High-precision part production fixing device for CNC machine tool

Abstract

The invention relates to the technical field of CNC machining, and provides a production fixing device for high-precision parts for a CNC machine tool, the production fixing device comprises a base, and two first clamping blocks, six second clamping blocks and four guide rods for guiding the first clamping blocks and the second clamping blocks in a sliding mode are symmetrically arranged on the inner side of the top of the base; when an even number of workpieces need to be machined through the CNC machine tool, the workpieces of the corresponding number can be selected to be evenly dispersed in the first containing groove and clamped and fixed by the second clamping block and the first clamping block in the opposite directions, and when a cardinal number of workpieces need to be machined through the CNC machine tool, the workpieces of the corresponding number can be clamped and fixed through the second clamping block and the first clamping block; according to the clamping device, the corresponding number of workpieces can be selected to be evenly dispersed in the first containing groove and the second containing groove and are oppositely clamped and fixed through the second clamping block and the first clamping block, compared with the prior art, stable fixing of the base number and the even number of workpieces can be achieved, the applicability is better, and the machining efficiency and stability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of CNC machining, and in particular to a production fixture for high-precision parts for CNC machine tools. Background Art

[0002] At present, when processing workpieces on CNC machine tools, especially when processing screw inserts, the cylindrical workpiece is usually clamped on the fixing device (usually a caliper, a chuck, etc.) provided by the CNC machine tool, and then the cylindrical workpiece is processed by the drill bit, the milling head, etc. of the CNC machine tool. Since the processed workpiece needs to be repeatedly disassembled and assembled with the unprocessed workpiece after each processing, the processing efficiency of the CNC machine tool is low.

[0003] To this end, the patent technology with announcement number CN207127573U discloses a CNC workpiece quick fixing device, which includes a clamping member, a fixing member and a mounting seat; the clamping member includes an even number of hydraulic cylinders and an even number of clamping blocks respectively fixedly connected to each hydraulic cylinder; the fixing member includes a fixing block and a workpiece insertion plate arranged at the bottom end of the fixing block; the fixing block is provided with an even number of triangular notches; the workpiece insertion plate is provided with an even number of holes; two mounting plates are respectively arranged on both sides of the side plate, and the two ends of each mounting plate are respectively fixedly connected to the side plate; the CNC workpiece quick fixing device can clamp and fix several workpieces at a time, which is relatively convenient and quick.

[0004] However, the above-mentioned CNC workpiece quick fixing device still has the following problems: the clamping parts used in the above-mentioned CNC workpiece quick fixing device are composed of an even number of hydraulic cylinders and an even number of clamping blocks respectively fixedly connected to the hydraulic cylinders. In order to ensure stability, only an even number of workpieces of one pair or more can be clamped and fixed at a time. When there is a single or more than a single cardinal number of workpieces, the forces on both sides of the clamping blocks are unbalanced, which can easily cause problems of low precision and poor quality of finished products. Summary of the invention

[0005] The present invention provides a production and fixing device for high-precision parts for CNC machine tools, which solves the problem in the prior art that only one or more even number of workpieces can be clamped and fixed at a time in order to ensure stability.

[0006] The technical solution of the present invention is as follows: A production fixture for high-precision parts for CNC machine tools, comprising a base, two first clamping blocks, six second clamping blocks, and four guide rods for slidingly guiding the first clamping blocks and the second clamping blocks are symmetrically arranged on the inner side of the top of the base, the first clamping block and the second clamping block are elastically connected by a spring, and the first clamping block and the second clamping block tend to maintain a certain gap for picking up and placing workpieces under the elastic force of the spring, pushing mechanisms are arranged on the inner sides of both ends of the base, a driving mechanism and a pneumatic mechanism are arranged on the inner side of the bottom of the base, and swinging members that can push the pushing mechanisms to move horizontally toward the second clamping blocks under the drive of the driving mechanism are arranged on both sides of the two pushing mechanisms; The pushing mechanism includes a slide plate capable of sliding horizontally on a base, an air duct fixed on the slide plate and arranged corresponding to the second clamping block, a hollow tube fixed to the outer side surface of the top of the air duct, a radially telescopic stop pin arranged in the hollow tube, and an air plug for controlling the expansion and contraction of the hollow tube in cooperation with the pneumatic mechanism. When the hollow tube is in a contracted state, when the pushing mechanism moves horizontally toward the second clamping block, the second clamping block will not move synchronously with the pushing mechanism. When the hollow tube is in an extended state, when the pushing mechanism moves horizontally toward the second clamping block, the second clamping block can move synchronously with the pushing mechanism.

[0007] Preferably, the base includes two side panels arranged vertically and in parallel, an upper support plate and a lower support plate arranged horizontally are fixed between the two side panels, support frames fixed vertically to the guide rod are fixed at both ends of the two side panels, and a movable groove for limiting the movable position of the two first clamping blocks is opened in the middle position of the top of the two side panels.

[0008] Preferably, sliders are fixed at both ends of the slide plate, and the two side plates are provided with sliding grooves for guiding the sliders to slide horizontally; The air guide tube is provided with a guide cavity which is in communication with the inner cavity of the hollow tube; The two sides of the hollow tube are provided with expansion holes perpendicular to the axial direction of the hollow tube, and one end of the inner side of the two expansion holes is provided with a stop groove; The stop pin has a conical head and a conical inclined groove at one end facing the hollow tube, a stop ring is fixed outside the stop pin and is slidably limited in the stop groove, and the outer end of the stop pin can pass through the telescopic hole; The air plug includes a piston, which is slidably arranged in a hollow tube and tightly fits against the inner wall of the hollow tube. The end of the piston close to the stop pin is conical and is fixed with a guide column passing through between the two stop pins. A pressure cap that matches the conical bevel grooves of the two stop pins is fixed to the outer side of the guide column. The guide column is hollow in design and is used for insertion when the conical head is contracted.

[0009] Preferably, the driving mechanism includes a first cylinder, which is fixed to the top of the lower support plate, and the output end of the first cylinder passes through the lower support plate and is fixed with a lifting plate, and pressure shafts are fixed at both ends of the lifting plate, and the side plate is provided with a guide groove for limiting the vertical sliding of the pressure shaft.

[0010] Preferably, the swing member includes a power arm and a rotating shaft that hinges the power arm to the side plate, the power arm includes a short rod section and a long trunk section, and the short rod section and the long trunk section are distributed at an obtuse angle, a first limiting groove is provided on the short rod section of the power arm, and both ends of the slide plate are fixed with a movable shaft limitedly positioned in the first limiting groove, and a second limiting groove for limiting the pressure shaft is provided on the long trunk section of the power arm.

[0011] Preferably, the pneumatic mechanism includes a second cylinder, which is fixed to the inner side of one of the side plates, and the piston rod of the second cylinder is provided with an air cylinder fixed to the inner side of the other side plate, and the two sides of the air cylinder are connected to the main air pipe, and the main air pipe is connected to the bronchi corresponding to the guide cavity in each air guide tube, and the bronchi are provided with an electromagnetic valve for controlling the opening and closing of the bronchi.

[0012] Preferably, the two first clamping blocks are provided with three first clamping openings on one side facing the second clamping block, the two first clamping blocks are provided with a second clamping opening in the middle of the opposite side, and the two first clamping blocks are provided with a through hole that slides with the guide rod.

[0013] Preferably, the second clamping block is provided with a third clamping opening corresponding to the first clamping opening on one side facing the first clamping block, semicircular grooves slidably matched with the guide rod are provided on both sides of the second clamping block, and a through groove through which the stop pin can pass in the retracted state, and a step groove through which the stop pin cannot pass in the extended state are provided in the middle position of the second clamping block.

[0014] Preferably, the upper support plate is provided with a second placement groove and six arrays of first placement grooves on both sides of the second placement groove.

[0015] Preferably, the first placement groove is located in the area below the opposite first clamping opening and the third clamping opening, and the second placement groove is located in the area below the opposite two second clamping openings.

[0016] The beneficial effects of the present invention are: In the present invention, when it is necessary to perform mechanical processing on an even number of workpieces through a CNC machine tool, a corresponding number of workpieces can be selected to be evenly dispersed in the first placement groove and clamped and fixed by the second clamping block and the first clamping block. When it is necessary to perform mechanical processing on a cardinal number of workpieces through a CNC machine tool, a corresponding number of workpieces can be selected to be evenly dispersed in the first placement groove and the second placement groove and clamped and fixed by the second clamping block and the first clamping block. Compared with the prior art, stable fixation of cardinal number and even number workpieces can be achieved, applicability is better, and processing efficiency and stability are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of a production fixture for high-precision parts for CNC machine tools proposed by the present invention; Figure 2 This is a schematic diagram of a top view of a production fixture for high-precision parts for CNC machine tools proposed by the present invention; Figure 3 A schematic diagram of the side view of a production fixture for high-precision parts for CNC machine tools proposed by the present invention; Figure 4 A schematic diagram of the base structure proposed by the present invention; Figure 5 This is a schematic diagram of the structure of the pushing mechanism proposed by the present invention; Figure 6 This is a schematic diagram of the vertical cross-section structure of the air guide tube and the hollow tube proposed by the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the air guide tube and the hollow tube proposed in the present invention; Figure 8 This is a schematic diagram of the gas plug and stop pin structure proposed by the present invention; Fig. 9 This is a schematic diagram of the structure of the driving mechanism and the swinging member proposed in the present invention; Fig.10 This is a schematic diagram of the pneumatic mechanism structure proposed by the present invention; Fig.11 This is a schematic diagram of the structure of the first clamping block proposed by the present invention; Fig.12 A schematic diagram of a partial cross-sectional structure of a second clamping block proposed by the present invention; In the figure: 1, base; 11, side plate; 12, upper support plate; 13, lower support plate; 14, support frame; 15, movable groove; 16, guide groove; 17, slide groove; 18, first placement groove; 19, second placement groove; 2, first clamping block; 21, first clamping opening; 22, second clamping opening; 23, through hole; 3, second clamping block; 31, third clamping opening; 32, semicircular slot; 33, through slot; 34, step slot; 4, guide rod; 5, spring; 6, driving mechanism; 61, first cylinder; 62, lifting plate; 63, pressing shaft; 7, swinging member; 71, power Arm; 72, rotating shaft; 73, first limiting groove; 74, second limiting groove; 8, pneumatic mechanism; 81, second cylinder; 82, air cylinder; 83, main air pipe; 84, bronchial tube; 85, solenoid valve; 9, pushing mechanism; 91, slide plate; 911, movable shaft; 912, slider; 92, air guide tube; 921, guide cavity; 93, hollow tube; 931, telescopic hole; 932, stop groove; 94, stop pin; 941, conical head; 942, conical inclined groove; 943, stop ring; 95, air plug; 951, piston; 952, guide column; 953, pressure cap. DETAILED DESCRIPTION

[0019] The following will be combined with 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] See also Figure 1 , Figure 2 and Figure 3 The present invention provides a technical solution: a production fixture for high-precision parts for CNC machine tools, comprising a base 1, two first clamping blocks 2, six second clamping blocks 3, and four guide rods 4 for slidingly guiding each first clamping block 2 and each second clamping block 3 are symmetrically arranged on the inner side of the top of the base 1, the first clamping block 2 and the second clamping block 3 are elastically connected by a spring 5, and the first clamping block 2 and the second clamping block 3 tend to maintain a certain gap for picking up and placing workpieces under the elastic force of the spring 5, pushing mechanisms 9 are arranged on the inner sides of both ends of the base 1, and a driving mechanism 6 and a pneumatic mechanism 8 are arranged on the inner side of the bottom of the base 1, and swinging members 7 that can push the pushing mechanisms 9 to move horizontally toward the second clamping blocks 3 under the drive of the driving mechanism 6 are arranged on both sides of the two pushing mechanisms 9.

[0021] See also Figure 5 , Figure 6 and Figure 7The pushing mechanism 9 includes a slide plate 91 capable of sliding horizontally on the base 1, an air guide tube 92 fixed on the slide plate 91 and arranged corresponding to the second clamping block 3, a hollow tube 93 fixed to the outer side of the top of the air guide tube 92, a radially retractable stop pin 94 arranged in the hollow tube 93, and an air plug 95 for controlling the expansion and contraction of the hollow tube 93 in cooperation with the pneumatic mechanism 8. When the hollow tube 93 is in a retracted state, when the pushing mechanism 9 moves horizontally toward the second clamping block 3, the second clamping block 3 will not move synchronously with the pushing mechanism 9. When the hollow tube 93 is in an extended state, when the pushing mechanism 9 moves horizontally toward the second clamping block 3, the second clamping block 3 can move synchronously with the pushing mechanism 9.

[0022] See also Figure 4 The base 1 includes two vertically parallel side panels 11, between which an upper support plate 12 and a lower support plate 13 are fixed horizontally, and at both ends of the two side panels 11, a support frame 14 vertically fixed to the guide rod 4 is fixed, and a movable groove 15 for movable limiting of the two first clamping blocks 2 is opened in the middle position of the top of the two side panels 11.

[0023] Specifically, sliders 912 are fixed at both ends of the slide plate 91, and slide grooves 17 for guiding the sliders 912 to slide horizontally are provided on the two side plates 11; a guide cavity 921 communicating with the inner cavity of the hollow tube 93 is provided in the air guide tube 92; telescopic holes 931 perpendicular to the axial direction of the hollow tube 93 are provided on both sides of the hollow tube 93, and a stop groove 932 is provided at one end of the inner side of the two telescopic holes 931; a conical head 941 is provided at one end of the stop pin 94 facing the inside of the hollow tube 93, and a stop groove 932 is provided at one end of the stop pin 94 facing the inside of the hollow tube 93. The bevel groove 942, the stop pin 94 is fixed with a stop ring 943 that is slidably limited in the stop groove 932, and the outer end of the stop pin 94 can pass through the telescopic hole 931; the air plug 95 includes a piston 951, which is slidably arranged in the hollow tube 93 and fits tightly with the inner wall of the hollow tube 93, and the end of the piston 951 close to the stop pin 94 is conical and fixed with a guide column 952 that passes between the two stop pins 94, and the outer side of the guide column 952 is fixed with a stop ring that is fixed with the two stop pins 94 The pressure cap 953 is matched with the conical inclined groove 942, and the guide column 952 is hollowed out for the cone head 941 to penetrate when it contracts. When the solenoid valve 85 on the pushing mechanism 9 is opened, the second cylinder 81 pushes the piston in the cylinder 82 to compress the air, and introduces the air into the hollow tube 93 corresponding to the second clamping block 3 through the main air pipe 83 and the bronchial pipe 84, so that the air pressure in the hollow tube 93 increases and pushes the piston 951, and the piston 951 pushes the cone heads of the two stop pins 94. 941, thereby the two stop pins 94 extend out from the telescopic hole 931 until the stop ring 943 outside the stop pin 94 conflicts with the stop groove 932, and when the second cylinder 81 is withdrawn, the air pressure in the hollow tube 93 is reduced, and the piston 951 can be reset. In this process, the conical bevel groove 942 is squeezed by the pressure cap 953, so that the conical heads 941 of the two stop pins 94 shrink toward the hollow part of the guide column 952, so that the two stop pins 94 can shrink to the telescopic hole 931.

[0024] See also Figure 3 and Fig. 9The driving mechanism 6 includes a first cylinder 61, which is fixed to the top of the lower support plate 13. The output end of the first cylinder 61 passes through the lower support plate 13 and is fixed with a lifting plate 62. The two ends of the lifting plate 62 are fixed with a pressing shaft 63. The side plate 11 is provided with a guide groove 16 for vertically sliding and limiting the pressing shaft 63. The swing member 7 includes a power arm 71 and a rotating shaft 72 that hinges the power arm 71 to the side plate 11. The power arm 71 includes a short rod section and a long stem section, and the short rod section and the long stem section are distributed at an obtuse angle. The short rod section of the power arm 71 is provided with a first limiting groove 73. The two ends of the slide plate 91 are fixed with a movable shaft 911 limited to the first limiting groove 73. The long stem section of the power arm 71 is provided with a The second limiting groove 74 works through the first cylinder 61 to drive the lifting plate 62 to descend. The pressure shafts 63 at both ends of the lifting plate 62 are limited by the second limiting groove 74 of the power arm 71, driving the left power arm 71 to rotate clockwise, while the right power arm 71 rotates counterclockwise. Then, the first limiting groove 73 of the power arm 71 limits the movable shaft 911 and the sliding guide of the slider 912 in the sliding groove 17 of the side plate 11, forcing the two slides 91 to approach each other. In this process, the hollow tube 93 and the air guide tube 92 in the retracted state of the stop pin 94 can pass through the through groove 33 at the bottom of the second clamping block 3. The stop pin 94 in the extended state contacts the step groove 34, thereby preventing the hollow tube 93 and the air guide tube 92 from passing through the through groove 33.

[0025] See also Fig.10 The pneumatic mechanism 8 includes a second cylinder 81, which is fixed to the inner side of one of the side plates 11. The piston rod of the second cylinder 81 is provided with an air cylinder 82 fixed to the inner side of the other side plate 11. The two sides of the air cylinder 82 are connected with main air pipes 83. The main air pipes 83 are connected with bronchial tubes 84 corresponding to the guide cavities 921 in each air guide tube 92, and the bronchial tubes 84 are provided with electromagnetic valves 85 for controlling the opening and closing of the bronchial tubes 84. The second cylinder 81 works to push the piston in the air cylinder 82 to compress, and introduces the air into the hollow tube 93 corresponding to the second clamping block 3 through the main air pipe 83 and the bronchial tube 84, so that the air pressure in the hollow tube 93 increases and the piston 951 is pushed.

[0026] See also Fig.11 and Fig.12The two first clamping blocks 2 are each provided with three first clamping openings 21 on one side facing the second clamping block 3, and the two first clamping blocks 2 are each provided with a second clamping opening 22 in the middle position of the opposite side. The two first clamping blocks 2 are provided with a through hole 23 that slides with the guide rod 4. The second clamping block 3 is provided with a third clamping opening 31 that corresponds to the first clamping opening 21 on one side facing the first clamping block 2, and semicircular grooves 32 that slide with the guide rod 4 are provided on both sides of the second clamping block 3. The middle position of the second clamping block 3 is provided with a through groove 33 that allows the stop pin 94 to pass through in the retracted state, and a step groove 34 that the stop pin 94 cannot pass through in the extended state. The upper support plate 12 is provided with a second placement groove 19 and six first placement grooves 18 arranged in an array on both sides of the second placement groove 19. The first placement groove 18 is located in the area below the first clamping opening 21 and the third clamping opening 31 relative to each other, and the second placement groove 19 is located in the area below the two relative second clamping openings 22.

[0027] The working principle and use process of the present invention are as follows: Figure 2As shown, seven workpiece placement areas are formed between the six second clamping blocks 3 and the two first clamping blocks 2 above the first placement grooves 18 and the second placement grooves 19. When an even number of workpieces need to be machined by a CNC machine tool, a corresponding number of workpieces can be selected to be evenly dispersed in the first placement grooves 18 and clamped and fixed by the second clamping blocks 3 and the first clamping blocks 2. If two workpieces need to be machined, the two workpieces can be placed in the first placement grooves 18 near the two second clamping blocks 3 at e and f, and the solenoid valves 85 near the two second clamping blocks 3 at e and f are opened, and the other solenoid valves 85 remain closed, and the second cylinder 81 works to push the piston in the cylinder 82 to press The air is introduced into the hollow tube 93 corresponding to the second clamping block 3 through the main air pipe 83 and the bronchial pipe 84, so that the air pressure in the hollow tube 93 increases and pushes the piston 951, and the piston 951 presses the conical heads 941 of the two stop pins 94, so that the two stop pins 94 extend out of the telescopic hole 931 until the stop ring 943 outside the stop pin 94 conflicts with the stop groove 932, and then the first cylinder 61 works to drive the lifting plate 62 to descend, and the pressure shafts 63 at both ends of the lifting plate 62 are limited by the second limit groove 74 of the power arm 71, driving the left power arm 71 to rotate clockwise, while the right power arm 71 rotates counterclockwise, and then the first limit groove 73 of the power arm 71 is pressed against the left power arm 71. Under the limit of the movable shaft 911 and the sliding guide of the slider 912 in the slide groove 17 of the side plate 11, the two slide plates 91 are forced to approach each other. In this process, the hollow tube 93 and the air guide tube 92 in the retracted state of the stop pin 94 can pass through the through groove 33 at the bottom of the second clamping block 3. The stop pin 94 in the extended state abuts against the step groove 34, thereby preventing the hollow tube 93 and the air guide tube 92 from passing through the through groove 33. That is, only the two second clamping blocks 3 at e and f cooperate with the first clamping block 2 to stably clamp and fix the workpiece. Similarly, when four workpieces need to be machined, the four workpieces can be divided into the first placement grooves 1 near the four second clamping blocks 3 at a and b, c and d. 8, and open the electromagnetic valves 85 near the four second clamping blocks 3 at a and b, c and d, and keep the remaining two electromagnetic valves 85 closed, repeat the above process, and the four second clamping blocks 3 at a and b, c and d cooperate with the first clamping block 2 to stably clamp and fix the workpiece. When six workpieces need to be machined, the six workpieces can be divided into the first placement grooves 18 near the six second clamping blocks 3 at a and b, c and d, e and f, and open the electromagnetic valves 85 near the six second clamping blocks 3 at a and b, c and d, e and f, and repeat the above process, and the six first clamping blocks 2 at a and b, c and d, e and f cooperate to stably clamp and fix the workpiece; When it is necessary to perform mechanical processing on a number of workpieces through a CNC machine tool, a corresponding number of workpieces can be selected and evenly dispersed in the first placement groove 18 and the second placement groove 19 and clamped and fixed by the second clamping block 3 and the first clamping block 2. If it is necessary to process one workpiece, one workpiece can be placed in the second placement groove 19 between the two first clamping blocks 2, and the solenoid valve 85 near the two second clamping blocks 3 at e and f is opened, and the other solenoid valves 85 remain closed, and the above-mentioned driving process is repeated, that is, only the two second clamping blocks 3 at e and f cooperate with the first clamping block 2 to stably clamp and fix a single workpiece. Similarly, when it is necessary to perform mechanical processing on three workpieces, the three workpieces can be divided into the first placement groove 19 near the two second clamping blocks 3 at e and f. The solenoid valves 85 near the two second clamping blocks 3 at e and f are opened, and the remaining solenoid valves 85 remain closed, and the above process is repeated. The two second clamping blocks 3 at e and f cooperate with the first clamping block 2 to stably clamp and fix the workpiece. When five workpieces need to be machined, the six workpieces can be divided into the first placement groove 18 near the four second clamping blocks 3 at a and b, c and d, and the second placement groove 19 between the two first clamping blocks 2, and the solenoid valves 85 near the four second clamping blocks 3 at a and b, c and d are opened. The above process is repeated. The four second clamping blocks 3 at a and b, c and d cooperate with the first clamping block 2 to stably clamp and fix the workpiece.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A production fixture for high-precision parts for CNC machine tools, comprising a base (1), characterized in that: Two first clamping blocks (2), six second clamping blocks (3), and four guide rods (4) for slidingly guiding the first clamping blocks (2) and the second clamping blocks (3) are symmetrically arranged on the inner side of the top of the base (1); the first clamping blocks (2) and the second clamping blocks (3) are elastically connected via springs (5); the first clamping blocks (2) and the second clamping blocks (3) tend to maintain a certain gap for picking up and placing workpieces under the elastic force of the springs (5); pushing mechanisms (9) are arranged on the inner side of both ends of the base (1); a driving mechanism (6) and a pneumatic mechanism (8) are arranged on the inner side of the bottom of the base (1); swinging members (7) are arranged on both sides of the two pushing mechanisms (9) and can push the pushing mechanisms (9) to move horizontally toward the second clamping blocks (3) under the drive of the driving mechanism (6); The pushing mechanism (9) comprises a slide plate (91) capable of sliding horizontally on the base (1), an air guide tube (92) fixed on the slide plate (91) and arranged corresponding to the second clamping block (3), a hollow tube (93) fixed to the outer side surface of the top of the air guide tube (92), a stop pin (94) radially telescopically arranged in the hollow tube (93), and an air plug (95) for controlling the expansion and contraction of the hollow tube (93) in cooperation with the pneumatic mechanism (8); when the hollow tube (93) is in a contracted state, when the pushing mechanism (9) moves horizontally toward the second clamping block (3), the second clamping block (3) will not move synchronously with the pushing mechanism (9); when the hollow tube (93) is in an extended state, when the pushing mechanism (9) moves horizontally toward the second clamping block (3), the second clamping block (3) can move synchronously with the pushing mechanism (9).

2. The production fixture for high-precision parts for CNC machine tools according to claim 1, characterized in that: The base (1) comprises two side plates (11) arranged vertically and in parallel, an upper support plate (12) and a lower support plate (13) arranged horizontally are fixed between the two side plates (11), support frames (14) fixed vertically to the guide rods (4) are fixed at both ends of the two side plates (11), and movable grooves (15) for movable limiting of the two first clamping blocks (2) are provided at the middle positions of the tops of the two side plates (11).

3. The production fixture for high-precision parts for CNC machine tools according to claim 2, characterized in that: Slide blocks (912) are fixed at both ends of the slide plate (91), and the two side plates (11) are provided with slide grooves (17) for guiding the slide blocks (912) to slide horizontally; The air guide tube (92) is provided with a guide cavity (921) which is in communication with the inner cavity of the hollow tube (93); Telescopic holes (931) perpendicular to the axial direction of the hollow tube (93) are provided on both sides of the hollow tube (93), and stop grooves (932) are provided at one end of the inner side of the two telescopic holes (931); The stop pin (94) has one end facing the inside of the hollow tube (93) provided with a conical head (941) and a conical inclined surface groove (942); a stop ring (943) is fixed outside the stop pin (94) and is slidably limited in the stop groove (932); and the outer end of the stop pin (94) can pass through the telescopic hole (931); The air plug (95) comprises a piston (951) which is slidably disposed in the hollow tube (93) and is tightly fitted to the inner wall of the hollow tube (93); one end of the piston (951) close to the stop pin (94) is conical and is fixed with a guide column (952) passing through between the two stop pins (94); a pressure cap (953) which is adapted to the conical inclined grooves (942) of the two stop pins (94) is fixed on the outer side of the guide column (952); the guide column (952) is hollowed out and is used for passing through when the conical head (941) is contracted.

4. The production fixture for high-precision parts for CNC machine tools according to claim 3, characterized in that: The driving mechanism (6) comprises a first cylinder (61), the first cylinder (61) being fixed to the top of the lower supporting plate (13), the output end of the first cylinder (61) passing through the lower supporting plate (13) and being fixed with a lifting plate (62), the two ends of the lifting plate (62) being fixed with a pressing shaft (63), and the side plate (11) being provided with a guide groove (16) for limiting the vertical sliding of the pressing shaft (63).

5. The production fixture for high-precision parts for CNC machine tools according to claim 4, characterized in that: The swing member (7) comprises a power arm (71) and a rotating shaft (72) hingedly connecting the power arm (71) to the side plate (11); the power arm (71) comprises a short rod section and a long stem section, and the short rod section and the long stem section are distributed at an obtuse angle; a first limiting groove (73) is provided on the short rod section of the power arm (71); two ends of the slide plate (91) are fixed with a movable shaft (911) limitedly positioned in the first limiting groove (73); and a second limiting groove (74) for limiting the pressure shaft (63) is provided on the long stem section of the power arm (71).

6. The production fixture for high-precision parts for CNC machine tools according to claim 3, characterized in that: The pneumatic mechanism (8) comprises a second cylinder (81), the second cylinder (81) being fixed to the inner side surface of one of the side plates (11), the piston rod of the second cylinder (81) being provided with an air cylinder (82) fixed to the inner side surface of the other side plate (11), the two sides of the air cylinder (82) being connected to a main air pipe (83), the main air pipe (83) being connected to a bronchus (84) corresponding to a guide cavity (921) in each air guide pipe (92), and the bronchus (84) being provided with an electromagnetic valve (85) for controlling the opening and closing of the bronchus (84).

7. The production fixture for high-precision parts for CNC machine tools according to claim 1, characterized in that: The two first clamping blocks (2) are each provided with three first clamping openings (21) on one side facing the second clamping block (3), the two first clamping blocks (2) are each provided with a second clamping opening (22) at the middle of the opposite side, and the two first clamping blocks (2) are each provided with a through hole (23) that is slidably matched with the guide rod (4).

8. The production fixture for high-precision parts for CNC machine tools according to claim 7, characterized in that: A third clamping opening (31) corresponding to the first clamping opening (21) is formed on one side of the second clamping block (3) facing the first clamping block (2); semicircular grooves (32) slidably engaged with the guide rod (4) are formed on both sides of the second clamping block (3); a through groove (33) through which the stop pin (94) can pass in a retracted state, and a step groove (34) through which the stop pin (94) cannot pass in an extended state are formed in the middle of the second clamping block (3).

9. The production fixture device for high-precision parts for CNC machine tools according to claim 2, characterized in that: The upper support plate (12) is provided with a second placement groove (19) and six arrays of first placement grooves (18) on both sides of the second placement groove (19).

10. A production fixture for high-precision parts for CNC machine tools according to claim 9, characterized in that: The first placement groove (18) is located in the area below the opposite first clamping opening (21) and the third clamping opening (31), and the second placement groove (19) is located in the area below the opposite two second clamping openings (22).

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