A jig for drilling cylinder blocks

Abstract

This invention provides a fixture for drilling cylinder blocks, belonging to the field of tooling and fixture technology. It solves the problem of low processing efficiency. It includes a fourth shaft with a bridge plate and a base fixed to the top of the bridge plate. A first groove is provided on the front side of the base, containing two opposing centering clamping blocks. One centering clamping block is fixed to one side wall of the first groove, while the other centering clamping block can move left and right. Each of the opposing ends of the two centering clamping blocks has an annular centering step. A second groove is provided on the front side of the bridge plate, directly below the first groove. The distance between the left and right walls of the second groove is greater than the minimum distance between the two centering clamping blocks. A block-shaped abutment protrudes from the wall of the first groove, located on the same side as the centering clamping block fixed to the base. A vertically movable pressure block is connected to the top of the base, also located on the same side as the abutment. It has the advantages of high processing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of tooling and fixture technology, and relates to a fixture for drilling cylinders. Background Technology

[0002] A hydraulic cylinder (also known as a hydraulic cylinder) is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). The cylinder body is designed in various shapes depending on the specific application. For example... Figure 6 The image shows the cylinder body 12 of a hydraulic cylinder used in an engineering vehicle. It is cylindrical, with an arc-shaped first protrusion 12a protruding from the outer side of one end. The first protrusion 12a has a mounting hole 12a1 concentric with it. The central axis of the mounting hole 12a1 is perpendicular to the central axis of the inner hole of the cylinder body 12. The mounting hole 12a1 is used to install the cylinder body 12 on the engineering vehicle. After installation, the cylinder body 12 can swing around the mounting hole 12a1, and the arc surface on the first protrusion 12a ensures that the first protrusion 12a will not interfere with other positions on the engineering vehicle when the cylinder body 12 swings. In addition, the side of the cylinder body 12 is provided with two second protrusions 12b and one third protrusion 12c. The two second protrusions 12b are parallel, and one of the second protrusions 12b forms an angle with the first protrusion 12a along the circumference of the cylinder body 12. The two second protrusions 12b are provided with oil holes 12b1 that communicate with the inner hole of the cylinder body 12. The two oil holes 12b1 are used for oil inlet and oil outlet, respectively. The third protrusion 12c is located close to the other second protrusion 12b. The third protrusion 12c is provided with a sensor positioning hole 12c1. The sensor positioning hole 12c1 is parallel to the oil hole 12b1. The sensor positioning hole 12c1 is used to install and fix a sensor on the cylinder body 12.

[0003] In practice, the aforementioned mounting hole 12a1, the two oil holes 12b1, and the sensor positioning hole 12c1 are all machined separately after the cylinder body 12 blank is manufactured, and the cylinder body 12 blank is formed by casting. Since the cylinder body 12 is an irregularly shaped part, the first protrusion 12a and the second protrusion 12b have an included angle along the circumference, and the drilling directions of the mounting hole 12a1 and the oil hole 12b1 are completely different, therefore, conventionally, different tooling fixtures are used to perform multiple clamping operations to machine the mounting hole 12a1 and the two oil holes 12b1 and the sensor positioning hole 12c1 respectively, which results in very low processing efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a fixture for drilling cylinder blocks, thereby solving the problem of low processing efficiency.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A jig for drilling cylinder blocks includes a fourth shaft having a bridge plate with its length arranged in a left-right direction and a base fixed to the top of the bridge plate. The base has a first groove on its front side, within which are two centering clamping blocks arranged opposite each other in a left-right direction. One centering clamping block is fixed to one side wall of the first groove, and the other centering clamping block can move left and right to create a gap between them that allows the cylinder block to be inserted. Each of the two centering clamping blocks has an annular centering step at its opposite end. A second groove is located on the front side of the bridge plate, directly below the first groove. The distance between the left and right walls of the second groove is greater than the minimum distance between the two centering clamping blocks. A block-shaped abutment protrudes from the wall of the first groove, located on the same side as the centering clamping block fixed to the base. A vertically movable pressure block is connected to the top of the base, located on the same side as the abutment. Both the pressure block and the abutment are located in front of the central axis of the centering clamping block fixed to the base.

[0007] When machining is required, the movable centering clamping block is moved away from the fixed centering clamping block, so that the distance between the two centering clamping blocks is greater than the length of the cylinder body. The end of the cylinder body with the first protrusion is then placed against the centering step of the fixed centering clamping block, with the first protrusion abutting against the abutting part. Then, the movable centering clamping block is moved towards the fixed centering clamping block, causing its centering step to abut against the other end of the cylinder body, thereby positioning the cylinder body between the two centering clamping blocks. Finally, the pressure block is moved downwards until it presses against the first protrusion. Thus, the cylinder body is clamped and fixed on this fixture. The cylinder body is arranged and clamped on the fixture in the left and right directions by two centering clamping blocks, and the central axis of the cylinder body is positioned. At the same time, the cylinder body is positioned in the circumferential direction by the cooperation of the abutment and the pressure block. The pressure block and the abutment are both located in front of the centering clamping block that is fixed to the base. This ensures that after the cylinder body is positioned in the circumferential direction, the second and third protrusions on its side are facing down and forward and their projections fall into the second groove of the bridge plate. This allows the drill bit or milling cutter to pass through the second groove to process the cylinder body when the fourth axis rotates and the second and third protrusions face up.

[0008] The fourth axis is mounted and fixed on the cross plate of a vertical drilling and milling machine. During machining, a drilling tool is first used to machine mounting holes on the first protrusion. Then, the fourth axis is rotated until the arc surface of the first protrusion faces upwards, and a milling cutter is switched to finish mill the arc surface of the first protrusion. After completing the above machining, the fourth axis is rotated until the two second protrusions and the third protrusion face upwards. The corresponding drilling tool is switched and, in conjunction with the movement of the cross plate, oil holes are machined sequentially on the two second protrusions. Then, keeping the fourth axis stationary, the corresponding drilling tool is switched and, in conjunction with the movement of the cross plate, a transmission mounting hole is machined on the third protrusion. Specifically, after machining the two oil holes, the end faces of the two second protrusions can be finish milled sequentially by switching the milling cutter and, in conjunction with the movement of the cross plate, the end face of the third protrusion can be finish milled by switching the milling cutter and, in conjunction with the movement of the cross plate, after machining the transmission mounting hole. Since the second groove of the bridge plate is located directly below the first groove of the base, and the distance between the left and right sides of the groove wall of the second groove is greater than the distance between the two centering clamping blocks in the clamping state, when the fourth axis rotates to the state where the two second protrusions and the third protrusion are facing upwards, the second groove can make way for the drill bit and the milling cutter, thereby ensuring that the drill bit can smoothly drill oil holes on the second protrusion and sensor positioning holes on the third protrusion, and ensuring that the milling cutter can perform fine milling on the end face of the second protrusion and the end face of the third protrusion.

[0009] By using this fixture, the cylinder body can be machined with mounting holes, oil holes and sensor positioning holes in a single clamping operation, as well as the arc surface on the first protrusion, the end face of the second protrusion and the end face of the third protrusion, thus greatly improving machining efficiency.

[0010] In the aforementioned jig for drilling cylinder blocks, the centering clamping block is T-shaped, with a fixing hole and a guide hole respectively provided at both ends of the base in the left and right directions. The fixing hole and the guide hole are arranged opposite to each other. The centering step is located at the large end of the centering clamping block. The small end of one centering clamping block is fixedly connected in the fixing hole, and the small end of the other centering clamping block is slidably connected in the guide hole. The jig also includes an anti-retraction component, which can abut against the small end of the centering clamping block located at the guide hole in the clamping state.

[0011] The centering clamping blocks are T-shaped. One centering clamping block has its small end fixedly connected to the fixing hole, allowing it to be fixed within the first groove. The small end of the other centering clamping block is slidably connected to the guide hole, allowing it to move left and right within the first groove to clamp or release the cylinder. After the two centering clamping blocks are inserted into the cylinder ends to form a clamp, an anti-retraction component abuts against the small end of the centering clamping block located at the guide hole to create an anti-retraction force, ensuring that the centering clamping block at the guide hole will not retract during processing. This improves processing efficiency while ensuring processing accuracy.

[0012] In the aforementioned jig for drilling cylinder blocks, a locking block is hinged to one end of the base with a guide hole and a limit rod is threadedly connected in the left-right direction. The locking block is strip-shaped in the front-back direction, and the locking block is hinged to the base at its rear end. A mating groove is provided on the lower side of the front end of the locking block. An anti-retraction member is rod-shaped and passes through the middle of the locking block in the left-right direction. The anti-retraction member is threadedly connected to the locking block. The locking block can swing around the hinge point until the limit rod abuts against the mating groove. When the limit rod abuts against the mating groove, the anti-retraction member is directly opposite the small end of the centering clamping block located at the guide hole.

[0013] After the two centering clamping blocks are inserted into the cylinder body at both ends, the locking block is flipped around the hinge point until the limiting rod abuts against the mating groove. At this time, the anti-retraction component threaded onto the locking block is aligned with the small end of the centering clamping block located at the guide hole. Then, the anti-retraction component is rotated to move along the thread and press against the small end of the centering clamping block located at the guide hole. This creates an anti-retraction force on the centering clamping block, ensuring that the cylinder body is firmly positioned between the two centering clamping blocks, thus ensuring both processing efficiency and processing accuracy.

[0014] After the anti-reverse component is rotated in the opposite direction to separate it from the centering clamping block located at the guide hole, the anti-reverse force applied to the centering clamping block is canceled, and the operator can push the centering clamping block towards its smaller end to release the cylinder. In this design, the locking block is hinged to the base. The advantage of this design is that the locking block can be rotated to make room, ensuring that the locking block does not affect the release of the cylinder by the centering clamping block located at the guide hole.

[0015] In one of the above-mentioned jigs for drilling cylinders, as another technical solution, a bracket is fixedly connected to one end of the base with a guide hole, and the anti-retraction component is a cylinder fixedly connected to the bracket. The piston rod of the cylinder is arranged in the left-right direction, and the small end of the centering clamping block located at the guide hole is arranged opposite to the piston rod of the cylinder.

[0016] The anti-retraction component is a cylinder fixedly connected to the bracket. The piston rod of the cylinder is set in the left-right direction. The small end of the centering clamping block located at the guide hole is set opposite to the piston rod of the cylinder. After the two centering clamping blocks are inserted into the two ends of the cylinder body respectively, they are pushed out by the piston rod of the cylinder and pressed against the small end of the centering clamping block located at the guide hole. This can form an anti-retraction force on the centering clamping block, so that the cylinder body is firmly positioned between the two centering clamping blocks, ensuring both processing efficiency and processing accuracy.

[0017] After the piston rod of the cylinder retracts, the anti-retraction force applied to the centering clamping block located at the guide hole is canceled, and the operator can push the centering clamping block towards its small end to release the cylinder body.

[0018] In the aforementioned jig for drilling cylinder blocks, a shoulder is provided in the guide hole, and the small end of the centering clamping block located at the guide hole has a shoulder. The small end of the centering clamping block passes through the shoulder and is threadedly connected to an anti-disengagement ring. A preload spring is sleeved on the small end of the centering clamping block, and the two ends of the preload spring abut against the shoulder and the shoulder of the centering clamping block, respectively.

[0019] The two ends of the preload spring abut against the shoulder inside the guide hole and the shoulder of the small end of the centering clamping block located at the guide hole, respectively. This preload spring exerts a force on the centering clamping block, ensuring it always tends to move towards the centering clamping block located at the fixing hole. Thus, after the two centering clamping blocks are inserted into the cylinder ends, the preload spring alone provides a certain anti-retraction force. The advantage of this design is that after the anti-retraction component separates from the centering clamping block at the guide hole, the preload spring ensures that the force applied to the centering block at the guide hole does not instantly drop to zero, preventing the cylinder from accidentally loosening and falling off, thus improving reliability.

[0020] Furthermore, the presence of the preload spring will not affect the normal clamping of the cylinder body on the fixture. During clamping, it is only necessary to push the centering clamping block located at the guide hole away from the fixing hole to overcome the elastic force of the preload spring so that a gap is formed between the two centering clamping blocks for the cylinder body to be inserted.

[0021] In the above-mentioned jig for drilling cylinder blocks, a slot is provided on the outer periphery of the small end of the centering clamping block located at the guide hole. The centering clamping block can be moved away from the fixing hole until the slot is located outside the base. The jig also includes an insert plate that can be inserted into the slot.

[0022] Because the preloaded spring causes the centering clamping block located at the guide hole to always tend to move toward the centering clamping block located at the fixed hole, in order to improve the convenience of operation and processing efficiency, a slot is provided on the outer periphery of the small end of the centering clamping block located at the guide hole, and an insert plate that can be inserted into the slot is provided. In this way, when the centering clamping block located at the guide hole moves away from the fixed hole to form a gap between the two centering clamping blocks that allows the cylinder to be inserted, the slot moves away from the base along with the small end of the centering clamping block. The operator only needs to insert the insert plate into the slot to position the centering clamping block away from the centering clamping block located at the fixed hole.

[0023] In the aforementioned jig for drilling cylinder blocks, the centering clamping block located at the fixed hole has a through water passage in the left-right direction.

[0024] Connect the water inlet to the water tank of the processing equipment. After machining the two oil holes, water is injected into the inner bore of the cylinder through the water inlet. Since the two machined oil holes are connected to the inner bore of the cylinder, the water injected into the inner bore of the cylinder will flow out from the two machined oil holes, washing away the debris generated during processing, further improving processing efficiency. In particular, the inner bore of the cylinder is larger than the oil hole size. When water flows from the inner bore of the cylinder into the oil holes, it naturally creates a pressurization effect, thereby achieving a better cleaning effect.

[0025] Conventionally, after machining, the cylinder body is removed from the fixture and then cleaned using a separately designed air gun. This solution, however, involves clamping the cylinder body laterally and incorporating water holes in the centering clamping blocks. This, combined with the dimensional changes from the cylinder body's inner bore to the oil hole, creates natural pressure, allowing for cleaning without removing the cylinder body from the fixture.

[0026] In the aforementioned jig for drilling cylinder blocks, a clamping screw is threadedly connected to the top of the base, and a pressure block is sleeved on the rod portion of the clamping screw.

[0027] The pressure block is fitted onto the rod of the clamping screw. By tightening the clamping screw, the head of the clamping screw can press the pressure block against the first protrusion of the cylinder body. When the clamping screw is unscrewed, the pressure block can move along the clamping screw to make way for the disassembly of the cylinder body.

[0028] Compared with the prior art, the jig for drilling cylinder blocks has a second groove on the front side of the bridge plate and a first groove on the front side of the base. Two centering clamping blocks are located in the first groove along the left-right direction. These two centering clamping blocks arrange and clamp the cylinder block on the jig in the left-right direction and position the cylinder block's central axis. Simultaneously, the engagement of the abutment and the pressure block achieves circumferential positioning of the cylinder block. Furthermore, since both the pressure block and the abutment are located in front of the centering clamping blocks fixed to the base, the circumferential positioning of the cylinder block is achieved. The second and third protrusions on its side are positioned downwards and forwards, with their projections falling into the second groove of the bridge plate. This allows the drill bit or milling cutter to pass through the second groove to machine the cylinder body when the fourth axis rotates so that the second and third protrusions are facing upwards. As a result, the cylinder body can be machined with mounting holes, oil holes, and sensor positioning holes, as well as the arc surface on the first protrusion, the end face of the second protrusion, and the end face of the third protrusion, all with only one clamping operation. This greatly improves the machining efficiency. Attached Figure Description

[0029] Figure 1 This is a three-dimensional schematic diagram of a fixture used for drilling cylinder blocks.

[0030] Figure 2 This is a three-dimensional schematic diagram of the jig used for drilling cylinder blocks after the cylinder block has been clamped.

[0031] Figure 3 This is a three-dimensional schematic diagram of the jig used for drilling cylinder blocks after the cylinder block has been clamped.

[0032] Figure 4 This is a cross-sectional view of the jig used for drilling cylinder blocks after the cylinder block has been clamped.

[0033] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0034] Figure 6 This is a three-dimensional schematic diagram of the cylinder block.

[0035] In the diagram, 1 is the bridge plate; 1a is the second groove; 2 is the base; 2a is the first groove; 2b is the abutment part; 2b1 is the abutment surface; 2c is the fixing hole; 2d is the guide hole; 2d1 is the shoulder; 3 is the centering clamping block; 3a is the centering step; 3b is the shaft shoulder; 3c is the slot; 3d is the water passage hole; 4 is the pressure block; 5 is the clamping screw; 6 is the anti-retraction part; 7 is the locking block; 7a is the mating groove; 8 is the limit rod; 9 is the anti-detachment ring; 10 is the hinge screw; 11 is the preload spring; 12 is the cylinder body; 12a is the first protrusion; 12a1 is the mounting hole; 12b is the second protrusion; 12b1 is the oil hole; 12c is the third protrusion; 12c1 is the sensor positioning hole. Detailed Implementation

[0036] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0037] Example 1

[0038] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a jig for drilling cylinder blocks includes a fourth shaft with a bridge plate 1 and a base 2 fixed to the top of the bridge plate 1. The bridge plate 1 is arranged along the left and right sides in its length direction. The front side of the base 2 has a first recessed groove 2a. Specifically, the base 2 is U-shaped. Two opposing centering clamping blocks 3 are arranged in the first groove 2a along the left and right directions. One centering clamping block 3 is fixed to one side wall of the first groove 2a, and the other centering clamping block 3 can move left and right to form a gap between the two centering clamping blocks 3 that allows the cylinder block 12 to be inserted. The opposite ends of the two centering clamping blocks 3 each have an annular centering step 3a. The front side of the bridge plate 1 has a second recessed groove 1a, which is located directly below the first groove 2a. The distance between the left and right side walls of the second groove 1a is greater than the gap between the two centering clamping blocks 3 in the clamping state. The first groove 2a has a protruding, block-shaped abutment 2b on its groove wall. The abutment 2b has a horizontally oriented abutment surface 2b1. The abutment 2b and the centering clamping block 3, which is fixed to the base 2, are located on the same side. A vertically connected pressure block 4 is connected to the top of the base 2. The pressure block 4 and the abutment 2b are located on the same side of the base 2, both in front of the central axis of the centering clamping block 3, which is fixed to the base 2. A clamping screw 5 is threaded to the top of the base 2. The pressure block 4 is sleeved on the rod portion of the clamping screw 5, and rests between the top surface of the base 2 and the head of the clamping screw 5. In this embodiment, the centering clamping block 3 is T-shaped. The base 2 has a fixing hole 2c and a guide hole 2d at both ends along the left and right directions, respectively. The fixing hole 2c and guide hole 2d are opposite to each other and both communicate with the first groove 2a. The centering step 3a is located at the large end of the centering clamping block 3. The small end of one of the centering clamping blocks 3 is fixedly connected to the fixing hole 2c. The centering clamping block 3 located at the fixing hole 2c has a through water passage hole 3d along the left and right directions. The small end of the other centering clamping block 3 is slidably connected to the guide hole 2d. This clamp also includes an anti-retraction component 6, which can abut against the small end of the centering clamping block 3 located at the guide hole 2d in the clamping state.

[0039] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, a locking block 7 is hinged to one end of the base 2 with a guide hole 2d and a limit rod 8 is threadedly connected in the left-right direction. The locking block 7 is strip-shaped in the front-back direction. The locking block 7 is hinged to the base 2 at its rear end. Specifically, a hinge screw 10 is threadedly connected to the base 2. The rear end of the locking block 7 has a hinge hole. The rod part of the hinge screw 10 passes through the hinge hole. The lower side of the front end of the locking block 7 has a mating groove 7a. The anti-retraction member 6 is rod-shaped and passes through the middle of the locking block 7 in the left-right direction. The anti-retraction member 6 is threadedly connected to the locking block 7. The locking block 7 can swing around the hinge point until the limit rod 8 abuts against the mating groove 7a. When the limit rod 8 abuts against the mating groove 7a, the anti-retraction member 6 is directly opposite the small end of the centering clamping block 3 located at the guide hole 2d. Furthermore, a shoulder 2d1 is provided inside the guide hole 2d, and the small end of the centering clamping block 3 located at the guide hole 2d has a shoulder 3b. The small end of the centering clamping block 3 passes through the shoulder 2d1 and is threadedly connected to an anti-disengagement ring 9. A preload spring 11 is sleeved on the small end of the centering clamping block 3, and the two ends of the preload spring 11 abut against the large end of the centering clamping block 3 and the shoulder 2d1, respectively. The anti-disengagement ring 9 is clearance-fitted with the guide hole 2d. A slot 3c is provided on the outer periphery of the small end of the centering clamping block 3 located at the guide hole 2d. The centering clamping block 3 can move in the left and right direction until the slot 3c is located outside the base 2. This fixture also includes an insert plate that can be inserted into the slot 3c.

[0040] In the initial state, the centering clamping block 3 located at the guide hole 2d is subjected to the elastic force of the preload spring 11, making the distance between the two centering clamping blocks 3 less than the length of the cylinder body 12. When machining is required, the centering clamping block 3 located at the guide hole 2d is moved away from the other centering clamping block 3, so that the distance between the two centering clamping blocks 3 is greater than the length of the cylinder body 12. One end of the cylinder body 12 with the first protrusion 12a is placed against the centering step 3a of the centering clamping block 3 located at the fixing hole 2c, and the first protrusion 12a is placed against the abutting surface 2b1 of the abutting part 2b. Then, the centering clamping block 3 located at the guide hole 2d is released, so that the centering clamping block 3 will move under the action of the preload spring 11 and make the centering step 3a on it abut against the other end of the cylinder body 12. Next, the locking block 7 is flipped around the hinge point until the limiting rod 8 abuts against the mating groove 7a. The anti-retraction member 6, threaded onto the locking block 7, is aligned with the small end of the centering clamping block 3 located at the guide hole 2d. Then, the anti-retraction member 6 is rotated to move along the thread and press against the small end of the centering clamping block 3 located at the guide hole 2d. The anti-disengagement member holds the centering clamping block 3 in place, creating an anti-retraction force, thereby firmly positioning the cylinder body 12 between the two centering clamping blocks 3. Finally, the pressure block 4 is rotated around the clamping screw 5 until it is partially above the first protrusion 12a of the cylinder body 12, and the rotating rod is rotated to press the pressure block 4 against the first protrusion 12a. Thus, the clamping and fixing of the cylinder body 12 on this fixture is completed. Figure 2 , Figure 3 and Figure 4 As shown, the cylinder body 12 is arranged and clamped in the left and right direction on this fixture by two centering clamping blocks 3, and the central axis of the cylinder body 12 is positioned. At the same time, the cylinder body 12 is positioned in the circumferential direction by the cooperation between the abutting surface 2b1 on the abutting part 2b and the pressure block 4. The second protrusion 12b and the third protrusion 12c on the side of the cylinder body 12 are in a state of facing downward and forward and their projection falls into the second groove 1a of the bridge plate 1.

[0041] The fourth axis is mounted and fixed on the cross plate of a vertical drilling and milling machine. During machining, a mounting hole 12a1 is first machined on the first protrusion 12a using a drill bit. Then, the fourth axis is rotated until the arc surface of the first protrusion 12a faces upwards. The milling cutter is then switched to perform fine milling on the arc surface of the first protrusion 12a. After completing the above machining, the fourth axis is rotated until the two second protrusions 12b and the third protrusion 12c face upwards. The corresponding drill bit is switched and, in conjunction with the movement of the cross plate, oil holes 12b1 are machined sequentially on the two second protrusions 12b. Then, keeping the fourth axis stationary, the corresponding drill bit is switched again and, in conjunction with the movement of the cross plate, a transmission mounting hole 12a1 is machined on the third protrusion 12c. After machining the two oil holes 12b1, the end faces of the two second protrusions 12b can be precision milled sequentially by switching the milling cutter and coordinating with the movement of the cross plate. Similarly, after machining the transmission mounting hole 12a1, the end face of the third protrusion 12c can be precision milled by switching the milling cutter and coordinating with the movement of the cross plate. Since the second groove 1a of the bridge plate 1 is located directly below the first groove 2a of the base 2, and the distance between the left and right sides of the groove wall of the second groove 1a is greater than the distance between the two centering clamping blocks 3 in the clamping state, when the fourth axis rotates to the state where the two second protrusions 12b and the third protrusion 12c are facing upwards, the second groove 1a can make way for the drill bit and the milling cutter, thereby ensuring that the drill bit can smoothly drill the oil hole 12b1 on the second protrusion 12b and the sensor positioning hole 12c1 on the third protrusion 12c, and ensuring that the milling cutter can precision mill the end faces of the second protrusion 12b and the third protrusion 12c.

[0042] By using this fixture, the cylinder body 12 can complete the machining of the mounting hole 12a1, oil hole 12b1 and sensor positioning hole 12c1, as well as the precision milling of the arc surface on the first protrusion 12a, the end face of the second protrusion 12b and the end face of the third protrusion 12c, in just one clamping operation, thereby greatly improving the machining efficiency.

[0043] Example 2

[0044] This embodiment is basically the same in structure and principle as Embodiment 1, except that: in this embodiment, a bracket is fixedly connected to one end of the base 2 with a guide hole 2d, and the anti-retraction component 6 is a cylinder fixedly connected to the bracket. The piston rod of the cylinder is arranged in the left-right direction, and the small end of the centering clamping block 3 located at the guide hole 2d is arranged opposite to the piston rod of the cylinder. After the two centering clamping blocks 3 are respectively inserted into the two ends of the cylinder body 12, they are pushed out by the piston rod of the cylinder and pressed against the small end of the centering clamping block 3 located at the guide hole 2d. This forms an anti-retraction force on the centering clamping block 3, thereby firmly positioning the cylinder body 12 between the two centering clamping blocks 3.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A jig for drilling a cylinder, comprising a fourth shaft having a bridge plate (1) with a length arranged in a left-right direction, and a base (2) fixed to the top of the bridge plate (1), characterized in that, The front side of the base (2) is provided with a first groove (2a), and two centering clamping blocks (3) opposite in the left-right direction are arranged in the first groove (2a), one of the two centering clamping blocks (3) is fixed on one side wall of the first groove (2a), and the other centering clamping block (3) can move in the left-right direction to form a spacing between the two centering clamping blocks (3) for placing the cylinder body (12), and the opposite ends of the two centering clamping blocks (3) are both provided with annular centering steps (3a), the front side of the bridge plate (1) is provided with a second groove (1a), the second groove (1a) is located directly below the first groove (2a), the distance between the left and right side walls of the second groove (1a) is greater than the minimum spacing between the two centering clamping blocks (3), and the side wall of the first groove (2a) is provided with a block-shaped abutting portion (2b) protruding, the abutting portion (2b) is located on the same side as the fixed centering clamping block (3), the top of the base (2) is connected with a pressing block (4) capable of moving in the vertical direction, the pressing block (4) is located on the same side of the base (2) as the abutting portion (2b), and the pressing block (4) and the abutting portion (2b) are both located on the front side of the center axis of the fixed centering clamping block (3) of the base (2).

2. The jig for cylinder drilling according to claim 1, wherein The centering clamping block (3) is T-shaped, the two ends of the base (2) in the left-right direction are respectively provided with a fixed hole (2c) and a guide hole (2d), the fixed hole (2c) and the guide hole (2d) are oppositely arranged, the centering step (3a) is located at the large end of the centering clamping block (3), the small end of one of the centering clamping blocks (3) is fixedly connected in the fixed hole (2c), and the small end of the other centering clamping block (3) is slidably connected in the guide hole (2d), the clamp further comprises a retreat prevention piece (6), and the retreat prevention piece (6) can abut against the small end of the centering clamping block (3) arranged at the guide hole (2d) in the clamping state.

3. A jig for drilling a cylinder according to claim 2, wherein The one end of the base (2) provided with the guide hole (2d) is hinged with a locking block (7) and is threadedly connected with a limiting rod (8) in the left-right direction, the locking block (7) is strip-shaped in the front-rear direction, the position of the locking block (7) hinged with the base (2) is at the rear end thereof, the front end of the locking block (7) is provided with a matching groove (7a) on the lower side, the retreat prevention piece (6) is rod-shaped and passes through the middle part of the locking block (7) in the left-right direction, the retreat prevention piece (6) is threadedly connected with the locking block (7), the locking block (7) can swing around the hinge point to abut the limiting rod (8) in the matching groove (7a), and when the limiting rod (8) abuts in the matching groove (7a), the retreat prevention piece (6) is opposite to the small end of the centering clamping block (3) arranged at the guide hole (2d).

4. The jig for cylinder drilling according to claim 2, wherein The one end of the base (2) provided with the guide hole (2d) is fixedly connected with a bracket, the retreat prevention piece (6) is a cylinder fixedly connected on the bracket, the piston rod of the cylinder is arranged in the left-right direction, and the small end of the centering clamping block (3) arranged at the guide hole (2d) is oppositely arranged with the piston rod of the cylinder.

5. A jig for drilling a cylinder according to claim 3 or 4, wherein The guiding hole (2d) is internally provided with a shoulder (2d1), the small end of the centering clamping block (3) provided at the guiding hole (2d) is provided with a shaft shoulder (3b), the small end of the centering clamping block (3) penetrates through the shoulder (2d1) and is threadedly connected with an anti-disengagement ring (9), the small end of the centering clamping block (3) is sleeved with a pre-pressing spring (11), and the two ends of the pre-pressing spring (11) are respectively abutted against the shaft shoulder (3b) of the centering clamping block (3) and the shoulder (2d1).

6. A jig for drilling a cylinder according to claim 5, wherein The small end of the centering clamping block (3) provided at the guiding hole (2d) is provided with an insertion slot (3c) on the outer circumferential side, the centering clamping block (3) can be moved to the position that the insertion slot (3c) is located outside the base (2) in the direction away from the fixing hole (2c), and the clamp further comprises an insertion plate capable of being inserted at the insertion slot (3c).

7. The jig for cylinder drilling according to claim 2, wherein The centering clamping block (3) provided at the fixing hole (2c) is provided with a water through hole (3d) penetrating in the left-right direction.

8. A jig for drilling a cylinder according to claim 1 or 2, wherein The top of the base (2) is threadedly connected with a pressing screw (5), and the pressing block (4) is sleeved on the rod portion of the pressing screw (5).

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