and lower tooth plates (40811) close to each other, and the two insertion rods (40812) are respectively slidably installed inside the two slots (40810).

6. A fixture for a CNC machine tool according to claim 5, characterized in that: The rotating plate (403) is symmetrically provided with two sliding grooves (4087), the middle slider (4075) and the connecting sliding block (4089) are both slidably mounted inside the sliding grooves (4087), and the middle slider (4075) is located on a side of the connecting sliding block (4089) away from the axis of the rotating plate (403), a rotating screw (40814) is rotatably mounted on the middle slider (4075), the rotating screw (40814) is threadedly connected to the connecting sliding block (4089), a second motor (40813) is mounted on a side of the middle slider (4075) away from the connecting sliding block (4089), and one end of the rotating screw (40814) is fixedly connected to an output shaft of the second motor (40813).

7. A fixture for a CNC machine tool according to claim 4, characterized in that: The clamping and fixing unit (409) comprises a movable groove (4091) provided inside the installation box (4085), the movable groove (4091) being located on a side of the plate groove (4088) away from the second gear (4086), a first through groove (4092) being symmetrically provided on a side of the movable groove (4091) close to the plate groove (4088), a movable plate (4093) being slidably installed inside the movable groove (4091), a pressing rod (4094) being symmetrically installed on a side of the movable plate (4093) close to the plate groove (4088), a second through groove (4096) being provided on a side of the movable groove (4091) close to the rotating plate (403), a pressing plate (4097) being slidably installed inside the second through groove (4096), a connecting rod (4098) being hingedly installed on one end of the pressing plate (4097) located inside the movable groove (4091), and the other end of the connecting rod (4098) being hingedly connected to the movable plate (4093).

8. A fixture for a CNC machine tool according to claim 7, characterized in that: A spring (4095) is symmetrically mounted on one side of the movable plate (4093) close to the plate slot (4088); one end of the spring (4095) is fixedly connected to the inner wall of the movable slot (4091) close to the plate slot (4088); a magnetic block (4099) is mounted on the movable plate (4093); and an electromagnet (40910) is fixedly mounted on one end of the mounting box (4085) away from the second gear (4086).

9. The fixture for a CNC machine tool according to claim 4, characterized in that: The auxiliary fixing unit (410) comprises an internal negative pressure chamber (4101) opened inside the circular plate (4082), a rod groove (4102) is opened at the end of the connecting arm (4081), a connecting hole (4103) is opened at one end of the circular plate (4082) away from the connecting arm (4081), the connecting hole (4103) corresponds to the clamping annular pad (4084), an external negative pressure chamber (4104) is opened inside the clamping rotating sleeve (4083), the external negative pressure chamber (4104) is connected to the inner cavity of the clamping annular pad (4084), and the two ends of the clamping rotating sleeve (4083) are in close contact with the outer wall of the circular plate (4082).

10. A fixture for a CNC machine tool according to claim 9, characterized in that: A fixed tube (4106) is provided at one end of the connecting arm (4081) away from the circular plate (4082); the fixed tube (4106) is fixedly mounted on the rotating plate (403); an insertion tube (4105) is mounted on the fixed tube (4106); an end of the insertion tube (4105) is located inside the internal negative pressure chamber (4101); an outer wall of the insertion tube (4105) is in close contact with an inner wall of the rod groove (4102); an exhaust chamber (4107) is provided inside the rotating plate (403); the fixed tube (4106) is connected to the exhaust chamber (4107); a negative pressure pump (4108) is mounted on one side of the rotating plate (403) away from the connecting arm (4081); and a connecting tube (4109) is mounted between the negative pressure pump (4108) and the exhaust chamber (4107).

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