CN105538235A - Assembly tool of compression spring in cylinder and assembly method thereof - Google Patents

Abstract

The invention provides an assembly tool and an assembly method for a compression spring inside a cylinder body, belonging to the technical field of hydraulic component assembly. The assembly tooling includes a positioning assembly and a pressure head assembly. The pressure head assembly includes a spring pressure head and a connecting screw. The spring pressure head is a hollow cylinder with a split structure, and the upper end of each part of the spring pressure head is a fan-shaped cone surface. The connecting screw passes through the spring pressure head and the spring to be installed, and is screwed into the center cylindrical internal thread hole of the positioning component; by tightening the connection screw, the guide sleeve and the spring pressure head press the compression spring downward, when compressed After the groove of the elastic retaining ring for the hole in the cylinder is exposed, put the elastic retaining ring for the hole in, loosen the connecting screw, and remove the spring pressure head. The purpose of installing the compression spring in the cylinder body can be achieved. The invention has a simple structure and is easy to use. Compared with the existing means for installing compression springs, the invention can effectively reduce the operation difficulty and improve the assembly efficiency and assembly accuracy.

Description

Assembly tooling and assembly method for compression spring inside a cylinder body

technical field

The invention relates to the field of mechanical assembly, in particular to an assembly tool for a compression spring inside a cylinder body and an assembly method thereof, belonging to the technical field of hydraulic component assembly.

Background technique

In the field of mechanical assembly, it is often necessary to assemble a compression spring in a shaft or a hole, and fix it with a shaft or hole elastic ring. Assembling such compression springs is difficult to assemble in place under normal manual operations.

For example, inside the cylinder in a plunger pump, the assembly of the compression spring is very difficult. There are three grooves at the spline of the cylinder body, which are evenly distributed around the circumference, and are used to place three thimbles. When the thimbles withstand the front parts, recoil is required. The compression spring is set inside the cylinder to provide recoil. One end of the compression spring needs to press the circular washer, and the circular washer is used for the three thimbles evenly distributed in the spline opening groove in the cylinder body, and the other end needs to be blocked by the circlip for the hole.

For the operation of assembling the compression spring and fixing the compression spring in the cylinder body with a hole and an elastic retaining ring, it is difficult to assemble it in place by conventional assembly. If the operation is performed with brute force, the position of the thimble will be biased due to the rough assembly process. shift, the precision is not enough and the work efficiency is low. The relevant assembly method of the compression spring in this type of cylinder has not been announced before. Tests have proved that if the spring is squeezed into the cylinder with an assembly tool, it is difficult to disassemble the pressure head after the installation is completed.

Therefore, there is an urgent need to design an assembly tool for the compression spring inside the cylinder, so that the assembly process can be easily realized, the assembly can be precise and convenient for personnel to install, and the pressure head parts can be easily disassembled to improve work efficiency.

Contents of the invention

Aiming at the deficiencies of the existing assembly technology, the present invention provides an assembly tool and an assembly method for the compression spring inside the cylinder, which can save manpower, improve the assembly accuracy and facilitate the disassembly of the pressure head parts.

The technical solution of the present invention is as follows: an assembly tool for compressing springs inside a cylinder, including a positioning assembly and a pressure head assembly, the pressure head assembly includes a spring pressure head and a connecting screw, and the spring pressure head is a hollow structure of a split type A cylinder, the upper end of each part of the spring pressure head is a fan-shaped cone, and the edge exceeds the outer diameter of the hollow cylinder.

The technical solution of the present invention also includes: the spring pressure head is composed of 2 to 4 vertical split structures with the same size, and a recessed platform is provided on the inner side of the upper end of each split structure. When the spring indenter is set to be composed of 2 to 4 vertical split structures with the same size, it is more convenient to operate. If there are too many split structures of the spring indenter, it will be difficult to assemble on the one hand, and will cause problems in operation. Unnecessary repetition, the size of the split structure of the spring pressure head decreases correspondingly as the number increases. The concave platform provided on the upper end of the spring pressure head is used to place the washer or the guide sleeve, which facilitates the use of connecting screws and makes the structure of the assembly tool more reasonable.

The technical solution of the present invention also includes: the spring pressure head is preferably composed of two vertical split structures with the same size. When the spring pressure head is composed of two split structures with the same size, the use of the spring pressure head is most convenient.

The technical solution of the present invention also includes: each split structure of the spring press head is evenly placed on the inner ring side of the compression spring to be assembled with the central axis of the hollow cylinder as the center, and the adjacent spring press head split structures Leave a gap in between. The split structures of the spring indenters are evenly distributed so that the compression springs are evenly stressed, which is convenient for assembly, and there are gaps between each other, making it easier and feasible to take out the spring indenters.

The technical solution of the present invention also includes: the positioning assembly includes a base and a positioning seat, and the positioning seat is fixed on the base by fasteners. When there is no operation platform to implement the compression spring assembly tool inside the cylinder, the base can play a good role in supporting and stabilizing.

The technical solution of the present invention also includes: an internal threaded hole is arranged in the central column of the positioning seat. The internally threaded hole is used for fastening the connecting screw, which can make the pressure head part more stable when pressing the compression spring downward, and reduce operation errors.

The technical solution of the present invention also includes: the outer diameter of the central column of the positioning seat is adapted to the size of the notch formed by the built-in thimble in the cylinder, the diameter of the outer ring of the positioning seat is adapted to the size of the outer profile of the cylinder, And the height of the positioning seat is adapted to the height of the bottom of the cylinder body. The structure of the positioning seat enables the cylinder body to remain stable during operation, thereby achieving a good positioning effect.

The technical solution of the present invention also includes: the base and the positioning seat are integrally formed. When there is an operation platform suitable for the assembly tool, the positioning seat and the base are integrally formed, which reduces the manufacturing process and simplifies the operation steps.

The technical solution of the present invention also includes: the connecting screw passes through the compression spring and the spring pressure head, and is screwed into the internal threaded hole of the central column of the positioning seat. With the help of the structure of the connecting screw, when it moves downwards, the spring pressure head also moves downwards to squeeze the compression spring, which is more convenient and labor-saving than the existing manual force to squeeze the compression spring into the cylinder body.

The technical solution of the present invention also includes: the indenter part includes a guide sleeve, and the guide sleeve is placed along the inner wall of the spring indenter so that its top end is against the concave platform formed by the spring indenter. The guide sleeve has a wide range of application and is easy to obtain materials. The use of the guide sleeve can make the direction of the connecting screw less likely to deviate.

The technical solution of the present invention also includes: an assembly method of the compression spring inside the cylinder, characterized in that: the steps of the assembly method are:

1) Fix the three thimbles with elastic fixing rings in the thimble groove of the spline port in the cylinder body, then put the circular gasket in the cylinder body, and press it on the top of the three thimbles, and adjust the circular gasket Cooperate with the three thimbles, and then put the compression spring in the cylinder, so that the lower end of the compression spring contacts the circular washer to form a preliminary combination;

2) Press the compression spring by hand, put the initial combination upside down on the positioning seat, so that the spline groove of the cylinder body can be inserted into the center column of the positioning seat;

3) Place each split structure of the spring indenter evenly around the central axis of the hollow cylinder on the inner ring edge of the compression spring to be assembled, and leave a gap between the adjacent spring indenter split structures;

4) Pass the connecting screw through the spring pressure head and the compression spring, and screw it into the inner threaded hole of the center column of the positioning seat;

5) After checking that the thimble and the compression spring are in place, tighten the connecting screw with a simple wrench, and the compression spring is then pressed into the cylinder body. After the groove of the elastic retaining ring for the hole on the inner side of the cylinder body is exposed, stop screwing. Tight, place the hole with a circlip into the groove with snap ring pliers;

6) Use a simple wrench to loosen the connecting screw in the opposite direction, and remove the connecting screw;

7) Lightly tap the spring pressure head with a screwdriver to remove it, and then take out the elastic fixing ring at the bottom of the cylinder to achieve the purpose of installing the compression spring in the cylinder.

In the step 3 of the assembly method of the technical solution of the present invention, after the spring pressure head is placed, the guide sleeve can be placed along the inner wall of the spring pressure head, so that the top end is against the concave platform formed by the spring pressure head. In step 4, the connecting screw passes through the spring pressure head and the compression spring while passing through the guide sleeve. In step 6, the guide sleeve is removed after the connecting screw is removed.

The beneficial effect of the present invention is that: compared with the disadvantages of laborious operation, difficult disassembly and low flexibility when using the spring press head with an integral structure, when the spring press head is set as a split structure, after the compression spring is installed, the spring presses The heads can be knocked out one by one in turn, which reduces the difficulty of operation. The design of the fan-shaped conical surface with a certain inclination on the upper end of the spring indenter is more convenient to disassemble than the indenter with a flat upper end. It can be removed by tapping with a screwdriver, which solves the problem of compressing the spring in the existing assembly process. After entering the cylinder body, the pressure head parts are not easy to disassemble. This kind of assembly tool for the compression spring inside the cylinder has a simple structure and is easy to use, and it is more accurate than the operation method of installing the compression spring by brute force, which reduces the error caused by the thimble offset caused by rough installation, and can effectively Reduce the difficulty of operation, improve assembly efficiency and assembly accuracy.

Description of drawings

In order to make the purpose, technical solution and advantages of the compression spring assembly tool of the present invention clearer, the present invention will be further described in detail in conjunction with specific drawings and specific assembly methods as follows.

Fig. 1 is the sectional structural schematic diagram of the assembly tooling of compression spring inside the cylinder body;

Fig. 2 is a schematic diagram of the structure of the positioning seat;

Fig. 3 is a schematic cross-sectional structural view of the cylinder body before installing the pressure head part;

Fig. 4 is a schematic diagram of the split structure of the spring pressure head;

Fig. 5 is the structural representation of guide sleeve;

Fig. 6 is a schematic diagram of the structure after the circlip is used for the installation hole;

Fig. 7 is a structural schematic diagram after the cylinder block is installed;

Fig. 8 is a structural schematic diagram of an integrally formed positioning seat;

Fig. 9 is a schematic cross-sectional structural view of the assembly tooling of the compression spring inside the cylinder when the guide sleeve is not used;

Fig. 10 is a schematic diagram of the installation of a spring pressure head using a vertical three-part structure;

Figure 11 is a schematic diagram of the original shape of the cylinder.

Among them: 1. cylinder body, 2. guide sleeve, 3. compression spring, 4. spring pressure head, 5. base, 6. positioning seat, 7. connecting screw, 8. thimble, 9. circular washer, 10. elasticity Fixed ring, 11, circlip for hole, 12, fastening screw, 13, one-piece positioning seat, 14, washer, 15, center post of positioning seat, 16, recessed platform.

detailed description

The present invention will be further described below through the embodiments and in conjunction with the accompanying drawings.

An assembly tool for compression springs inside a cylinder, including a positioning assembly and a pressure head assembly. The pressure head assembly includes a spring pressure head 4 and a connecting screw 7. The spring pressure head 4 is a hollow cylinder with a split structure, and each part The upper ends of the spring pressure head 4 are fan-shaped cones, and the edges exceed the outer diameter of the hollow cylinder.

The positioning assembly of the assembly tool includes a base 5 and a positioning seat 6, the positioning seat 6 is fixed on the base 5 by fasteners, and an internal thread hole is provided in the central column 15 of the positioning seat. As shown in FIG. 2 , the bottom of the positioning seat 6 is provided with four internally threaded holes corresponding to the base 5 , and the positioning seat 6 is vertically fixed on the base 5 with four fastening screws 12 .

Fix the three thimbles 8 with elastic fixing rings 10 in the three thimble slots uniformly distributed in the spline mouth of the cylinder body 1 as shown in Figure 11, and put the circular gasket 9 in the cylinder body 1 , and press on the top of three thimbles 8. Adjust the cooperation of the circular washer 9 and the three thimbles 8, put the compression spring 3 in the cylinder body 1, make the lower end of the compression spring 3 contact the circular washer 9, and form a preliminary combination.

Press the compression spring 3 by hand, put the initial combination upside down on the positioning seat 6, and insert the spline notch of the cylinder body 1 into the center column 15 of the positioning seat. During the assembly process, ensure that the three thimbles 8 and the elastic fixing ring 10 are not displaced. . Figure 3.

Place the two split structures of the spring pressure head 4 symmetrically on the inner ring side of the compression spring 3 to be assembled, and then put the guide sleeve 2 as shown in Figure 5 along the inner wall of the spring pressure head 4, so that the guide sleeve 2 The top end of the sleeve 2 abuts against the recess formed by the spring head 4, and then the connecting screw 7 passes through the guide sleeve 2 and the compression spring 3, and is screwed into the internal threaded hole of the central column 15 of the positioning seat.

After checking that the thimble 8 and the compression spring 3 are in place, tighten the connecting screw 7 with a simple wrench, and the compression spring 3 is then pressed into the cylinder body 1, until it is screwed to expose the hole at the rear end of the cylinder body 1, use the elastic retaining ring groove Finally, stop tightening, and place the circlip 11 for the hole into the groove with a circlip pliers, at this time the compression spring 3 has been installed into the cylinder, as shown in Figure 6.

Rotate the connecting screw 7 in the opposite direction with a simple wrench, and remove the connecting screw 7 and the guide sleeve 2. Since the upper end of the spring pressure head 4 is a fan-shaped conical surface, the two pieces of spring pressure head 4 can be tapped off with a screwdriver, and then the elastic fixing ring 10 at the bottom of the cylinder body is taken out, and the operation is completed to achieve installation in the cylinder body 1. The purpose of compression spring 2 is shown in Figure 7.

The cross-sectional structure of the assembly tooling for the compression spring inside the entire cylinder is shown in Figure 1.

On this basis, the present invention also has a second embodiment, the base 5 and the positioning seat 6 described in the technical solution of the present invention are integrally formed. The integrally formed positioning seat 13 is equivalent to removing the base 5 and adding a flange to the bottom of the original positioning seat 6 to increase the stability during use. When there is an operation table suitable for the assembly tool, the positioning seat and the base are integrally formed, which reduces the manufacturing process and simplifies the operation steps while being stable, as shown in Figure 8.

In addition, in the technical solution of this invention, there is also a third embodiment. In order to save material and reduce the manufacturing process, the guide sleeve 2 can also be removed, the spring plunger 4 can be replaced with a spring plunger 4 with a small inner diameter, and a washer 14 can be placed on the spring plunger 4, as shown in Figure 9 . If the inner diameter of the spring pressure head 4 is too small, the pressure head should not be removed, if it is too large, it will be difficult to resist the connecting screw 7, and it will not be easy to cooperate during the assembly process. According to experimental measurements, when the guide sleeve 2 is not used, the When the inner diameter of the spring head 4 is set to be 2-4mm larger than the outer diameter of the connecting screw 7, it can satisfy the use of the assembly tool.

In addition, in the technical solution of the present invention, the spring pressing head can be in a 2-4 split structure, as shown in FIG. 10 , it is a vertical three-part structure of the spring pressing head.

The split structure or the split structure of the spring indenter in the present invention is the constituent structure of the split spring indenter, which is a part of the spring indenter, and is a vertical split structure.

The fan-shaped conical surface in the present invention refers to a fan-shaped surface on the horizontal plane, but a slope with a certain inclination on the vertical plane, as shown in FIG. 4 .

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in this within the scope of protection of the invention.

Claims (10)

1. An assembly tool for the compression spring inside the cylinder, including a positioning assembly and a pressure head assembly, characterized in that: the pressure head assembly includes a spring pressure head (4) and a connecting screw (7), and the spring pressure head ( 4) It is a hollow cylinder with a split structure, and the upper end of each part of the spring pressure head (4) is a fan-shaped cone surface, and the edge of the fan-shaped cone surface exceeds the outer diameter of the hollow cylinder. 2. The assembly tool for the compression spring inside the cylinder according to claim 1, characterized in that: the spring pressure head (4) is composed of 2 to 4 vertical split structures with the same size, and each Concave platforms (16) are provided on the insides of the upper ends of the split structures. 3. The assembly tool for the compression spring inside the cylinder according to claim 2, characterized in that: each split structure of the spring pressure head (4) is evenly placed on the central axis of the hollow cylinder On the edge of the inner ring of the assembled compression spring (3), gaps are left between the split structures of adjacent spring pressure heads (4). 4. The assembly tool for the compression spring inside the cylinder according to claim 3, characterized in that: the positioning assembly includes a base (5) and a positioning seat (6), and the positioning seat (6) is fastened The component is fixed on the base (5), and the center column (15) of the positioning seat is provided with an internal threaded hole. 5. The assembly tool for the compression spring inside the cylinder according to claim 4, characterized in that: the outer diameter of the central column (15) of the positioning seat is formed by the built-in thimble (8) in the cylinder (1). The notch size of the positioning seat (6) is adapted to the outer diameter of the cylinder (1), and the height of the positioning seat (6) is compatible with the height of the bottom of the cylinder (1). adapt. 6. The assembly tool for the compression spring inside the cylinder according to claim 5, characterized in that: the base (5) and the positioning seat (6) are integrally formed. 7. The assembly method of the compression spring inside the cylinder according to claim 6, characterized in that: the connecting screw (7) passes through the compression spring (3) and the spring pressure head (4), and is screwed In the inner threaded hole of the central column (15) of the positioning seat. 8. The assembly tool for the compression spring inside the cylinder according to any one of claims 2 to 7, characterized in that: the pressure head part also includes a guide sleeve (2), and the guide sleeve (2) is attached to The inner wall of the spring pressure head (4), the top of the guide sleeve (2) is against the concave platform (16) at the upper end of the spring pressure head (4). 9. An assembly method of a compression spring inside a cylinder, characterized in that: the steps of the assembly method are: 1) Fix the three thimbles (8) with elastic fixing rings (10) in the thimble slots of the spline opening in the cylinder (1), and then put the circular gasket (9) in the cylinder (1) , and press on the top of the three thimbles (8), adjust the fit between the circular washer (9) and the three thimbles (8), and then put the compression spring (3) in the cylinder (1) so that the compression spring The lower end of (3) is in contact with the circular washer (9) to form a preliminary combination; 2) Press the compression spring (3) by hand, and place the initial combination upside down on the positioning seat (6), so that the spline notch of the cylinder body (1) fits into the center column of the positioning seat (15); 3) Place each split structure of the spring indenter (4) evenly on the inner ring side of the compression spring (3) to be assembled centered on the central axis of the hollow cylinder, and the adjacent spring indenters (4) are separately There are gaps between the body structures; 4) Pass the connecting screw (7) through the spring pressure head (4) and the compression spring (3), and screw it into the inner threaded hole of the center column (15) of the positioning seat; 5) After checking that the thimble (8) and the compression spring (3) are in place, tighten the connecting screw (7) with a simple wrench, and the compression spring (3) is then pressed into the cylinder (1), until it is exposed After the hole inside the cylinder body (1) is grooved with the circlip, stop tightening, and use the circlip pliers to place the hole with the circlip (11) into the groove; 6) Use a simple wrench to loosen the connecting screw (7) in the opposite direction, and remove the connecting screw (7); 7) Tap the spring pressure head (4) lightly with a screwdriver to remove it, and then take out the elastic fixing ring (10) at the bottom of the cylinder body to achieve the purpose of installing the compression spring (2) in the cylinder body (1). 10. The method for assembling the compression spring inside the cylinder according to claim 9, characterized in that: in the step 3, after the spring pressure head (4) is placed, the guide sleeve (2) is placed along the spring Insert the inner wall of the pressure head (4) so that its top end is against the recess (16) formed by the spring pressure head (4). In step 4, the connecting screw (7) passes through the spring pressure head (4) and The spring (3) also passes through the guide sleeve (2) at the same time, and in the step 6, the guide sleeve (2) is subsequently removed after the connecting screw (7) is removed.