Repeated positioning device for machining center

Abstract

The invention discloses a machining center repeated positioning device, and relates to the technical field of machining centers, the machining center repeated positioning device comprises a workbench, and further comprises a portal frame, a first mounting frame, a material blocking assembly, a clamping assembly, a limiting assembly, a second mounting frame and a pressing assembly; the portal frame is fixedly installed on one side of the top of the workbench. The first mounting frame is vertically and fixedly mounted on one side of the bottom of the workbench. The material blocking assembly is arranged between the bottom of the workbench and the first mounting frame and used for positioning one side of a to-be-machined part. The clamping assembly is installed on the inner wall of the top of the portal frame and used for clamping the material blocking assembly to position the to-be-machined part. The number of the limiting assemblies is two, and the two limiting assemblies are installed at the two ends of the other side of the top of the workbench correspondingly and used for limiting the two ends of a to-be-machined part. The positioning device has the beneficial effects that accurate positioning of the to-be-machined part is achieved, and operation is convenient and fast.

Description

Technical Field

[0001] The present application relates to the technical field of machining centers, and in particular to a repeated positioning device for machining centers. Background Art

[0002] As the manufacturing industry continues to move towards high precision and high efficiency, the positioning accuracy of machining centers, as key equipment for precision machining, is directly related to product quality and production efficiency. From the manufacturing of complex parts in the aerospace field, to the processing of key engine parts in the automotive industry, to the production of precision molds, machining centers are widely used in various manufacturing links with strict precision requirements. In these processing processes, repeated positioning devices play an indispensable role in ensuring the precise position of the workpiece in different processing steps and achieving high-precision processing.

[0003] Most of the existing machining center positioning devices use positioning pins, positioning blocks, etc. for positioning, and then manually clamp and fix them. However, the positioning process of the existing machining center positioning devices is cumbersome to operate, and manual adjustments are frequent, which easily leads to errors in positioning. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a repeated positioning device for a machining center. The advantages of the present invention are: accurate positioning of the parts to be processed is achieved and the operation is convenient.

[0005] To achieve the above objectives, the technical solution adopted in the present application is: a repeated positioning device for a machining center, comprising: a workbench, and also comprising: a gantry, a mounting frame 1, a material stopper assembly, a clamping assembly, a limit assembly, a mounting frame 2 and a clamping assembly; the gantry is fixedly installed on one side of the top of the workbench; the mounting frame 1 is vertically fixedly installed on one side of the bottom of the workbench; the material stopper assembly is arranged between the bottom of the workbench and the mounting frame 1, so as to position one side of the part to be processed; the clamping assembly is installed on the inner wall of the top of the gantry, so as to clamp the material stopper assembly to position the part to be processed; the limit assembly has two groups, and the two groups of the limit assemblies are respectively installed at the two ends of the other side of the top of the workbench, so as to limit the two ends of the part to be processed; the mounting frame 2 is vertically fixedly installed on the other side of the bottom of the workbench; the clamping assembly is installed between the other side of the two ends of the workbench and the mounting frame 2, so as to clamp and position the part to be processed.

[0006] Preferably, the material blocking assembly includes: an electric telescopic rod and a material blocking plate, the electric telescopic rod is vertically fixedly installed at the center position of the bottom inner wall of the mounting frame, an opening is provided on one side of the top of the workbench, the material blocking plate is vertically fixedly installed on the top of the electric telescopic rod, and the material blocking plate passes through the opening.

[0007] Preferably, the clamping assembly comprises: a mounting slot plate, an insert plate, two mounting plates, four tooth plates, four gears and eight clamping plates, the mounting slot plate being horizontally fixedly mounted on the top inner wall of the gantry, the insert plate being inserted into the mounting slot plate, the two sides of the insert plate being respectively slidably arranged with the two side inner walls of the mounting slot plate, the two mounting plates being respectively fixedly mounted on the two sides of the top inner wall of the gantry, the mounting slot plate being located between the two mounting plates, the two tooth plates being a group, and the two groups of tooth plates being respectively fixedly mounted on the insert plate On both sides, two tooth plates 1 in a group are respectively fixedly mounted at the two ends of one side of the plug plate, and openings 2 are opened at both ends of the side away from each other of the two mounting plates, and four gears 1 are respectively vertically arranged in the four openings 2, and the four gears 1 are respectively meshed with the corresponding tooth plates 1, and two clamping plates form a group, and two clamping plates in a group are respectively fixedly mounted at the two ends of the corresponding gear 1, and the ends of the two clamping plates in a group that are away from each other are rotatably mounted through the rotating shaft and the inner walls of the two ends of the corresponding openings 2.

[0008] Preferably, the clamping assembly comprises: an electric telescopic rod 2, a support plate 1, two tooth plates 2, two gears 2 and four clamping plates, the electric telescopic rod 2 is vertically fixedly installed on the center position of the bottom inner wall of the mounting frame 2, the support plate 1 is horizontally fixedly installed on the top of the electric telescopic rod 2, the two tooth plates 2 are vertically fixedly installed on the two ends of the top of the support plate 1, and openings 3 are provided at both ends of the other side of the top of the workbench, the two gears 2 are vertically arranged in the corresponding openings 3, the two gears 2 are meshed with the corresponding tooth plates 2, and the two clamping plates form a group, the two clamping plates in one group are fixedly installed on both sides of the corresponding gear 2, and the sides of the two clamping plates in one group that are away from each other are rotatably installed through the rotating shaft and the inner walls on both sides of the corresponding openings 3.

[0009] Preferably, the limiting assembly includes: a sleeve, an insert block and a buffer spring, the two sleeves are respectively fixedly mounted at both ends of the other side of the top of the workbench, the two insert blocks are inserted into the two corresponding sleeves, the ends of the two insert blocks close to each other and the sides away from the gantry are both set as curved surfaces, and the buffer springs are respectively fixedly mounted between the insert blocks and the ends of the sleeves close to the insert blocks.

[0010] Preferably, the pressing plate is arranged in an arc shape, with the concave portion of the pressing plate facing the workbench, and the clamping plate is arranged in an arc shape, with the concave portion of the clamping plate facing the inserting plate.

[0011] Preferably, a support plate 2 is rotatably mounted on the inner wall of the top of one side of the opening 1 via a torsion spring shaft.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] (1) The present invention proposes a repeated positioning device for a machining center, which comprises a workbench, a gantry, a mounting frame, an electric telescopic rod, a material baffle plate, a mounting groove plate, an insert plate, a mounting plate, a tooth plate, a gear, a clamping plate, a limit assembly, a mounting frame and a clamping assembly. The electric telescopic rod drives the material baffle plate to move up and pushes the insert plate to slide in the mounting groove plate, and the tooth plate moves and drives the gear to rotate, thereby driving the clamping plate to rotate around the rotating shaft and approach the material baffle plate to clamp it. Thus, the material baffle plate is positioned on one side of the part to be processed to prevent it from shifting left and right during processing, thereby realizing accurate positioning of the part to be processed and convenient operation.

[0014] (2) The present invention proposes a repeated positioning device for a machining center, which is provided with an electric telescopic rod 2, a support plate 1, a tooth plate 2, a gear 2 and a clamping plate. The electric telescopic rod 2 extends to drive the support plate 1 to rise, and then the tooth plate 2 rises to drive the gear 2 to rotate, and the clamping plate is driven to rotate around the rotating shaft and clamp the parts to be processed, thereby stabilizing the parts, reducing processing vibration and displacement, and realizing precise positioning of the parts to be processed, and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a stereogram of the present invention.

[0016] Figure 2 It is a stereogram of the front side of the present invention.

[0017] Figure 3 It is a three-dimensional diagram of the side surface of the present invention.

[0018] Figure 4 It is a three-dimensional diagram highlighting the clamping assembly in the present invention.

[0019] Figure 5 It is a three-dimensional diagram highlighting the clamping assembly in the present invention.

[0020] Figure 6 It is a cross-sectional view of the limiting component in the present invention.

[0021] Figure 7 It is a three-dimensional diagram highlighting the installation slot plate in the present invention.

[0022] In the figure: 1. workbench; 201. electric telescopic rod 1; 202. material blocking plate; 301. mounting groove plate; 302. plug plate; 303. mounting plate; 304. tooth plate 1; 305. gear 1; 306. clamping plate; 401. electric telescopic rod 2; 402. support plate 1; 403. tooth plate 2; 404. gear 2; 405. clamping plate; 501. sleeve; 502. plug block; 503. buffer spring; 7. gantry; 8. mounting frame 1; 9. mounting frame 2; 10. support plate 2. DETAILED DESCRIPTION

[0023] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0026] One of the preferred embodiments of the present application is as follows: Figures 1 to 7 As shown, a repeated positioning device for a machining center comprises: a workbench 1, and also comprises: a gantry 7, a mounting frame 8, a material stopper assembly, a clamping assembly, a limiting assembly, a mounting frame 2 9 and a pressing assembly; the gantry 7 is fixedly installed on one side of the top of the workbench 1; the mounting frame 1 8 is vertically fixedly installed on one side of the bottom of the workbench 1; the material stopper assembly is arranged between the bottom of the workbench 1 and the mounting frame 1 8, so as to position one side of the part to be processed; the clamping assembly is installed on the inner wall of the top of the gantry 7, so as to clamp the material stopper assembly to position the part to be processed; there are two groups of limiting assemblies, and the two groups of limiting assemblies are respectively installed at the two ends of the other side of the top of the workbench 1, so as to limit the two ends of the part to be processed; the mounting frame 2 9 is vertically fixedly installed on the other side of the bottom of the workbench 1; the pressing assembly is installed between the other side of the two ends of the workbench 1 and the mounting frame 2 9, so as to press and position the part to be processed.

[0027] When using the repeated positioning device of the machining center, first start the material blocking assembly. The material blocking assembly is used in conjunction with the clamping assembly to prevent the material blocking assembly from shifting left and right during the machining process. Then, the part to be processed is moved onto the workbench 1, so that one side of the part gradually approaches the material blocking assembly. After one side of the part is close to the material blocking assembly, one side of the part to be processed is positioned to ensure that the part is completely fixed in the horizontal direction. While the part to be processed is moving, two sets of limit assemblies are used to limit the two ends of the part to be processed. Then, the clamping assembly is started to clamp and position the part to be processed, further stabilize the part, and reduce vibration and displacement during machining. After the machining is completed, the clamping assembly, the limit assembly, the clamping assembly and the material blocking assembly are closed in turn. The part moves on the workbench 1 and passes directly under the gantry 7. Then, the processed part is removed from the workbench 1 or directly moved to the next position to prepare for the next machining, thereby achieving precise positioning of the part to be processed and convenient operation.

[0028] For further reference, Figure 2-Figure 3 The material blocking assembly includes: an electric telescopic rod 201 and a material blocking plate 202. The electric telescopic rod 201 is vertically fixedly installed at the center position of the bottom inner wall of the mounting frame 8. An opening 1 is opened on one side of the top of the workbench 1. The material blocking plate 202 is vertically fixedly installed on the top of the electric telescopic rod 201, and the material blocking plate 202 passes through the opening 1.

[0029] Start the electric telescopic rod 201 to extend it, driving the baffle plate 202 to move upward, and then move the part to be processed onto the workbench 1. One side of the part gradually approaches the baffle plate 202. After one side of the part is close to the baffle plate 202, one side of the part to be processed is positioned. After the processing is completed, the baffle plate 202 is retracted, and the part moves on the workbench 1 and passes directly under the gantry 7.

[0030] For further reference, Figure 1-Figure 3 , Figure 5 and Figure 7The clamping assembly includes: a mounting slot plate 301, an insert plate 302, two mounting plates 303, four tooth plates 304, four gears 305 and eight clamping plates 306. The mounting slot plate 301 is horizontally fixedly installed on the top inner wall of the gantry 7. The insert plate 302 is inserted into the mounting slot plate 301. The two sides of the insert plate 302 are respectively slidably arranged with the inner walls on both sides of the mounting slot plate 301. The two mounting plates 303 are respectively fixedly installed on the two sides of the top inner wall of the gantry 7. The mounting slot plate 301 is located between the two mounting plates 303. The two tooth plates 304 are a group. The two groups of tooth plates 304 are respectively fixed Installed on both sides of the plug plate 302, two tooth plates 304 in a group are fixedly installed at the two ends of one side of the plug plate 302, and openings 2 are opened at both ends of the side away from each other of the two mounting plates 303. Four gears 305 are vertically arranged in the four openings 2, and the four gears 305 are respectively meshed with the corresponding tooth plates 304. Two clamping plates 306 form a group, and the two clamping plates 306 in a group are fixedly installed at the two ends of the corresponding gears 305. The ends of the two clamping plates 306 in a group away from each other are rotatably installed through the rotating shaft and the inner walls of the two ends of the corresponding openings 2.

[0031] Start the electric telescopic rod 201, which drives the baffle plate 202 to move upward. The baffle plate 202 pushes the plug plate 302 to slide upward in the mounting slot plate 301. The movement of the plug plate 302 drives the tooth plate 304 to move synchronously. The tooth plate 304 thereby drives the gear 305 to rotate. The gear 305 drives the clamping plate 306 to rotate around the rotating shaft, so that the clamping plate 306 rotates in the direction close to the baffle plate 202 until the baffle plate 202 is clamped. The baffle plate 202 positions one side of the part to be processed to prevent the baffle plate 202 from shifting left and right during the processing, thereby achieving accurate positioning of the part to be processed.

[0032] For further reference, Figure 1-Figure 4 and Figure 7 The clamping assembly includes: an electric telescopic rod 2 401, a support plate 1 402, two tooth plates 2 403, two gears 2 404 and four clamping plates 405. The electric telescopic rod 2 401 is vertically fixedly installed at the center position of the bottom inner wall of the mounting frame 2 9, the support plate 1 402 is horizontally fixedly installed on the top of the electric telescopic rod 2 401, the two tooth plates 2 403 are respectively vertically fixedly installed at the two ends of the top of the support plate 1 402, and openings three are opened at both ends of the other side of the top of the workbench 1. The two gears 2 404 are respectively vertically arranged in the corresponding openings three, and the two gears 2 404 are respectively meshed with the corresponding tooth plates 2 403. The two clamping plates 405 form a group. The two clamping plates 405 in one group are respectively fixedly installed on both sides of the corresponding gear 2 404, and the two clamping plates 405 in one group are respectively rotated and installed on the inner walls of the two sides of the corresponding opening three through the rotating shaft.

[0033] Start the electric telescopic rod 2 401 to extend it, driving the support plate 1 402 to rise, and the support plate 1 402 drives the tooth plate 2 403 to rise synchronously, and the tooth plate 2 403 is engaged with the gear 2 404 to drive the gear 2 404 to rotate, and the rotation of the gear 2 404 drives the clamping plate 405 to rotate around the rotating shaft, so that the clamping plate 405 rotates toward the part to be processed until the part is pressed and positioned, further stabilizing the part, reducing vibration and displacement during processing, and realizing precise positioning of the part to be processed, with convenient operation.

[0034] For further reference, Figure 1-Figure 2 , Figure 4 and Figure 6 The limiting assembly includes: a sleeve 501, an insert block 502 and a buffer spring 503. The two sleeves 501 are respectively fixedly installed at the two ends of the other side of the top of the workbench 1. The two insert blocks 502 are inserted into the two corresponding sleeves 501. The ends of the two insert blocks 502 that are close to each other and away from the gantry 7 are both set as curved surfaces. The buffer springs 503 are respectively fixedly installed between the insert blocks 502 and the ends of the sleeves 501 close to the insert blocks 502.

[0035] When the part to be processed is moved onto the workbench 1 and one side of the part gradually approaches the baffle plate 202, the part is pushed so that its two ends contact the curved surface of the insert block 502. As the part is pushed, the insert block 502 retracts into the sleeve 501, compressing the buffer spring 503 until the part reaches a suitable position. At this time, the elastic force of the buffer spring 503 causes the insert block 502 to press tightly against both ends of the part, limiting the two ends of the part to be processed, ensuring that the part is completely fixed in the horizontal direction to avoid left and right deviation during processing.

[0036] For further reference, Figure 1-Figure 5 The clamping plate 405 is arranged in an arc shape, and the concave part of the clamping plate 405 faces the workbench 1 ; the clamping plate 306 is arranged in an arc shape, and the concave part of the clamping plate 306 faces the inserting plate 302 .

[0037] When the clamping plate 405 rotates, it gradually clamps the parts on the workbench 1 to ensure that the parts remain stable during the processing and will not move due to external forces. When the clamping plate 306 rotates, the arc shape of the clamping plate 306 is used to set the clamping insert plate 302.

[0038] For further reference, Figure 1 , Figure 3 and Figure 4 A support plate 2 10 is rotatably mounted on the top inner wall of one side of the opening 1 through a torsion spring shaft.

[0039] Start the electric telescopic rod 201, which drives the baffle plate 202 to rise. During the rising process, the baffle plate 202 will lift the support plate 2 10, causing it to rotate and open around the torsion spring shaft, providing space for the baffle plate 202 to rise and pass through the opening 1. After the processing is completed, the electric telescopic rod 201 is controlled to retract and the baffle plate 202 descends. At this time, the support plate 2 10 is automatically reset under the action of the torsion spring shaft, covering the opening 1 to prevent debris from falling into the opening 1 and not affecting the movement of parts on the workbench 1.

[0040] Working principle: When using the repeated positioning device of the machining center, first start the electric telescopic rod 201 to extend it, driving the baffle plate 202 to move upward. During the rising process, the baffle plate 202 will lift the support plate 10, causing it to rotate and open around the torsion spring shaft, providing space for the baffle plate 202 to rise and pass through the opening 1. The baffle plate 202 pushes the plug plate 302 to slide upward in the installation slot plate 301. The movement of the plug plate 302 drives the tooth plate 1 304 to move synchronously, and the tooth plate 1 304 thereby drives the gear 1 305 to rotate, and the gear 1 305 drives the clamping plate 306 to rotate around the rotating shaft, so that the clamping plate 306 rotates in the direction close to the baffle plate 202 until the baffle plate 202 is clamped, and then the part to be processed is moved onto the workbench 1, and one side of the part gradually approaches the baffle plate 202. After one side of the part is close to the baffle plate 202, one side of the part to be processed is positioned to prevent the baffle plate 202 from shifting left and right during the processing, and then the electric telescopic rod 2 401 is started to extend it, driving the support plate 1 402 to rise, and the support plate 1 402 drives the tooth plate 2 403 to move upward. The gear plate 403 is meshed with the gear 404, driving the gear 404 to rotate. The rotation of the gear 404 drives the clamping plate 405 to rotate around the rotating shaft, so that the clamping plate 405 rotates toward the part to be processed until the part is pressed and positioned, further stabilizing the part and reducing vibration and displacement during processing. When the part to be processed is moved onto the workbench 1 and one side of the part gradually approaches the baffle plate 202, the part is pushed so that its two ends contact the curved surface of the insert block 502. As the part is pushed, the insert block 502 retracts into the sleeve 501, compressing the part. Buffer spring 503, until the part reaches the appropriate position, at which time the elastic force of buffer spring 503 makes the insert block 502 tightly press against the two ends of the part, limiting the two ends of the part to be processed, ensuring that the part is completely fixed in the horizontal position. After the processing is completed, the baffle plate 202 is retracted, and the part moves on the workbench 1, passing directly under the gantry 7, and then the processed part is removed from the workbench 1 or directly moved to the next position to prepare for the next processing, thereby realizing precise positioning of the part to be processed and convenient operation.

[0041] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A repeated positioning device for a machining center, comprising: The workbench (1) is characterized in that it also comprises: Gantry (7): the gantry (7) is fixedly installed on one side of the top of the workbench (1); Mounting frame 1 (8): the mounting frame 1 (8) is vertically fixedly mounted on one side of the bottom of the workbench (1); Material blocking assembly: the material blocking assembly is arranged between the bottom of the workbench (1) and the mounting frame (8) to position one side of the part to be processed; Clamping assembly: the clamping assembly is installed on the inner wall of the top of the gantry (7) to clamp the material blocking assembly to position the part to be processed; Limiting components: There are two groups of the limiting components, which are respectively installed at the two ends of the other side of the top of the workbench (1) to limit the two ends of the workpiece to be processed; Mounting frame 2 (9): the mounting frame 2 (9) is vertically fixedly mounted on the other side of the bottom of the workbench (1); Clamping assembly: The clamping assembly is installed between the other side of the two ends of the workbench (1) and the second mounting frame (9) to clamp and position the parts to be processed.

2. A repeated positioning device for a machining center as claimed in claim 1, characterized in that: The material blocking assembly comprises: an electric telescopic rod (201) and a material blocking plate (202); the electric telescopic rod (201) is vertically fixedly mounted at the center position of the bottom inner wall of the mounting frame (8); an opening (1) is provided on one side of the top of the workbench (1); the material blocking plate (202) is vertically fixedly mounted on the top of the electric telescopic rod (201); and the material blocking plate (202) passes through the opening (1).

3. A repeated positioning device for a machining center as claimed in claim 1, characterized in that: The clamping assembly comprises: a mounting slot plate (301), an insert plate (302), two mounting plates (303), four tooth plates (304), four gears (305) and eight clamping plates (306); the mounting slot plate (301) is horizontally fixedly mounted on the top inner wall of the gantry (7); the insert plate (302) is inserted into the mounting slot plate (301); two sides of the insert plate (302) are respectively slidably arranged with the inner walls on both sides of the mounting slot plate (301); the two mounting plates (303) are respectively fixedly mounted on the two sides of the top inner wall of the gantry (7); the mounting slot plate (301) is located between the two mounting plates (303); the two tooth plates (304) form a group; the two groups of tooth plates (304) are connected to each other. 4) are respectively fixedly installed on both sides of the plug plate (302), the two tooth plates (304) in a group are respectively fixedly installed at the two ends of one side of the plug plate (302), the two ends of the side away from each other of the two mounting plates (303) are each provided with an opening two, the four gears (305) are respectively vertically arranged in the four openings two, the four gears (305) are respectively meshed with the corresponding tooth plates (304), the two clamping plates (306) form a group, the two clamping plates (306) in a group are respectively fixedly installed at the two ends of the corresponding gears (305), and the ends of the two clamping plates (306) in a group away from each other are rotatably installed with the inner walls of the two ends of the corresponding opening two through a rotating shaft.

4. A repeated positioning device for a machining center as claimed in claim 3, characterized in that: The clamping assembly comprises: an electric telescopic rod 2 (401), a support plate 1 (402), two tooth plates 2 (403), two gears 2 (404) and four clamping plates (405), wherein the electric telescopic rod 2 (401) is vertically fixedly installed at the center position of the bottom inner wall of the mounting frame 2 (9), the support plate 1 (402) is horizontally fixedly installed at the top of the electric telescopic rod 2 (401), and the two tooth plates 2 (403) are respectively vertically fixedly installed at the two ends of the top of the support plate 1 (402), and the workbench (1) Both ends of the other side of the top are provided with openings three, the two gears two (404) are respectively vertically arranged in the corresponding openings three, the two gears two (404) are respectively meshed with the corresponding toothed plate two (403), the two clamping plates (405) form a group, the two clamping plates (405) in a group are respectively fixedly installed on the two sides of the corresponding gear two (404), and the two sides of the two clamping plates (405) in a group that are away from each other are respectively rotatably installed through the rotating shaft and the inner walls of the two sides of the corresponding opening three.

5. A repeated positioning device for a machining center as claimed in claim 4, characterized in that: The limiting assembly comprises: a sleeve (501), an insert block (502) and a buffer spring (503); the two sleeves (501) are respectively fixedly mounted at two ends of the other side of the top of the workbench (1); the two insert blocks (502) are inserted into two corresponding sleeves (501); the ends of the two insert blocks (502) close to each other and the sides away from the gantry (7) are both arranged as curved surfaces; the buffer spring (503) is respectively fixedly mounted between the insert block (502) and the end of the sleeve (501) close to the insert block (502).

6. A repeated positioning device for a machining center as claimed in claim 4, characterized in that: The clamping plate (405) is arranged in an arc shape, and the concave part of the clamping plate (405) faces the workbench (1); the clamping plate (306) is arranged in an arc shape, and the concave part of the clamping plate (306) faces the inserting plate (302).

7. A repeated positioning device for a machining center as claimed in claim 2, characterized in that: A support plate 2 (10) is rotatably mounted on the inner wall of the top of one side of the opening 1 via a torsion spring shaft.

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