A quick-change jig for rough and finish boring of inner holes

Abstract

This utility model discloses a quick-change fixture for rough and fine boring of inner holes, comprising: a T-shaped support with a rotating box having an opening on the left side rotatably mounted on its inner side; a circular support sleeve fixedly connected to the right side of the rotating box; four sets of clamping blocks arranged in a ring at equal intervals within the circular support sleeve, with the opposing sides of two opposing clamping blocks being inclined surfaces, and the two opposing inclined surfaces being symmetrically arranged; and a co-drive extrusion assembly installed within the rotating box. This utility model, through a series of structural features, facilitates simultaneous clamping of the cylinder liner from four directions on the outside. By clamping from the four directions towards the center, it achieves a large-area stable clamping effect on the outer side of the cylinder liner, avoiding obstruction of its ends and thus preventing interference when the boring tool cuts into the inner hole. This improves applicability and stability, and facilitates integrated rotary drive or adjustment of the clamped cylinder liner, meeting the needs for cylinder liner rotation adjustment during machining and improving operational flexibility.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, specifically a quick-change fixture for rough and fine boring of inner holes. Background Technology

[0002] Currently, the two-end clamping machining fixtures widely used in the field of high-speed boring machines have significant advantages such as convenient clamping and high machining efficiency, but they still have some drawbacks in the boring of cylinder liner inner holes. Specifically, these drawbacks are as follows: 1. For thin-walled cylinder liners, traditional end clamping methods are prone to reduced clamping stability due to insufficient contact area, and there is also a risk of interference when the boring bar cuts into the inner hole, which greatly limits the applicability of the fixture; 2. When machining the inner side of the cylinder liner, there is often a need for rotation or adjustment, but there is a lack of an integrated cylinder liner adjustment mechanism, resulting in limited functionality and poor flexibility. In view of this, this application proposes a quick-change fixture for rough and finish boring of inner holes to solve the above-mentioned problems. Utility Model Content

[0003] The purpose of this invention is to provide a quick-change fixture for rough and fine boring of inner holes, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a quick-change fixture for rough and finish boring of inner holes, comprising:

[0005] The T-shaped support has a rotating box with an opening on the left side rotatably mounted on its inner side;

[0006] A round support sleeve is fixedly connected to the right side of the rotating box;

[0007] The clamping blocks are arranged in four groups in a ring at equal intervals inside the circular support sleeve. The opposing sides of two opposing clamping blocks are both set as inclined surfaces, and the two opposing inclined surfaces are symmetrically arranged.

[0008] The co-drive extrusion assembly is installed inside the rotating box and makes movable contact with four inclined surfaces. The circular support sleeve is slidably fitted on the co-drive extrusion assembly. A support shaft is rotatably installed on the left side of the co-drive extrusion assembly.

[0009] A multi-stage electric telescopic rod is fixedly installed on the left side wall of the T-shaped support, with its extended end fixedly connected to the left end of the support shaft. The multi-stage electric telescopic rod is used to drive the support shaft to move right and left. The co-drive extrusion assembly is used to extrude and drive the four clamping blocks to move close together when the support shaft moves to the right, and to release the extrusion when the support shaft moves to the left. During rough and fine boring of the inner hole, the four clamping blocks move close together to clamp the outer side of the cylinder liner product simultaneously from four directions.

[0010] The vertical missile support assembly consists of eight groups, which are fixedly connected between the two sides of the corresponding clamping block and the inner side of the circular support sleeve. The vertical missile support assembly is used to guide and elastically store energy when the clamping block moves, and to drive the clamping block to move back and reset when the compression state is released, so as to perform the release operation.

[0011] The rotary drive assembly is fixedly sleeved on the left side of the inner side of the rotating box. A brake motor with an output shaft fixedly connected to the rotary drive assembly is fixedly installed on the left side wall of the T-shaped support. The rotary drive assembly is used to drive the rotating box to rotate. The rotation of the rotating box drives the four clamping blocks to rotate through the round support sleeve, so as to drive the clamped cylinder liner product to rotate or rotate and adjust.

[0012] Preferably, the co-drive extrusion assembly includes a movable disk, four connecting rods, four moving rods, and four extrusion balls. The movable disk is located inside a rotating box, and a support shaft is rotatably mounted at the center of the left side of the movable disk. The four connecting rods are fixedly connected to the right side of the movable disk in an annular pattern with equal spacing. The rotating box is slidably fitted onto the four connecting rods. The right side of the circular support sleeve has four horizontal guide holes in an annular pattern with equal spacing. The connecting rods are slidably fitted into the corresponding horizontal guide holes. The sides of the four connecting rods that are close to each other are welded and fixed to the corresponding moving rods. The circular support sleeve is fitted onto the four moving rods. The four extrusion balls are movably embedded in the ends of the four moving rods that are close to each other. The four extrusion balls are in movable contact with the inclined surfaces of the corresponding clamping blocks.

[0013] Preferably, the vertical missile support assembly includes a rectangular sleeve, a T-shaped guide rod, and a spring. The two sides of the clamping block are welded and fixed to the corresponding rectangular sleeves. The side of the rectangular sleeve near the corresponding connecting rod is set as a sealing structure. The T-shaped guide rod is slidably sleeved in the corresponding rectangular sleeve. One end of the T-shaped guide rod is fixedly connected to the inner wall of the circular support sleeve. The spring is movably sleeved on the corresponding T-shaped guide rod. The two ends of the spring are fixedly connected to the inner wall of the corresponding T-shaped guide rod away from the connecting rod and the inner wall of the rectangular sleeve near the connecting rod, respectively.

[0014] Preferably, the rotary drive assembly includes an internal gear ring and a gear. The internal gear ring is fixedly fitted inside the left side of the rotating box, the gear meshes with the top of the inner side of the internal gear ring, and the gear is fixedly connected to the right end of the output shaft of the brake motor.

[0015] Preferably, anti-slip rubber is glued and fixed to one side of each of the four clamping blocks that are close to each other.

[0016] Preferably, a support bearing is fixedly installed on the right side wall and the bottom inner wall of the T-shaped support, the inner ring of the support bearing is fixedly fitted with the outer side of the rotating box, and a through hole is opened at the center of the right side of the rotating box.

[0017] Preferably, the inner walls of the four sides of the circular support sleeve are provided with limiting holes, which are connected to the corresponding transverse guide holes. The moving rod is located in the corresponding limiting hole and does not contact its inner wall.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. Through the combination of the T-shaped support, rotating box, multi-stage electric telescopic rod, support shaft, round support sleeve, clamping block, anti-slip rubber, joint drive extrusion assembly and vertical missile support assembly, it can drive the four clamping blocks to move and retract in close proximity or move back in opposite directions, so as to achieve the effect of conveniently and directly clamping the cylinder liner synchronously from the outside from four directions. By clamping from the outside four directions towards the middle, it achieves the effect of large-area stable clamping of the cylinder liner and avoids the obstruction of its ends, thereby avoiding interference and obstruction when the boring tool cuts into the inner hole, improving applicability and stability;

[0020] 2. Through the combination of the set brake motor, rotating box, rotary drive assembly, round support sleeve, clamping block, anti-slip rubber, joint drive extrusion assembly and vertical missile support assembly, it can perform integrated rotary drive or rotary adjustment of the clamped cylinder liner, meet the needs of cylinder liner rotation adjustment during processing, and improve the flexibility of use.

[0021] This utility model, through a series of structures, facilitates the simultaneous clamping of the cylinder liner from four directions on the outside by driving the four clamping blocks to move close together or repel each other. By clamping from the four directions on the outside towards the center, it achieves a large-area stable clamping effect on the outer side of the cylinder liner, and avoids obstruction of its ends. This prevents interference when the boring tool cuts into the inner hole, improving applicability and stability. It also facilitates the integrated rotation or adjustment of the clamped cylinder liner, meeting the needs of cylinder liner rotation adjustment during processing and improving the flexibility of use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a quick-change fixture for rough and fine boring of inner holes proposed in this utility model;

[0023] Figure 2 This is a cross-sectional view of a quick-change fixture for rough and fine boring of inner holes proposed in this utility model.

[0024] Figure 3 for Figure 2 A magnified structural diagram of part A in the diagram;

[0025] Figure 4 This is a three-dimensional structural diagram of the moving disk, connecting rod, and circular support sleeve connecting parts of a quick-change fixture for rough and fine boring of inner holes proposed in this utility model.

[0026] In the diagram: 1. T-shaped support; 101. Multi-stage electric telescopic rod; 102. Support shaft; 103. Brake motor; 2. Rotary box; 201. Gear; 202. Internal gear ring; 3. Circular support sleeve; 301. Clamping block; 302. Rectangular sleeve; 303. T-shaped guide rod; 304. Spring; 4. Moving disc; 401. Connecting rod; 402. Moving rod; 403. Extrusion ball; 404. Limiting perforation. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1 to 4 As shown in this embodiment, a quick-change fixture for rough and finish boring of inner holes includes:

[0029] T-shaped support 1, with a rotating box 2 having an opening on the left side rotatably mounted on its inner side;

[0030] The round support sleeve 3 is fixedly connected to the right side of the rotating box 2;

[0031] Clamping blocks 301 are arranged in four groups in a ring at equal intervals inside the circular support sleeve 3. The opposing sides of two clamping blocks 301 are both set as inclined surfaces, and the two opposing inclined surfaces are symmetrically arranged. The other side of the clamping blocks 301 is set as an arc structure.

[0032] The co-drive extrusion assembly is installed inside the rotating box 2 and is in movable contact with four inclined surfaces. The circular support sleeve 3 is slidably sleeved on the co-drive extrusion assembly. The support shaft 102 is rotatably installed on the left side of the co-drive extrusion assembly.

[0033] A multi-stage electric telescopic rod 101 is fixedly installed on the left side wall of the T-shaped support 1, and its extended end is fixedly connected to the left end of the support shaft 102. The multi-stage electric telescopic rod 101 is used to drive the support shaft 102 to move right and left. The co-drive extrusion assembly is used to extrude the four clamping blocks 301 to move close together when the support shaft 102 moves to the right, and to release the extrusion when the support shaft 102 moves to the left. When roughing and finishing the inner hole, the four clamping blocks 301 move close together to clamp the outer side of the cylinder liner product simultaneously from four directions.

[0034] The vertical missile support assembly consists of eight groups, which are respectively fixedly connected between the two sides of the corresponding clamping block 301 and the inner side of the circular support sleeve 3. The vertical missile support assembly is used to guide and elastically store energy when the clamping block 301 moves, and to drive the clamping block 301 to move back and reset when the compression state is released, so as to perform the release clamping work.

[0035] The rotary drive assembly is fixedly sleeved on the left side of the inner side of the rotating box 2. The left side wall of the T-shaped support 1 is fixedly installed with a brake motor 103 whose output shaft is fixedly connected to the rotary drive assembly. The rotary drive assembly is used to drive the rotating box 2 to rotate. The rotation of the rotating box 2 is used to drive the four clamping blocks 301 to rotate through the round support sleeve 3, so as to drive the clamped cylinder liner product to rotate or rotate and adjust.

[0036] In this embodiment, anti-slip rubber is glued and fixed on one side of each of the four clamping blocks 301. The anti-slip rubber is used to increase the anti-slip performance and improve the clamping stability during clamping. Support bearings are fixedly installed on the right side wall and bottom inner wall of the T-shaped support 1. The inner ring of the support bearing is fixedly fitted to the outer side of the rotating box 2. A through hole is opened at the center of the right side of the rotating box 2. The support bearing serves to rotate the rotating box 2.

[0037] Furthermore, such as Figure 2 and 4 As shown, the co-drive extrusion assembly includes a movable disk 4, four connecting rods 401, four moving rods 402, and four extrusion balls 403. The movable disk 4 is located inside the rotating box 2. The support shaft 102 is rotatably installed at the center of the left side of the movable disk 4. The four connecting rods 401 are fixedly connected to the right side of the movable disk 4 in an annular pattern with equal spacing. The rotating box 2 is slidably sleeved on the four connecting rods 401. The right side of the circular support sleeve 3 has four horizontal guide holes in an annular pattern with equal spacing. The connecting rods 401 are slidably sleeved in the corresponding horizontal guide holes. The sides of the four connecting rods 401 that are close to each other are welded and fixed to the corresponding moving rods 402. The circular support sleeve 3 is sleeved on the four moving rods 402. The four extrusion balls 403 are movably embedded in the ends of the four moving rods 402 that are close to each other. The four extrusion balls 403 are in movable contact with the inclined surfaces of the corresponding clamping blocks 301.

[0038] In this embodiment, limiting holes 404 are provided on the inner walls of the four sides of the circular support sleeve 3. The limiting holes 404 are connected to the corresponding transverse guide holes. The moving rod 402 is located in the corresponding limiting holes 404 and does not contact its inner wall, so as to allow the moving rod 402 to pass through. The right side of the rotating box 2 is provided with four rectangular guide holes that are slidably fitted to the outer side of the corresponding connecting rod 401, so as to allow the connecting rod 401 to pass through and to guide its transverse sliding. The center of the left side of the moving disk 4 is fixedly connected to the first bearing. The inner ring of the first bearing is fixedly fitted to the outer side of the support shaft 102, so as to achieve the effect of rotating the moving disk 4. By using the rotational connection method, the rotational torque of the moving disk 4 is effectively avoided from being transmitted to the support shaft 102 when it rotates, thereby avoiding the torsional influence on the support shaft 102.

[0039] In this embodiment, the movable disk 4, four connecting rods 401, four moving rods 402, and four pressing balls 403 work together to drive the four pressing balls 403 to move to the right or back to the left when the support shaft 102 moves to the right or left. When the four pressing balls 403 move to the right, they press the inclined surfaces of the four clamping blocks 301. Under the pressing force, the four clamping blocks 301 move close together to perform clamping work. When the four pressing balls 403 subsequently move back to the left, the pressing state is released.

[0040] Furthermore, such as Figure 2 and 3 As shown, the vertical missile support assembly includes a rectangular sleeve 302, a T-shaped guide rod 303, and a spring 304. The two sides of the clamping block 301 are welded and fixed to the corresponding rectangular sleeve 302. The side of the rectangular sleeve 302 near the corresponding connecting rod 401 is set as a sealing structure. The T-shaped guide rod 303 is slidably sleeved in the corresponding rectangular sleeve 302. One end of the T-shaped guide rod 303 is fixedly connected to the inner wall of the circular support sleeve 3. The spring 304 is movably sleeved on the corresponding T-shaped guide rod 303. The two ends of the spring 304 are fixedly connected to the inner wall of the corresponding T-shaped guide rod 303 away from the connecting rod 401 and the inner wall of the rectangular sleeve 302 near the connecting rod 401, respectively.

[0041] In this embodiment, the rectangular sleeve 302 has a guide hole on the side near the corresponding connecting rod 401 that slides with the outer side of the T-shaped guide rod 303, so that the T-shaped guide rod 303 can pass through and be guided there.

[0042] In this embodiment, the rectangular sleeves 302, T-shaped guide rods 303, and springs 304 work together to perform clamping work when the four clamping blocks 301 move close together. The clamping blocks 301 drive the corresponding two rectangular sleeves 302 to slide outside the two T-shaped guide rods 303 to perform vertical guidance. The rectangular sleeves 302 compress the corresponding springs 304 to store elastic energy, achieving the effect of guiding and storing elastic energy when the clamping blocks 301 move during clamping. When the four clamping blocks 301 are released from the squeezed state, the elastic force of the eight springs 304 in the compressed state is used to drive the four clamping blocks 301 to move outward synchronously through the eight rectangular sleeves 302 to release the clamping state.

[0043] Furthermore, such as Figure 2 As shown, the rotary drive assembly includes an internal gear ring 202 and a gear 201. The internal gear ring 202 is fixedly mounted on the left side of the inner side of the rotating box 2, and the gear 201 meshes with the top of the inner side of the internal gear ring 202. The gear 201 is fixedly connected to the right end of the output shaft of the brake motor 103.

[0044] In this embodiment, the gear 201 is driven to rotate by the internal gear ring 202 and the gear 201, and the gear 201 is driven to rotate by the brake motor 103. The gear 201 drives the internal gear ring 202 that meshes with it to rotate, and the internal gear ring 202 is used to drive the rotating box 2 to rotate.

[0045] It should be noted that the clamping block 301, the round support sleeve 3, the moving plate 4, the connecting rod 401, the moving rod 402, the rectangular sleeve 302, the T-shaped guide rod 303, the internal gear ring 202 and the gear 201 are all preferably made of stainless steel. The advantages of stainless steel are high hardness, high wear resistance and good maintenance-free effect, which ensures long-term connection and support stability.

[0046] It should be further explained that both the brake motor 103 and the multi-stage electric telescopic rod 101 are fixedly equipped with control switches. Each control switch is connected to the corresponding component through a flexible wire. The method of opening and closing the switch by personnel is a mature technology for opening and closing basic electrical components that has been disclosed in this field. The specific working principle and conventional wire connection method will not be detailed here.

[0047] Regarding power supply, given that the roughing and finishing boring internal hole machining site is a machining site with sufficient power supply measures and conditions, all electrical components of this device are connected to the local mains power supply. They are connected to the power input interfaces of each device through conventional power distribution devices such as circuit breakers, contactors, and power modules (not marked in the figure) to form a complete power supply circuit. This power supply scheme is a conventional power distribution method for industrial equipment and is a mature and well-known technical means, so it will not be described in detail here.

[0048] The usage method of this embodiment is as follows: When using the quick-change fixture for rough and fine boring of inner holes, the cylinder liner is placed between the four clamping blocks 301. The multi-stage electric telescopic rod 101 is activated in the forward direction, causing it to drive the moving disk 4 to move to the right via the support shaft 102. The moving disk 4 then drives the four compression balls 403 to move to the right via the four connecting rods 401 and the four moving rods 402. The four compression balls 403 compress the inclined surfaces of the four clamping blocks 301 as they move to the right. Under the compressive force, the four clamping blocks 301 move close together. At this time, the clamping blocks 301 drive the corresponding... The two rectangular sleeves 302 slide outside the two T-shaped guide rods 303 to perform vertical guiding work. The rectangular sleeves 302 compress the corresponding springs 304 to store elastic energy. When the four clamping blocks 301 move close together, they drive the four anti-slip rubbers to clamp the outer side of the cylinder liner product from four directions simultaneously. By clamping from the four directions outside towards the middle, a large-area stable clamping effect is achieved on the outer side of the cylinder liner, and the obstruction of its ends is avoided. This avoids interference and obstruction when the boring tool cuts into the inner hole, thus improving applicability and stability.

[0049] The brake motor 103 drives the gear 201 to rotate, which in turn drives the internal gear ring 202 to rotate. The internal gear ring 202 drives the rotating box 2 to rotate, which in turn drives the four connecting rods 401 to rotate. The four connecting rods 401 drive the moving disk 4 to rotate. At the same time, the four connecting rods 401 drive the circular support sleeve 3 to rotate. The circular support sleeve 3 drives the four clamping blocks 301 to rotate through eight T-shaped guide rods 303 and eight rectangular sleeves 302 in sequence. This drives the clamped cylinder liner to rotate, and performs rotation or adjustment of the cylinder liner. This achieves the effect of integrated rotation or adjustment of the clamped cylinder liner, meets the needs of cylinder liner rotation adjustment during processing, and improves the flexibility of use.

[0050] When it is necessary to release the clamping state, the multi-stage electric telescopic rod 101 is activated in reverse so that it drives the moving plate 4 to move back to the left via the support shaft 102. The moving plate 4 drives the four compression balls 403 to move back to the left in sequence via the four connecting rods 401 and the four moving rods 402, releasing the compression state on the inclined surfaces of the four clamping blocks 301. At this time, the elastic force of the eight springs 304 in the compressed state drives the four clamping blocks 301 to move back outward synchronously through the eight rectangular sleeves 302, thereby releasing the clamping state and allowing the cylinder liner to be removed for replacement.

[0051] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A quick-change fixture for roughing and finishing boring of an inner hole, comprising a T-shaped support (1), characterized in that: include: A T-shaped support (1) has a rotating box (2) with an opening on the left side rotatably mounted on its inner side; The round support sleeve (3) is fixedly connected to the right side of the rotating box (2); Clamping blocks (301) are arranged in four groups in a ring at equal intervals inside the circular support sleeve (3). The opposing sides of two clamping blocks (301) are both set as inclined surfaces, and the two opposing inclined surfaces are symmetrically arranged. The co-drive extrusion assembly is installed in the rotating box (2) and is in contact with the four inclined surfaces. The circular support sleeve (3) is slidably sleeved on the co-drive extrusion assembly. The left side of the co-drive extrusion assembly is rotatably mounted with a support shaft (102). A multi-stage electric telescopic rod (101) is fixedly installed on the left side wall of the T-shaped support (1), and its extended end is fixedly connected to the left end of the support shaft (102). The vertical missile support assembly consists of eight groups, which are respectively fixedly connected between the two sides of the corresponding clamp (301) and the inside of the round support sleeve (3); The rotary drive assembly is fixedly sleeved on the left side inside the rotating box (2), and a brake motor (103) with its output shaft fixedly connected to the rotary drive assembly is fixedly installed on the left side wall of the T-shaped support (1).

2. The quick-change jig for roughing and finishing boring of an inner hole according to claim 1, characterized in that: The combined drive extrusion assembly includes a movable disk (4), four connecting rods (401), four moving rods (402), and four extrusion balls (403). The movable disk (4) is located inside the rotating box (2). The support shaft (102) is rotatably installed at the center of the left side of the movable disk (4). The four connecting rods (401) are fixedly connected to the right side of the movable disk (4) in an annular pattern with equal spacing. The rotating box (2) is slidably sleeved on the four connecting rods (401). The right side of the circular support sleeve (3) is provided with four horizontal guide holes in an annular pattern with equal spacing. The connecting rods (401) are slidably sleeved in the corresponding horizontal guide holes. The sides of the four connecting rods (401) that are close to each other are welded and fixed to the corresponding moving rods (402). The circular support sleeve (3) is sleeved on the four moving rods (402). The four extrusion balls (403) are movably embedded in the ends of the four moving rods (402) that are close to each other. The four extrusion balls (403) are in movable contact with the inclined surfaces of the corresponding clamping blocks (301).

3. The quick-change jig for roughing and finishing boring of holes according to claim 1, characterized in that: The vertical missile support assembly includes a rectangular sleeve (302), a T-shaped guide rod (303), and a spring (304). The two sides of the clamping block (301) are welded and fixed to the corresponding rectangular sleeve (302). The side of the rectangular sleeve (302) near the corresponding connecting rod (401) is set as a sealing structure. The T-shaped guide rod (303) is slidably sleeved in the corresponding rectangular sleeve (302). One end of the T-shaped guide rod (303) is fixedly connected to the inner wall of the circular support sleeve (3). The spring (304) is movably sleeved on the corresponding T-shaped guide rod (303). The two ends of the spring (304) are fixedly connected to the inner wall of the corresponding T-shaped guide rod (303) away from the connecting rod (401) and the inner wall of the rectangular sleeve (302) near the connecting rod (401), respectively.

4. The quick-change jig for roughing and finishing boring of holes according to claim 1, characterized in that: The rotary drive assembly includes an internal gear ring (202) and a gear (201). The internal gear ring (202) is fixedly fitted on the left side of the inner side of the rotating box (2), and the gear (201) meshes on the top of the inner side of the internal gear ring (202). The gear (201) is fixedly connected to the right end of the output shaft of the brake motor (103).

5. The quick-change jig for roughing and finishing boring of holes according to claim 1, characterized in that: Anti-slip rubber is glued and fixed to one side of each of the four clamping blocks (301).

6. The quick-change jig for roughing and finishing boring of holes according to claim 1, characterized in that: Support bearings are fixedly installed on the right side wall and bottom inner wall of the T-shaped support (1). The inner ring of the support bearing is fixedly fitted with the outer side of the rotating box (2). A through hole is opened at the center of the right side of the rotating box (2).

7. The quick-change jig for roughing and finishing boring of holes according to claim 2, characterized in that: Limiting holes (404) are provided on the inner walls of the four sides of the circular support sleeve (3). The limiting holes (404) are connected to the corresponding horizontal guide holes. The moving rod (402) is located in the corresponding limiting hole (404) and does not contact its inner wall.

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