Rubber elastic element framework structure for tamping hammer

Abstract

A rubber elastic element framework structure for a tamping hammer comprises a framework body, the framework body is integrally formed by an embedded base plate and an embedded barrel, the embedded barrel is of a barrel-shaped structure formed by sinking a supporting base plate through a center hole, and threads are arranged on the inner wall of the embedded barrel to form a screw connecting groove. The top of the embedded cylinder is a large arc top protruding outwards, the joints between the large arc top of the top of the embedded cylinder and the two side walls of the embedded cylinder are in fillet transition, the action area between the large arc top of the top of the embedded cylinder and a rubber body after rubber hanging is increased, and the groove bottom of a screw connecting groove embedded in the cylinder is provided with a clearance process groove. Under the condition that the number of tapped threads is fixed, the depth of a screw connecting groove is reduced. The rubber elastic element solves the problem that the rubber body is easy to damage after the framework main body is rubberized and the problem of poor bonding strength of the framework and the rubber body, and greatly prolongs the service life of the rubber elastic element.

Description

Technical Field

[0001] The utility model relates to the technical field of supporting elastic elements, and particularly relates to a rubber elastic element skeleton structure for a tamping hammer. Background Art

[0002] At present, for the rubber elastic element used in the tamping hammer, a skeleton is embedded in the upper and lower end faces of the rubber body, and the bolt rod is installed in the thread grooves of the upper and lower end face skeletons to avoid direct connection between the bolt rod and the rubber body, thereby increasing the service life of the rubber body. For example, the rubber spring device for a tamping machine disclosed in the publication number CN208153593U. In order to increase the bonding area between the skeleton and the rubber body and make the spring device more resistant to greater destructive forces and not easily come off, a highly tolerant rubber spring device for a tamping machine disclosed in the publication number CN212004059U is proposed. However, during long-term operation, it is found that there are defects. In the rubber body area where the distance between the upper and lower skeletons is relatively close, that is, the area between the barrel tops of the two embedded cylinders is prone to damage. The reasons are twofold. First, in order to ensure the connection strength between the bolt rod and the thread groove, the number of threads in the thread groove needs to reach a certain amount, which leads to a certain depth of the thread groove, that is, the height of the embedded cylinder is fixed. The distance between the two closest points of the upper and lower skeletons is too close, and the thickness of the rubber body in this area is insufficient. Second, as Figure 5 shown, the pressure of the upper and lower skeletons on the bolt rod is all concentrated in this area. The force in this area is straight up and down and too concentrated. Therefore, the rubber body in this area is particularly prone to damage, resulting in too short a service life of the rubber elastic element formed by this type of skeleton. Content of the Utility Model

[0003] In view of the above problems, the utility model provides a rubber elastic element skeleton structure for a tamping hammer, which reduces the height of the embedded cylinder and increases the external contact area between the embedded cylinder and the rubber after the skeleton is rubber-coated, thereby increasing the stress range of the rubber body in this area.

[0004] To achieve the above object, the following technical solution is adopted: A rubber elastic element skeleton structure for a tamping hammer, including a skeleton body, which is integrally formed by two parts: an embedded chassis and an embedded cylinder. The embedded cylinder is a cylindrical structure formed by the central hole of the support chassis sinking. Threads are provided on the inner wall of the embedded cylinder to form a screw connection groove. The barrel top of the embedded cylinder is a large arc top protruding outward. The connection between the large arc top of the barrel top of the embedded cylinder and the two side walls of the embedded cylinder adopts a fillet transition to increase the contact area with the rubber body after rubber coating. A clearance process groove is designed at the bottom of the screw connection groove in the embedded cylinder to reduce the depth of the screw connection groove under the condition that the number of threads for tapping is fixed.

[0005] Furthermore, the radian value R of the large arc top is 30 - 40 mm.

[0006] Further, the radian value R of the fillet at the connection between the large arc top of the barrel top of the embedded barrel body and the two side walls of the embedded barrel body is 3-5 mm.

[0007] Further, after the support chassis and the embedded barrel body are rubberized, multiple annular grooves are provided on the contact surface with the rubber body.

[0008] Further, the edge of the groove opening of the annular groove is transitioned with a fillet.

[0009] Further, the skeleton body is processed from a stainless steel plate and a carbon steel plate.

[0010] Advantages of the present utility model:

[0011] 1. In this new type, an air clearance process groove is designed at the bottom of the screw connection groove, so that when the number of threads for tapping is fixed, the depth of the screw connection groove is reduced, thereby reducing the total height of the skeleton, and solving the problem of weakness in the rubber body area near the upper and lower skeletons after rubberizing.

[0012] 2. In this new type, the contact between the barrel top part of the embedded barrel body and the rubber body is a circular arc surface contact. The acting area radiated by the circular arc surface is wider, and the pressure received in the concentrated stress area is dissipated, allowing the rubber body outside the area to share the pressure evenly.

[0013] 3. In this new type, the large arc top of the barrel top of the embedded barrel body and the two side walls of the embedded barrel body are transitioned with a fillet, and at the same time, it also avoids hard contact with the rubber body and the situation of cutting the rubber.

[0014] 4. In this new type, multiple annular grooves are provided on the contact surface between the skeleton body and the rubber body, and the edge of the groove opening of the annular groove is transitioned with a fillet, which not only increases the area and adhesion, but also optimizes the stress angle during twisting, shearing or stretching.

[0015] In summary, this new type solves the problems of easy damage of the rubber body after the skeleton body is rubberized and the bonding strength between the skeleton and the rubber body, and greatly extends the service life of the rubber elastic element. Description of the drawings

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a top view of the present utility model;

[0018] Figure 3 is a top view of the present utility model;

[0019] Figure 4 is a schematic diagram of the present utility model applied to form an elastic element;

[0020] Figure 5 is a schematic diagram of a rubber elastic element in the prior art.

[0021] As shown in the figure: 1. Support chassis; 2. Embedded cylinder; 3. Screw connection groove; 4. Clearance process groove; 10. Large arc top; 11. Annular groove; 100. Skeleton body; 200. Rubber body. Specific implementation method

[0022] Embodiment 1

[0023] The following is further described in conjunction with the attached drawings. Figures 1-3 To provide a rubber elastic element skeleton structure for a tamping hammer, the skeleton body 100 includes a support chassis 1 and an embedded cylinder 2. The embedded cylinder is a cylindrical structure formed by the central hole of the support chassis 1 sinking. The inner wall of the embedded cylinder 2 is provided with threads to form a screw connection groove 3. The top of the embedded cylinder 2 is a large arc top 10 protruding outward. The radian value R of the large arc top 10 is 30 - 40 mm. The connection between the large arc top 10 at the top of the embedded cylinder 2 and the two side walls of the embedded cylinder 2 adopts a fillet transition, and the radian value R of the fillet here is 3 - 5 mm. A clearance process groove 4 is designed at the bottom of the screw connection groove 3 in the embedded cylinder 2. Multiple annular grooves 11 are provided on the contact surface between the support chassis 1 and the embedded cylinder 2 after rubber coating and the rubber body 200. The edge of the groove opening of the annular groove 11 adopts a fillet transition.

[0024] The specific process is as follows.

[0025] The skeleton body 100 is cast using stainless steel plates and carbon steel plates. The casting includes a support chassis 1, a protruding cylindrical boss, and a clearance process groove 4 inside the cylindrical boss. After casting, it is polished to remove burrs, and after the surface is cleaned, sandblasting is carried out.

[0026] The annular groove 11 on the outer wall of the support chassis 1 and the protruding cylindrical boss is machined on a lathe. Thread tapping is carried out at the bottom of the protruding cylindrical boss to machine out the screw connection groove 3, so that the protruding cylindrical boss is formed into the embedded cylinder 2. Since the front end of the tap is designed with an inclined surface, the tap cannot machine threads at the bottom of the groove after tapping to the bottom. Therefore, before the skeleton body 100 is cast, a clearance process groove 4 is pre-cast at the bottom of the groove at the pre-tapping position, so that the tap can tap to the bottom of the groove, and the same number of threads are machined. Relatively speaking, the depth of the thread groove with the clearance process groove 4 is shorter.

[0027] The surface of the skeleton body 100 is treated with electro-galvanizing. After galvanizing, the positions of the skeleton body 100 that do not need to be rubber-coated are covered by the tooling, and the rubber-coated positions are then sandblasted for surface roughness treatment to ensure that the surface has sufficient roughness to bond more firmly.

[0028] This new type is as Figure 4As shown in the figure, the top of the cylinder body 2 is designed as a large arc top 10 protruding outwards. The connection between the large arc top 10 of the cylinder body 2 and the two side walls of the embedded cylinder body 2 adopts a rounded corner transition, so that the pressure exerted by the large arc tops 10 of the upper and lower skeleton bodies 100 on the rubber body 200 is divergent. At this time, the stress area is no longer the rubber area between the upper and lower skeleton bodies 100 embedded in the cylinder body 2, but radiates to the area corresponding to the arc surface. And through the design of the clearance process groove 3, the height of the embedded cylinder body 2 is reduced, and the thickness between the upper and lower skeleton bodies 100 embedded in the cylinder body 2 is increased, so that more rubber bears the pressure, greatly reducing the probability of damage to the rubber in this area.

[0029] The present utility model is not limited to this embodiment, and any equivalent concept or change within the technical scope disclosed by the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A rubber elastic element skeleton structure for a tamping hammer, comprising a skeleton body (100), wherein the skeleton body (100) is formed of two parts, an embedded chassis (1) and an embedded cylinder (2), wherein the embedded cylinder (2) is a cylindrical structure formed by supporting the chassis (1) with a center hole sunken, and the inner wall of the embedded cylinder (2) is provided with a threaded screw connection groove (3), characterized in that: The top of the embedded cylinder (2) is a large arc top (10) protruding outward, and the connection between the large arc top (10) of the top of the embedded cylinder (2) and the two side walls of the embedded cylinder (2) adopts a rounded transition, which increases the interaction area with the rubber body (200) after the rubber is applied. The bottom of the screw connecting groove (3) embedded in the cylinder (2) is designed with an air-avoiding process groove, so as to reduce the depth of the screw connecting groove when the number of tapping threads is fixed.

2. The rubber elastic element skeleton structure for a tamping hammer according to claim 1, characterized in that: The curvature value R of the large arc top (10) is 30-40 mm.

3. The rubber elastic element skeleton structure for a tamping hammer according to claim 2, characterized in that: The radius R value of the fillet at the connection between the large arc top (10) of the top of the embedded cylinder (2) and the two side walls of the embedded cylinder (2) is 3-5 mm.

4. The rubber elastic element skeleton structure for a tamping hammer according to claim 3, characterized in that: The contact surfaces of the supporting chassis (1) and the embedded cylinder (2) with the rubber body (200) after being coated with rubber are provided with a plurality of annular grooves (11).

5. The rubber elastic element skeleton structure for a tamping hammer according to claim 4, characterized in that: The notch edge of the annular groove (11) adopts a rounded transition.

6. The rubber elastic element skeleton structure for a tamping hammer according to claim 5, characterized in that: The skeleton body (100) is made of stainless steel plates and carbon steel plates.

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