Tool clamp for drilling oil injection hole in cylinder head of hydraulic cylinder

Abstract

The utility model provides a work fixture for drilling an oil injection hole in a cylinder head of a hydraulic cylinder, and belongs to the technical field of machinery. The problem that the clamping efficiency is low is solved. The clamping device comprises a support and a positioning seat fixed to the top of the support, a positioning groove penetrating through the front side face and the rear side face of the positioning seat is formed in the top of the positioning seat, abutting faces are arranged on the groove walls of the two sides of a groove opening of the positioning groove respectively, mounting seats are fixedly connected to the positions, on the front side and the rear side of the positioning seat, of the top of the support respectively, and clamping blocks are slidably connected into the two mounting seats in the front-back direction. Driving rods are arranged in the two mounting seats in a penetrating mode in the vertical direction, the two driving rods penetrate through the two clamping blocks correspondingly, when the driving rods move up and down, the penetrating clamping blocks can be driven to be close to or away from the other clamping block, the lower ends of the two driving rods penetrate out of the corresponding mounting seats correspondingly, and a synchronous plate is fixedly connected between the lower ends of the two driving rods; the bottom of the support is fixedly connected with an acting cylinder capable of driving the synchronous plate to move up and down. The fixture has the advantages of high clamping efficiency, high clamping speed and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder. Background Technique

[0002] A hydraulic cylinder is a linear motion actuator whose output force is proportional to the effective area of the piston and the pressure difference on both sides. It can convert hydraulic energy into mechanical energy and is widely used in the hydraulic systems of various machines. A hydraulic cylinder basically consists of a cylinder barrel, a cylinder head, a piston, a piston rod, a sealing device, a buffering device and an exhaust device. The end of the piston rod extends out of the cylinder barrel. In practice, the end of the piston rod also needs to be fixedly connected to a cylinder head, also known as a piston rod head, and the cylinder head has an inner hole for a shaft or rod to be driven to pass through. As Figure 8 shown is the cylinder head blank 10, which has a circular block-shaped body 10a and a columnar part 10b protruding from the edge of the body 10a. The columnar part 10b is used for welding and fixing to the end of the piston rod. In practice, an inner hole needs to be machined on the body 10a and an oil-injecting hole 10a1 needs to be machined at a position on the edge of the body 10a opposite to the columnar part 10b. The inner hole is for a shaft or rod to be driven to pass through, and an oil-injecting nozzle needs to be connected to the oil-injecting hole 10a1 during use to facilitate injecting grease through the oil-injecting hole 10a1 into the inner hole to lubricate and rust-proof the driven shaft or rod.

[0003] Before drilling the oil-injecting hole, it is necessary to first position and clamp the cylinder head blank 10. Generally, a positioning seat with a positioning groove is set, and a fixed backing and a movable backing are respectively arranged on both sides of the positioning seat. The movable backing is rotated by manpower to approach the positioning seat by turning a bolt. The cylinder head blank 10 is placed into the positioning groove with the columnar part 10b facing downwards, and one side of the body 10a of the cylinder head blank 10 is abutted against the fixed backing. Then, the bolt is rotated to move the movable backing until the body 10a of the cylinder head blank 10 is tightly clamped. After the oil-injecting hole 10a1 is drilled, the bolt is operated to move the movable backing back to release the cylinder head blank 10. In this way, although firm clamping and fixing can be achieved, the entire clamping operation basically depends on manual completion, so the clamping efficiency is relatively low. Content of the Utility Model

[0004] The purpose of the utility model is to address the above problems existing in the prior art and propose a fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder, which solves the problem of low clamping efficiency.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] A fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder, comprising a bracket and a positioning seat fixed to the top of the bracket. The top of the positioning seat has a downwardly recessed positioning groove that penetrates the front and rear side surfaces of the positioning seat. The two side walls of the positioning groove at the notch have abutting surfaces, and the distance between the two abutting surfaces gradually increases from bottom to top. It is characterized in that mounting seats are respectively fixedly connected to the front and rear sides of the positioning seat on the top of the bracket. The two mounting seats are arranged oppositely. Clamping blocks are slidably connected in the two mounting seats along the front and rear directions. Driving rods are respectively arranged vertically through the two mounting seats. The two driving rods respectively pass through the two clamping blocks, and when the driving rods move up and down, the clamping blocks passed through can be driven to approach or move away from the other clamping block. The lower ends of the two driving rods respectively extend out of the corresponding mounting seats, and a synchronous plate is fixedly connected between the lower ends of the two driving rods. A working cylinder capable of driving the synchronous plate to move up and down is fixedly connected to the bottom of the bracket.

[0007] During use, the cylindrical part of the cylinder head blank is placed downward into the positioning groove of the positioning seat. The cylindrical part will abut against the bottom wall of the positioning groove. At the same time, the outer wall of the body of the cylinder head blank will abut against the two abutting surfaces at the notch of the positioning groove, thereby positioning the cylinder head blank. Then, control the working cylinder to work and drive the two driving rods to move simultaneously through the synchronous plate. The two driving rods drive the two clamping blocks to approach each other and finally clamp and fix the cylinder head blank. After drilling is completed, control the working cylinder to work and drive the two driving rods to reset simultaneously through the synchronous plate. The two driving rods drive the two clamping blocks to move away from each other and loosen the cylinder head blank.

[0008] This fixture drives the synchronous plate to act through the working cylinder, enabling the two driving rods to move synchronously in the vertical direction, and thereby driving the two clamping blocks to automatically approach the positioning seat simultaneously to clamp the cylinder head blank, realizing automatic clamping and improving the clamping efficiency. Moreover, because the two clamping blocks act synchronously, the position of the cylinder head blank in the front and rear directions can be automatically aligned without manual adjustment, further improving the clamping efficiency.

[0009] In the above-mentioned fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder, a guide pin is fixedly connected to the clamping block in the left and right directions. The upper end of the driving rod has a guide groove. The guide groove is arranged in a strip shape in the vertical direction, and the lower end of the guide groove is inclined towards the direction close to the positioning seat relative to the upper end. The guide pin passes through the guide groove.

[0010] Since the guide slots are arranged in a strip shape in the vertical direction and the lower ends of the guide slots are inclined towards the positioning seat relative to the upper ends, and the guide pins pass through the guide slots, when the two driving rods move upward, the two guide slots will move along the corresponding guide pins and apply a thrust to the corresponding clamping blocks through the guide slots, thereby driving the two clamping blocks to approach each other and clamp the cylinder head blank. Similarly, when the two driving rods move downward, the two guide slots will also move along the corresponding guide pins and apply a thrust to the corresponding clamping blocks through the guide slots, thereby driving the two clamping blocks to move away from each other and loosen the cylinder head blank.

[0011] In the above-mentioned fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder, the upper end of the driving rod has a mating groove, the mating groove penetrates the top surface, front side surface and rear side surface of the driving rod, the clamping block has a mating portion located in the mating groove, the depth of the mating groove is greater than the length of the mating portion in the vertical direction, the guide pin is fixedly connected to the mating portion, the number of guide slots is two, and the two guide slots are respectively arranged on the parts of the driving rod on the left and right sides of the mating groove.

[0012] Through the above setting, when the driving rod moves upward or downward, forces are applied to both ends of the guide pin simultaneously, rather than one end of the guide pin being stressed, which greatly increases the durability.

[0013] In the above-mentioned fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder, one side of the upper ends of the two driving rods opposite to each other has a working surface, the lower end of the working surface is inclined towards the positioning seat relative to the upper end, the inclination angle of the lower end of the working surface relative to the upper end is the same as the inclination angle of the lower end of the guide slot relative to the upper end, and both clamping blocks have a mating surface, and the mating surface is parallel to and abuts against the working surface of the corresponding driving rod.

[0014] When the driving rod moves upward and drives the clamping block to move through the cooperation of the mating groove and the mating pin, the working surface of the driving rod will also move along the mating surface and form a thrust on the clamping block. With such a setting, the driving rod applies two forces to the clamping block simultaneously to form clamping, which greatly improves the clamping stability.

[0015] In the above-mentioned fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder, the synchronous plate is provided with a connection hole in the vertical direction, the upper end of the piston of the acting cylinder is fixedly connected with a connection head, the connection hole is arranged in a waist shape in the front-rear direction, the upper end of the connection head is hinged in the connection hole, and there is a gap between the connection head and the inner wall of the connection hole in the front-rear direction.

[0016] The two driving rods are slidably connected to the corresponding mounting bases in the vertical direction. If the connecting head is directly fixedly connected to the synchronous plate, it is required that the machining error is very small. Otherwise, it is easy to occur that the up and down movement of the driving rod is blocked. For this reason, the connecting hole is arranged in a waist shape in the front and rear directions. The upper end of the connecting head is hinged in the connecting hole and the connecting head has a gap with the inner wall of the connecting hole in the front and rear directions. In this way, the connection between the connecting head and the synchronous plate is movable, so as to eliminate the situation that the up and down movement of the two driving rods is blocked due to machining errors.

[0017] In the above-mentioned tooling fixture for drilling and oil injection holes in the cylinder head of the hydraulic cylinder, both clamping blocks include a block body and a flexible pad, and the flexible pad is fixedly connected to the side of the corresponding block body opposite to the other block body.

[0018] The setting of the flexible pad can prevent the clamping block from scratching the cylinder head blank when clamping it.

[0019] In the above-mentioned tooling fixture for drilling and oil injection holes in the cylinder head of the hydraulic cylinder, the number of the positioning seats is several, and the positioning seats are distributed in the left and right directions. The number of the acting cylinders is the same as that of the positioning seats. Mounting seats as described above are fixedly arranged on the front and rear sides of the top of the bracket for each positioning seat, and the clamping blocks and the driving rods as described above are arranged in each mounting seat.

[0020] Such a setting can enable the tooling fixture to clamp and fix multiple cylinder head blanks at one time, improving the production efficiency.

[0021] Compared with the prior art, the tooling fixture drives the synchronous plate to act through the acting cylinder, so that the two driving rods can move synchronously in the vertical direction, and thereby drives the two clamping blocks to automatically approach the positioning seat at the same time to clamp the cylinder head blank, realizing automatic clamping and improving the clamping efficiency.

[0022] In addition, the two clamping blocks act synchronously and can automatically align the position of the cylinder head blank in the front and rear directions, so that no manual adjustment is required, further improving the clamping efficiency. Brief Description of the Drawings

[0023] Figure 1 is a three-dimensional schematic diagram of the tooling fixture for drilling and oil injection holes in the cylinder head of the hydraulic cylinder.

[0024] Figure 2 is a three-dimensional schematic diagram of the tooling fixture for drilling and oil injection holes in the cylinder head of the hydraulic cylinder from another angle.

[0025] Figure 3 is a top view of the tooling fixture for drilling and oil injection holes in the cylinder head of the hydraulic cylinder.

[0026] Figure 4 is Figure 3 the cross-sectional view taken along the A-A direction in

[0027] Figure 5 It is a three-dimensional schematic diagram of the acting cylinder, two driving rods and two clamping blocks.

[0028] Figure 6 It is an exploded schematic diagram between the driving rod and the clamping block.

[0029] Figure 7 It is a three-dimensional schematic diagram of the cylinder head blank clamped on the tooling fixture for drilling and injecting oil holes in the cylinder head of this hydraulic cylinder.

[0030] Figure 8 It is a three-dimensional schematic diagram of the cylinder head blank after drilling the oil injection hole.

[0031] In the figure, 1 is the bracket; 1a is the top plate; 1b is the bottom plate; 1c is the side plate; 2 is the positioning seat; 2a is the positioning groove; 2a1 is the abutting surface; 3 is the mounting seat; 4 is the clamping block; 4a is the block body; 4a1 is the mating part; 4a2 is the mating surface; 4b is the flexible pad; 5 is the driving rod; 5a is the guiding groove; 5b is the mating groove; 5c is the acting surface; 6 is the synchronous plate; 6a is the connecting hole; 7 is the acting cylinder; 8 is the connecting head; 9 is the guiding pin; 10 is the cylinder head blank; 10a is the body; 10a1 is the oil injection hole; 10b is the columnar part. Specific embodiments

[0032] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0033] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown in the figure, a fixture for drilling and oil-injecting holes in the cylinder head of a hydraulic cylinder includes a bracket 1 and a positioning seat 2 fixed to the top of the bracket 1. The top of the positioning seat 2 has a downwardly recessed positioning groove 2a, and the positioning groove 2a penetrates through the front and rear side surfaces of the positioning seat 2. The two side walls of the positioning groove 2a at the notch respectively have abutting surfaces 2a1, and the distance between the two abutting surfaces 2a1 gradually increases from bottom to top. On the top of the bracket 1, mounting seats 3 are respectively fixedly connected to the front and rear sides of the positioning seat 2. The two mounting seats 3 are arranged oppositely, and clamping blocks 4 are slidably connected in the two mounting seats 3 along the front-rear direction. Driving rods 5 are respectively vertically penetrated through the two mounting seats 3. The two driving rods 5 respectively pass through the two clamping blocks 4, and when the driving rods 5 move up and down, the clamping blocks 4 passed through can be driven to approach or move away from the other clamping block 4. The lower ends of the two driving rods 5 respectively extend out of the corresponding mounting seats 3, and a synchronous plate 6 is fixedly connected between the lower ends of the two driving rods 5. A working cylinder 7 capable of driving the synchronous plate 6 to move up and down is fixedly connected to the bottom of the bracket 1. In practice, a connection hole 6a is arranged on the synchronous plate 6 in the vertical direction. The upper end of the piston of the working cylinder 7 is fixedly connected with a connection head 8. The connection hole 6a is arranged in a waist shape in the front-rear direction. The upper end of the connection head 8 is hinged in the connection hole 6a, and there is a gap between the connection head 8 and the inner wall of the connection hole 6a in the front-rear direction. Through such a setting, the connection between the connection head 8 and the synchronous plate 6 is movable, which can ensure that the two driving rods 5 can move synchronously and smoothly in the vertical direction.

[0034] As Figure 4 , Figure 5 and Figure 6As shown in the figure, specifically, a guide pin 9 is fixedly connected to the clamping block 4 in the left-right direction. The upper end of the driving rod 5 has a guide groove 5a. The guide groove 5a is arranged in a strip shape in the vertical direction, and the lower end of the guide groove 5a is inclined towards the positioning seat 2 relative to the upper end. The guide pin 9 passes through the guide groove 5a. The upper end of the driving rod 5 has a mating groove 5b. The mating groove 5b penetrates the top surface, front side surface and rear side surface of the driving rod 5. The clamping block 4 has a mating portion 4a1 located in the mating groove 5b. The depth of the mating groove 5b is greater than the length of the mating portion 4a1 in the vertical direction. The guide pin 9 is fixedly connected to the mating portion 4a1. The number of the guide grooves 5a is two, and the two guide grooves 5a are respectively arranged on the parts of the driving rod 5 on the left and right sides of the mating groove 5b. Further, on one side where the upper ends of the two driving rods 5 face each other, there is an acting surface 5c. The lower end of the acting surface 5c is inclined towards the positioning seat 2 relative to the upper end. The inclination angle of the lower end of the acting surface 5c relative to the upper end is the same as the inclination angle of the lower end of the guide groove 5a relative to the upper end. The two clamping blocks 4 both have a mating surface 4a2. The mating surface 4a2 is parallel to the acting surface 5c of the corresponding driving rod 5 and abuts against it. The two clamping blocks 4 both include a block body 4a and a flexible pad 4b. The flexible pad 4b is fixedly connected to the side of the corresponding block body 4a opposite to the other block body 4a. The flexible pad 4b is specifically made of polyurethane material. The setting of the flexible pad 4b prevents the clamping block 4 from scratching the cylinder head when clamping it.

[0035] During use, the cylindrical part 10b of the cylinder head blank 10 is placed downward into the positioning groove 2a of the positioning seat 2. The cylindrical part 10b will abut against the bottom wall of the positioning groove 2a. At the same time, the outer wall of the body 10a of the cylinder head blank 10 will abut against the two abutting surfaces 2a1 at the notch of the positioning groove 2a, thereby positioning the cylinder head blank 10. Then, control the acting cylinder 7 to work and drive the synchronous plate 6 to move upward. In this way, the two driving rods 5 will move upward synchronously. Since the guide groove 5a is arranged in a strip shape in the vertical direction and the lower end of the guide groove 5a is inclined towards the positioning seat 2 relative to the upper end, and the guide pin 9 passes through the guide groove 5a, when the two driving rods 5 move upward synchronously, the two guide grooves 5a will move along the corresponding guide pins 9 at the same time and apply a thrust to the corresponding clamping blocks 4 through the guide grooves 5a. As a result, the two clamping blocks 4 will approach each other and clamp and fix the cylinder head blank 10. During this process, the acting surface 5c of the driving rod 5 will also move along the mating surface 4a2 and apply a thrust to the clamping block 4. That is to say, the driving rod 5 applies two forces to the clamping block 4 at the same time to form clamping, which greatly improves the clamping stability. After the drilling is completed, control the acting cylinder 7 to work and drive the synchronous plate 6 to move downward. In this way, the two driving rods 5 will move downward synchronously. The two guide grooves 5a will also move along the corresponding guide pins 9 and apply a thrust to the corresponding clamping blocks 4 through the guide grooves 5a, thereby driving the two clamping blocks 4 to move away from each other and loosen the cylinder head blank 10.

[0036] In this embodiment, as Figures 1 - 3 shown, the bracket 1 includes a top plate 1a, a bottom plate 1b, and two side plates 1c fixedly connected between the top plate 1a and the bottom plate 1b and arranged oppositely left and right. The positioning seat 2 and the two mounting seats 3 are both fixed on the top plate 1a, and the lower end of the driving rod 5 passes through the top plate 1a. The acting cylinder 7 is fixed on the bottom plate 1b. Both the top plate 1a and the bottom plate 1b are arranged in a rectangular shape in the left-right direction. The number of the positioning seats 2 is several, and the positioning seats 2 are distributed in the left-right direction. The number of the acting cylinders 7 is the same as that of the positioning seats 2. The mounting seats 3 are fixed on both the front and rear sides of each positioning seat 2 at the top of the bracket 1, and the clamping blocks 4 and the driving rods 5 as described above are provided in each mounting seat 3. Such a setting enables this fixture to clamp and fix a plurality of cylinder head blanks 10 at one time, improving the production efficiency.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A fixture for drilling an oil injection hole in a cylinder head of a hydraulic cylinder, comprising a bracket (1) and a positioning seat (2) fixed to the top of the bracket (1), wherein the top of the positioning seat (2) has a positioning groove (2a) recessed downward and the positioning groove (2a) passes through the front and rear side surfaces of the positioning seat (2), and the two side walls of the positioning groove (2a) at the notch respectively have abutment surfaces (2a1), and the distance between the two abutment surfaces (2a1) gradually increases from bottom to top, characterized in that: The top of the bracket (1) is fixedly connected to mounting seats (3) on both sides of the front and rear of the positioning seat (2), the two mounting seats (3) are arranged opposite to each other, the two mounting seats (3) are slidably connected to clamping blocks (4) in the front and rear directions, the two mounting seats (3) are penetrated with driving rods (5) in the vertical direction, the two driving rods (5) respectively penetrate the two clamping blocks (4) and can drive the clamping blocks (4) passed through to approach or move away from the other clamping block (4) when the driving rods (5) move up and down, the lower ends of the two driving rods (5) respectively penetrate the outside of the mounting seats (3) and a synchronous plate (6) is fixedly connected between the lower ends of the two driving rods (5), and the bottom of the bracket (1) is fixedly connected to an action cylinder (7) capable of driving the synchronous plate (6) to move up and down.

2. The fixture for drilling the oil filling hole of the cylinder head of the hydraulic cylinder according to claim 1 is characterized in that: The clamping block (4) is fixedly connected with a guide pin (9) in the left-right direction. The upper end of the driving rod (5) has a guide groove (5a). The guide groove (5a) is arranged in a strip shape in the vertical direction and the lower end of the guide groove (5a) is inclined relative to the upper end toward the positioning seat (2). The guide pin (9) passes through the guide groove (5a).

3. The fixture for drilling the oil filling hole of the cylinder head of the hydraulic cylinder according to claim 2, characterized in that: The upper end of the driving rod (5) is provided with a matching groove (5b), the matching groove (5b) penetrates the top surface, the front side surface and the rear side surface of the driving rod (5), the clamping block (4) has a matching portion (4a1) located in the matching groove (5b), the depth of the matching groove (5b) is greater than the length of the matching portion (4a1) in the vertical direction, the guide pin (9) is fixedly connected to the matching portion (4a1), the number of the guide grooves (5a) is two, and the two guide grooves (5a) are respectively arranged on the left and right sides of the driving rod (5) on the matching groove (5b).

4. The fixture for drilling the oil injection hole of the cylinder head of the hydraulic cylinder according to claim 3, characterized in that: The upper ends of the two driving rods (5) have an action surface (5c) on one side opposite to the other. The lower end of the action surface (5c) is inclined relative to the upper end toward the positioning seat (2). The inclination angle of the lower end of the action surface (5c) relative to the upper end is the same as the inclination angle of the lower end of the guide groove (5a) relative to the upper end. The two clamping blocks (4) have a matching surface (4a2). The matching surface (4a2) is parallel to and abuts against the action surface (5c) of the corresponding driving rod (5).

5. The jig for drilling the oil filling hole of the cylinder head of the hydraulic cylinder according to claim 1, 2, 3 or 4, characterized in that: The synchronous plate (6) is provided with a connecting hole (6a) in the vertical direction, and a connecting head (8) is fixedly connected to the upper end of the piston of the acting cylinder (7). The connecting hole (6a) is provided in a waist shape in the front-to-back direction, and the upper end of the connecting head (8) is hinged in the connecting hole (6a). There is a gap between the connecting head (8) and the inner wall of the connecting hole (6a) in the front-to-back direction.

6. The fixture for drilling the oil injection hole of the cylinder head of the hydraulic cylinder according to claim 2, 3 or 4, characterized in that: The two clamping blocks (4) each comprise a block body (4a) and a flexible pad (4b), wherein the flexible pad (4b) is fixedly connected to a side of the corresponding block body (4a) opposite to the other block body (4a).

7. The jig for drilling the oil filling hole of the cylinder head of the hydraulic cylinder according to claim 1, characterized in that: The number of the positioning seats (2) is several, and each positioning seat (2) is distributed in the left-right direction. The number of the acting cylinders (7) is the same as the positioning seats (2). The top of the bracket (1) is fixed with the above-mentioned mounting seats (3) on both the front and rear sides of each positioning seat (2), and each mounting seat (3) is provided with the above-mentioned clamping block (4) and the driving rod (5).

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