Cylinder body of hydraulic support jack

Abstract

The utility model relates to the technical field of coal mining, in particular to a cylinder body of a hydraulic support jack. The ashtray body comprises an overshoe, an ashtray bottom and an ashtray pipe, the ashtray bottom and the ashtray pipe are integrally formed to form an ashtray body, the overshoe is connected with a lug fixed to the ashtray body through a connecting piece, or the overshoe and the ashtray body are integrally formed, and therefore the bottom of the ashtray body is fixedly sleeved with the overshoe. Wherein the cylinder bottom and the cylinder pipe are integrally formed and manufactured and are not connected in a welding mode any more, and the problems of welding defects, deformation and the like caused by welding of the cylinder pipe and the cylinder bottom in the production process of a cylinder body of an existing hydraulic support jack are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal mining, especially relates to a cylinder body of hydraulic support jack. BACKGROUND

[0002] The hydraulic support is an important component of the fully mechanized mining equipment, and mainly functions to support the roof of the mining field, maintain the safe operation space and push the mining and transportation equipment in the working face. The jack in the hydraulic support is a key component for completing the pushing, support and frame adjustment functions, and therefore the strength and stability of the cylinder body of the hydraulic support jack become particularly important.

[0003] In the prior art, the cylinder body of the hydraulic support jack is formed by splicing and welding the cylinder pipe and the cylinder bottom, and various required parts are welded on the outer circle. In the actual production process, defects such as blowhole, slag inclusion, incomplete fusion, crack and undercutting are prone to occur in the welding, which reduces the actual cross-sectional area of the weld, reduces the load-bearing capacity of the welded part, and is prone to defects such as stress concentration and reduced fatigue strength. In addition, due to the welding heat input, the roundness and local dimensional stress deformation of the inner hole are out of tolerance, and the base material in the heat-affected zone of the weld is hardened, which is prone to brittle fracture. After the cylinder body is welded, especially for the exported products, in order to detect the quality of the weld, a knife detection and non-destructive testing are required at the weld. If defects are found, the traditional method for solving the welding defects is to remove the weld layer by layer by a lathe until the position of the welding defect is found, and then the welding is performed again. Sometimes, even after re-welding, the internal defects of the weld are still detected, at which time the weld needs to be removed layer by layer again, the defects need to be found, and the welding needs to be performed again until the flaw detection is qualified. Due to repeated welding, the mechanical properties of the base material, the weld and the heat-affected zone are greatly different, which greatly reduces the pressure-bearing capacity of the cylinder body.

[0004] Therefore, the traditional cylinder body of the hydraulic support jack has the problems of poor product quality, complex process, high cost and long manufacturing cycle caused by welding defects. UTILITY MODEL CONTENTS

[0005] (I) Technical problem to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a cylinder body of a hydraulic support jack, which solves the problems of welding defects and deformation caused by the welding of the cylinder pipe and the cylinder bottom in the production process of the existing hydraulic support jack cylinder body.

[0007] (II) Technical scheme

[0008] In order to achieve the above-mentioned purpose, the utility model provides a cylinder body of a hydraulic support jack, which comprises a sleeve shoe, a cylinder bottom and a cylinder pipe. The cylinder bottom and the cylinder pipe are integrally formed to form a cylinder body main body, and the sleeve shoe is fixedly sleeved at the bottom of the cylinder body main body.

[0009] Optionally, the cylinder further comprises an ear seat and a connecting piece, the ear seat is fixedly sleeved on the cylinder body and is close to the cylinder port of the cylinder body relative to the sleeve shoe, and the sleeve shoe is connected with the ear seat through the connecting piece.

[0010] Optionally, the connecting piece comprises a bolt and a nut, the ear seat is provided with a lug with a hole on both sides, the sleeve shoe is provided with a countersunk hole, and the bolt is screwed with the nut through the countersunk hole and the hole on the lug in sequence; the cylinder bottom and the cylinder pipe are integrally formed by the whole forging forming technology of positive extrusion and reverse extrusion; and the ear seat is welded on the cylinder body.

[0011] Optionally, the sleeve shoe is provided with a groove on a side facing the cylinder body, and the cylinder body is accommodated in the groove.

[0012] Optionally, the sleeve shoe, the cylinder bottom and the cylinder pipe are integrally formed.

[0013] Optionally, the sleeve shoe, the cylinder bottom and the cylinder pipe are integrally formed by the whole forging forming technology of positive extrusion and reverse extrusion.

[0014] Optionally, a circular truncated cone is formed on a side of the sleeve shoe away from the cylinder body and extending away from the cylinder body, and the circular truncated cone is arranged at a position corresponding to the cylinder bottom.

[0015] Optionally, a conical boss is formed on the inner bottom wall of the cylinder body and protrudes inwardly, the inner bottom wall of the cylinder body is rounded at a connecting position with the inner peripheral wall, and an annular recess is formed in the region of the inner bottom wall between the conical boss and the inner peripheral wall; the inner peripheral wall region of the cylinder port of the cylinder body is formed with an inner stop and an inner thread, and the inner stop and the inner thread are arranged in a direction from the inner bottom wall to the cylinder port.

[0016] Optionally, the sleeve shoe, the cylinder bottom and the cylinder pipe are made of any one of 27SiMn, 30CrMnSi and 30CrMo.

[0017] Optionally, the inner bottom wall and the inner peripheral wall in the cylinder body are both provided with a corrosion-resistant layer, and the corrosion-resistant layer is preferably a copper alloy corrosion-resistant layer.

[0018] (Three) beneficial effects

[0019] The cylinder of the hydraulic support jack of the utility model is integrally formed by the cylinder bottom and the cylinder pipe, and welding is not needed, so that the defects of pores, slag inclusion and incomplete fusion caused by welding and the welding deformation problem can be effectively avoided, the difference in mechanical properties of the base material, the weld and the HAZ (heat affected zone) caused by welding can also be effectively avoided, the cylinder has stronger pressure-bearing capacity, the manufacturing period is shorter, and the quality and production efficiency of the product are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1It is half section schematic view of cylinder body embodiment 1 of hydraulic support jack of the utility model.

[0021] Figure 2 For Figure 1 It is bottom view of cylinder body after ear seat is welded in cylinder body of as shown in the drawing.

[0022] Figure 3 For Figure 1 It is schematic view of cylinder body and piston rod cooperation of as shown in the drawing.

[0023] Figure 4 It is cross section schematic view of cylinder body embodiment 2 of hydraulic support jack of the utility model.

[0024]

Explanation of reference signs

[0025] 1: shoes;11: recess;12: circular table;

[0026] 2: cylinder bottom;

[0027] 3: cylinder pipe;

[0028] 4: ear seat;

[0029] 5: connecting piece;51: bolt;52: nut;

[0030] 6: cylinder body;61: annular nest;62: inner stop;63: internal thread;

[0031] 7: guide sleeve;

[0032] 8: piston rod. Specific implementation

[0033] In order to better explain the utility model, so as to facilitate understanding, the following will be combined with the drawings, through specific implementation, the utility model is described in detail, wherein, the "upper", "lower", "left", "right" and other orientation terms mentioned in this paper are with the orientation of the drawing as reference. Figure 1

[0034] The cylinder body of the hydraulic support jack provided in the embodiment of the utility model is integrally formed to manufacture the cylinder bottom and the cylinder pipe, and no longer uses the traditional welding mode for connection, compared with the prior art, it can effectively avoid a series of defects caused by welding, has stronger pressure-bearing capacity, and has shorter manufacturing period, so that the quality and production efficiency of the product can be greatly improved.

[0035] ​For better understanding of the above technical solutions, the following will refer to the drawings to describe the exemplary embodiments of the present application in more detail. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present application and to convey the complete scope of the present application to those skilled in the art.

[0036] Embodiment 1:

[0037] Referring to Figure 1 The cylinder of the hydraulic support jack provided in the embodiment comprises a sleeve shoe 1, a cylinder bottom 2, a cylinder pipe 3, an ear seat 4 and a connecting piece 5, wherein the cylinder bottom 2 and the cylinder pipe 3 are integrally formed to form a cylinder main body 6, and the cylinder main body 6 is a rotary body, which is the same as the prior art. The integrally formed manufacturing method preferably adopts the whole forging forming technology of positive extrusion + reverse extrusion for integrally forming manufacturing. Of course, any manufacturing method that can integrally form the cylinder main body 6 of the cylinder bottom 2 and the cylinder pipe 3, such as casting or machining, is within the protection scope of the present application.

[0038] The cylinder bottom 2 and the cylinder pipe 3 are integrally formed, and are no longer connected by the traditional welding method. This can effectively avoid defects such as pores, slag inclusion and incomplete fusion caused by welding and welding deformation problems, and can also effectively avoid the problem of differences in mechanical properties of the base metal, weld and HAZ (heat affected zone) caused by welding. The overall mechanical property index is better than that of the welding process, and the pressure-bearing capacity is stronger, can withstand higher pressure load, the process flow is simple, and the repair problem caused by welding defects is avoided, the manufacturing cycle is shorter, the product quality and production efficiency can be improved, and the machining quality and service life of the hydraulic support jack cylinder of the fully mechanized coal mining face can be further improved.

[0039] Meanwhile, the sleeve shoe 1 is fixedly sleeved at the bottom of the cylinder main body 6, and a groove 11 is formed on the side of the sleeve shoe 1 facing the cylinder main body 6. The bottom of the cylinder main body 6 is accommodated in the groove 11, and the other part of the cylinder main body 6 extends out of the groove 11 in a direction away from the sleeve shoe 1. The side of the sleeve shoe 1 away from the cylinder main body 6 extends in a direction away from the cylinder main body 6 to form a circular truncated cone 12. The circular truncated cone 12 is arranged in position corresponding to the groove 11. The sleeve shoe 1 is in the shape of a disc with cantilevers on both sides.

[0040] The ear seat 4 is fixedly sleeved on the cylinder body 6 at a position adjacent to the sleeve shoe 1 and close to the cylinder port of the cylinder body 6, a step is arranged on the outer periphery of the cylinder body 6, the ear seat 4 abuts on the step to limit the movement of the ear seat 4 towards the cylinder port of the cylinder body 6, thereby providing a limit for the welding of the ear seat 4 on the cylinder body 6. After the ear seat 4 is welded on the cylinder body 6, the sleeve shoe 1 is connected with the ear seat 4 through the connecting piece 5. Specifically, the ear seat 4 is formed with lugs with holes on both sides, the sleeve shoe 1 is provided with counterbores (which can also be round holes), the counterbores are arranged corresponding to the holes on the lugs, and the bolt 51 is sequentially threaded through the counterbores and the holes on the lugs and screwed with the nut 52. As shown in Figure 2 , the ear seat 4 is annular structure with lugs on both sides.

[0041] Therefore, the sleeve shoe 1 is indirectly fixedly sleeved on the cylinder body 6 through the welding of the ear seat 4 on the cylinder body 6 and the connection of the ear seat 4 with the sleeve shoe 1 through the connecting piece. The utility model is not limited to the above specific mode, for example, a pin or any connecting piece that can be thought of by those skilled in the art can be used to replace the bolt to connect the ear seat 4 and the sleeve shoe 1; the fixing mode of the ear seat 4 on the cylinder body 6 can also be any form that can be thought of by those skilled in the art, including but not limited to press fitting, welding and connection through fasteners.

[0042] The cylinder shown in the embodiment is characterized in that a conical boss is formed on the inner bottom wall of the cylinder body 6 at the center, the connection position of the inner bottom wall and the inner peripheral wall of the cylinder body is rounded, the inner bottom wall region between the conical boss and the inner peripheral wall forms an annular recess 61, the unstable dimension can be controlled near the annular recess 61 formed by the middle protrusion, the tool engagement position of the blind hole turning and the blind hole honing is not at the sealing band, thereby improving the sealing performance and service life of the jack, and when the jack starts to work, as shown in Figure 3 , the annular recess 61 can increase the contact area of the liquid with the end surface of the piston rod 8, so that the piston rod 8 is better pushed out.

[0043] As shown in Figure 1 and Figure 3 , the inner peripheral wall region of the cylinder port of the cylinder body 6 is formed with an inner stop 62 and an inner thread 63, the inner stop 62 and the inner thread 63 are arranged in the direction from the inner bottom wall to the cylinder port, and are used for positioning and installing the guide sleeve 7.

[0044] The material of the sleeve shoe, the cylinder bottom and the cylinder pipe shown in the embodiment includes but is not limited to any one of 27SiMn, 30CrMnSi and 30CrMo, and the lug seat can be made of the same material as above or other materials. The person skilled in the art can select the required material according to the actual production requirement, and when the two contact parts are made of different materials, anticorrosion treatment should be done to avoid electrochemical corrosion. In this case, when the overall yield strength of the cylinder body needs to reach 600MPa, 27SiMn can be selected, and when the overall yield strength of the cylinder body needs to reach 700MPa, 30CrMnSi or 30CrMo can be selected.

[0045] The inner bottom wall and the inner peripheral wall in the cylinder body are further provided with a copper alloy anticorrosion layer, which can be formed by electroplating tin bronze or cladding copper alloy, so as to ensure the thickness requirement of the inner hole anticorrosion layer and make the inner hole meet the H9 level tolerance and the roughness Ra0.4 requirement (the inner hole is the hole structure formed by the inner bottom wall and the inner peripheral wall in the cylinder body 6).

[0046] Embodiment 2

[0047] Referring to Figure 4 The difference between the embodiment and the embodiment 1 is that the sleeve shoe 1 is also integrally formed with the cylinder body 6, specifically, the sleeve shoe 1 and the cylinder body 6 are integrally formed by the overall forging forming technology of forward extrusion and reverse extrusion, that is, the sleeve shoe 1, the cylinder bottom 2 and the cylinder pipe 3 are integrally formed by the overall forging forming technology of forward extrusion and reverse extrusion. Therefore, the lug seat 4 and the connecting piece 5 are no longer needed for connection.

[0048] In the embodiment, the sleeve shoe, the cylinder bottom and the cylinder pipe are made of any one of 27SiMn, 30CrMnSi and 30CrMo, but the three have the same material.

[0049] The embodiment shows the cylinder body, which cancels the original lug seat 4 and the connecting piece 5 and integrally forms the sleeve shoe 1, the cylinder bottom 2 and the cylinder pipe 3, so that the whole cylinder body structure is simpler and more stable.

[0050] The embodiment about the inner hole of the cylinder body 6 and the selection of the material are the same as the embodiment 1, which will not be repeated here (the inner hole is the hole structure formed by the inner bottom wall and the inner peripheral wall in the cylinder body 6).

[0051] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect;Can be two element inside communication or two element mutual action relation.For ordinary skilled person in the art, can understand the specific meaning of above-mentioned terms in the utility model according to specific circumstances.

[0052] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature, which can be directly above or obliquely above the first feature, or simply means that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature, which can be directly below or obliquely below the first feature, or simply means that the first feature is lower than the second feature in horizontal height.

[0053] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0054] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present utility model. The ordinary skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present utility model.

Claims

1.A cylinder body of a hydraulic support jack, characterized in that: it comprises a sleeve shoe (1), a cylinder bottom (2) and a cylinder pipe (3), the cylinder bottom (2) and the cylinder pipe (3) are integrally formed to form a cylinder body main body (6), and the sleeve shoe (1) is fixedly sleeved on the bottom of the cylinder body main body (6) ; it further comprises an ear seat (4) and a connecting piece (5), the ear seat (4) is sleeved on the cylinder body main body (6) and welded to the cylinder body main body (6), and it is close to the cylinder port of the cylinder body main body (6) relative to the sleeve shoe (1), the sleeve shoe (1) and the ear seat (4) are connected through the connecting piece (5) ; the connecting piece (5) comprises a bolt (51) and a nut (52), both sides of the ear seat (4) are formed with lugs with holes, the sleeve shoe (1) is provided with a countersunk hole, and the bolt (51) is screwed with the nut (52) in sequence through the countersunk hole and the hole in the lug; alternatively, the sleeve shoe (1) and the cylinder body main body (6) are integrally formed. 2.The cylinder body of the hydraulic support jack according to claim 1, characterized in that: the cylinder bottom (2) and the cylinder pipe (3) are integrally formed by the whole forging shaping technology of positive extrusion and reverse extrusion; alternatively, the sleeve shoe (1), the cylinder bottom (2) and the cylinder pipe (3) are integrally formed by the whole forging shaping technology of positive extrusion and reverse extrusion. 3.The cylinder body of the hydraulic support jack according to claim 1, characterized in that: in the case of comprising the ear seat (4) and the connecting piece (5) : the side of the sleeve shoe (1) opposite to the cylinder body main body (6) is formed with a recess (11), and the cylinder body main body (6) is accommodated in the recess (11). 4.The cylinder body of the hydraulic support jack according to any one of claims 1-3, characterized in that: the side of the sleeve shoe (1) away from the cylinder body main body (6) extends in a direction away from the cylinder body main body (6) to form a circular truncated cone (12), and the circular truncated cone (12) is arranged in position corresponding to the cylinder bottom (2). 5.The cylinder body of the hydraulic support jack according to any one of claims 1-3, characterized in that: the center of the inner bottom wall of the cylinder body main body (6) protrudes inward to form a conical boss, the connection position of the inner bottom wall and the inner peripheral wall of the cylinder body main body (6) is rounded, and the inner bottom wall region between the conical boss and the inner peripheral wall forms an annular nest (61) ; the inner peripheral wall region of the cylinder port of the cylinder body main body (6) is formed with an inner stop (62) and an inner thread (63), and the inner stop (62) and the inner thread (63) are arranged in a direction from the inner bottom wall to the cylinder port. 6.The cylinder body of the hydraulic support jack according to any one of claims 1-3, characterized in that: the materials of the sleeve shoe (1), the cylinder bottom (2) and the cylinder pipe (3) are any one of 27SiMn, 30CrMnSi and 30CrMo. 7.The cylinder body of the hydraulic support jack according to any one of claims 1-3, characterized in that: the inner bottom wall and the inner peripheral wall in the cylinder body main body (6) are both provided with a corrosion-resistant layer.

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