Combined auxiliary tool for grinding middle cylinder dynamic sealing surface of hydraulic stand column

Abstract

The utility model discloses a combined auxiliary tool for grinding a movable sealing surface of a middle cylinder of a hydraulic stand column, which is used for solving the technical problem that the coaxiality is out of tolerance when a sealing part of a middle cylinder component is machined, and belongs to the technical field of grinding. The device comprises an adjustable top tray and an expansion spring combined top tray, the adjustable top tray comprises a fixed cylinder with a round bottom and adjusting bolts, and the adjusting bolts are uniformly distributed and screwed on the outer wall of the fixed cylinder from the outside to the inside of the outer wall of the fixed cylinder; the expansion spring combined top disc comprises an expansion spring body and a limiting cylinder with a round bottom, the outer wall of the limiting cylinder is provided with an inward taper, the expansion spring body is an annular elastic mechanism, the limiting cylinder can move in the expansion spring body, and the expansion spring body can be expanded or retracted along with the conical slope of the outer wall of the limiting cylinder. An inner hole is automatically aligned at one end of the movable sealing surface of the middle cylinder through the expansion spring combined top tray, and the coaxiality of the other end of the movable sealing surface of the middle cylinder can be accurately adjusted to be within 0.05 mm through the alignment effect of the adjusting bolt of the adjustable top tray.

Description

Technical Field

[0001] The utility model belongs to the technical field of grinding processing, and relates to the dynamic sealing surface of the middle cylinder of a hydraulic support column. Specifically, it is a combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic support column. Background Technique

[0002] The hydraulic support column is the main support of the support, bearing the heavy responsibility of protecting the safety of coal mining operations. Its structure mainly includes an outer cylinder body assembly, a middle cylinder assembly, a piston rod assembly, a guide sleeve assembly, an extension rod assembly, etc. Among them, the middle cylinder assembly is composed of a middle cylinder bottom 5 and a middle cylinder barrel 2 welded together. In a double-extension column, the middle cylinder bottom part is the piston sealing part, and the middle cylinder barrel part is the rod sealing part. When the double-extension column is working, the outer circle of the middle cylinder barrel of the middle cylinder assembly, together with the guide sleeve, the middle cylinder piston, and the middle cylinder bottom, forms a sealed interval. By continuously inputting emulsion into the sealed interval and pushing the middle cylinder assembly to contract as the bottom valve opens, the lowering of the support is completed. Therefore, in addition to requiring a high finish on the sealing parts of the middle cylinder assembly, the piston sealing part, the rod sealing part, and the cylinder mouth of the middle cylinder barrel of the middle cylinder assembly must meet the coaxiality requirement of Φ0.05mm. In order to achieve a good sealing effect, the processing method of the rod sealing part of the middle cylinder assembly is usually carried out by an external cylindrical grinding machine, and the clamping method is usually the two-center method, that is, the double chuck tightening method. The middle cylinder assembly and the chuck are in surface contact. This grinding method has the advantages of quick clamping, but its disadvantage is that the middle cylinder assembly cannot be aligned during clamping, and the grinding process benchmark depends on the previous machining process. The bottom valve hole must be machined and formed after welding, and the process limitations are large.

[0003] The following problems exist in actual production:

[0004] 1. When the bottom valve hole and the cylinder mouth are not coaxial, the coaxiality of the outer circle of the middle cylinder barrel, the piston, and the cylinder mouth exceeds the tolerance. The designed clearance reserved for the fit between the guide sleeve and the cylinder barrel is not sufficient to compensate for the value of the coaxiality deviation. That is, during the assembly of the support column, due to the excessive deviation of the center lines of the piston, the rod outer circle, and the cylinder mouth from the reference center line (i.e., the coaxiality deviation exceeds the tolerance), the guide sleeve will be affected by abnormal resistance during the screwing process, and ultimately it may lead to assembly abrasion and cause quality problems;

[0005] 2. When grinding a middle cylinder assembly with a long grinding length, if uneven grinding occurs, this clamping method cannot be adjusted, and ultimately it will lead to some parts of the middle cylinder assembly not being machined in place, resulting in product quality problems. Content of the Utility Model

[0006] In order to overcome the above defects of the prior art, the purpose of the present utility model is to provide a combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic prop, which is used to solve the technical problem of out-of-tolerance coaxiality during the machining of the sealing part of the middle cylinder assembly. When grinding with this combined auxiliary tool, according to the design reference, the grinding process reference of the dynamic sealing surface of the middle cylinder assembly is reasonably determined. On the one hand, an adjustable top plate is designed using the principle of clamping with a four-jaw chuck. On the other hand, a tensioning combined device is designed using the automatic centering principle of the expansion spring. At the same time, the grinding clamping method is determined in combination with the structural characteristics of the grinding machine.

[0007] The present utility model is implemented by adopting the following technical solutions:

[0008] A combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic prop includes an adjustable top plate and an expansion spring combined top plate. The adjustable top plate includes a fixed cylinder with a first round bottom and adjusting bolts. The adjusting bolts are evenly arranged on the outer wall of the fixed cylinder and are screwed from the outside to the inside on the outer wall of the fixed cylinder. The expansion spring combined top plate includes an expansion spring body and a limiting cylinder with a second round bottom. The outer wall of the limiting cylinder is provided with a taper towards the inside. The expansion spring body is an annular elastic mechanism. The limiting cylinder can move inside the expansion spring body. The expansion spring body can open or retract along with the conical slope on the outer wall of the limiting cylinder. Round holes for assembling with the tip head are arranged on the outside of the first round bottom and the second round bottom.

[0009] During application, the adjustable top plate is installed on the round table at the bottom of the middle cylinder of the middle cylinder assembly, and the expansion spring combined top plate is installed into the cylinder mouth of the middle cylinder barrel of the middle cylinder assembly. After installation, the middle cylinder assembly and the combined auxiliary tool are installed on the grinding machine and tightened with a tip. The piston part is aligned by using an internal diameter dial indicator (adjusted through the adjusting bolts on the adjustable top plate). The coaxiality is accurately adjusted to within 0.05 mm before starting the grinding process.

[0010] Further preferably, a stepped circle coaxial with the first round bottom is arranged on the outside of the first round bottom, a stepped circle coaxial with the second round bottom is arranged on the outside of the second round bottom, and the round holes are arranged on the outside of the stepped circles.

[0011] Further preferably, the maximum diameter of the expansion spring body when it is expanded is not greater than the maximum diameter of the limiting cylinder.

[0012] Further preferably, a plurality of expansion slots parallel to the axis are evenly arranged on the expansion spring body. The openings of the expansion slots face one side or the other side of the expansion spring body, and the openings of adjacent expansion slots are arranged on the expansion spring body with opposite orientations.

[0013] Further preferably, one or more weight-reducing holes are arranged on the first round bottom and the second round bottom.

[0014] The beneficial effects of the present utility model compared with the prior art:

[0015] ① Optimized the machining sequence of the bottom valve hole, enabling the bottom valve hole to be machined before welding, thus improving production efficiency;

[0016] ② Changed the top plate structure, making the clamping method improved to an adjustable type, with higher coaxiality accuracy between the inside and outside of the middle cylinder assembly, and the product quality has been improved;

[0017] ③ This combined auxiliary tool is also suitable for the machining scope of cylindrical parts with similar structures and high-precision coaxiality requirements. Brief Description of the Drawings

[0018] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present utility model, and are used together with the specification to explain the principles of the present utility model.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It shows a schematic diagram of the existing clamping method.

[0021] Figure 2 It shows a schematic diagram of the limiting cylinder of the present utility model.

[0022] Figure 3 It shows a schematic diagram of the expansion spring body of the present utility model.

[0023] Figure 4 It shows a schematic diagram of one perspective of the adjustable top plate of the present utility model.

[0024] Figure 5 It shows a schematic diagram of another perspective of the adjustable top plate of the present utility model.

[0025] Figure 6 It shows a schematic diagram of the clamping method of the present utility model.

[0026] In the figure: 1 - cylinder port, 2 - middle cylinder barrel, 3 - dynamic sealing surface, 4 - piston, 5 - middle cylinder bottom, 6 - bottom valve hole, 7 - adjustable top plate, 71 - fixed cylinder, 72 - adjusting bolt, 73 - first round bottom, 8 - expansion spring combined top plate, 81 - expansion spring body, 82 - limiting cylinder, 83 - expansion slot, 84 - second round bottom. Detailed Description of the Embodiments

[0027] In order to more clearly understand the above-mentioned objects, features, and advantages of the present utility model, the following will further describe the solution of the present utility model. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0028] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0029] In the following description, many specific details are set forth in order to fully understand the present utility model, but the present utility model can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0030] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings.

[0031] A combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic column includes an adjustable top plate 7 and a spring-expanding combined top plate 8. The adjustable top plate 7 includes a fixed cylinder 71 with a first round bottom 73 and adjusting bolts 72. The adjusting bolts 72 are evenly arranged on the outer wall of the fixed cylinder 71, and the adjusting bolts 72 are screwed from the outside to the inside on the outer wall of the fixed cylinder 71. The spring-expanding combined top plate 8 includes a spring body 81 and a limiting cylinder 82 with a second round bottom 84. The outer wall of the limiting cylinder 82 is provided with a taper towards the inside. The spring body 81 is an annular elastic mechanism, and the limiting cylinder 82 can move inside the spring body 81. The spring body 81 can expand or retract along with the conical slope of the outer wall of the limiting cylinder 82. Round holes for assembling with the tip head are provided on the outside of the first round bottom 73 and the second round bottom 84. Preferably, the number of adjusting bolts 72 is four.

[0032] In order to save materials, reduce weight, and facilitate the movement of the combined auxiliary tool, one or more weight-reducing holes are provided in the first round bottom 73 and the second round bottom 84.

[0033] As Figure 3 shown, the form that the spring body 81 can adopt is that a plurality of spring slits 83 parallel to the axis are evenly arranged on the spring body 81. The openings of the spring slits 83 face one side or the other side of the spring body 81, and the openings of adjacent spring slits 83 are arranged on the spring body 81 with opposite orientations.

[0034] To enable better cooperation between the expansion spring body 81 and the limiting cylinder 82, the maximum diameter of the expansion spring body 81 when it is expanded is not greater than the maximum diameter of the limiting cylinder 82.

[0035] A stepped circle coaxial with the first round bottom 73 is arranged on the outside of the first round bottom 73, and a stepped circle coaxial with the second round bottom 84 is arranged on the outside of the second round bottom 84. The round hole is arranged on the outside of the stepped circle, which can make the combined auxiliary tool more firmly fixed.

[0036] When using the combined auxiliary tool for grinding and clamping the middle cylinder assembly, the double-top method is also adopted. The power is provided by the main shaft driving the fork. The difference is that the grinding process benchmark is determined as the bottom valve hole 6 and the inner hole of the cylinder port, and the ordinary standard top plates are respectively replaced with the adjustable top plate 7 and the expansion spring combined top plate 8.

[0037] During the grinding process, at the 1 end of the cylinder port, the inner hole is automatically aligned by the expansion spring combined top plate 8. At the bottom valve hole 6 end, the four adjusting bolts 72 of the adjustable top plate 7 play the role of aligning a four-jaw chuck, and cooperate with an internal diameter dial indicator to measure and align the piston 4 part. During the alignment process, the operator adjusts the adjusting bolts 72 in turn, and the coaxiality can be accurately adjusted to within 0.05 mm.

[0038] The steps of using the combined auxiliary tool are as follows:

[0039] ① Install the expansion spring combined top plate 8 at the 1 end of the cylinder port of the middle cylinder assembly;

[0040] ② Install the adjustable top plate 7 on the round platform at the bottom end of the middle cylinder assembly;

[0041] ③ Install the middle cylinder assembly and the combined auxiliary tool on the grinding machine and tighten them with the center points;

[0042] ④ Use an internal diameter dial indicator with a magnetic chuck to adjust the four adjusting bolts 72 of the adjustable top plate on the outer circle of the piston 4 at the same time until the indicator shows within Φ0.05 mm, and then grinding can be carried out.

[0043] The utility model makes use of the automatic tightening principle when the expansion spring and the top plate are tightly matched to quickly align the grinding process benchmark during processing, which is consistent with the design benchmark and has accurate positioning; the use of this combined auxiliary tool avoids the drawback that the original grinding and clamping method cannot be aligned, making the control of the geometric tolerance in grinding more reliable and accurate; the use principle of this kind of auxiliary tool can be extended to the grinding processing technology field of cylindrical parts with similar structures.

[0044] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Although the foregoing embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic column, characterized in that: The invention comprises an adjustable top plate (7) and a tension spring combination top plate (8). The adjustable top plate (7) comprises a fixed cylinder (71) with a first round bottom (73) and an adjusting bolt (72). The adjusting bolt (72) is evenly arranged on the outer wall of the fixed cylinder (71). The adjusting bolt (72) is screwed on the outer wall of the fixed cylinder (71) from the outside to the inside. The tension spring combination top plate (8) comprises a tension spring body (81) and a limiting cylinder (82) with a second round bottom (84). The outer wall of the limiting cylinder (82) is provided with an inward taper. The tension spring body (81) is an annular elastic mechanism. The limiting cylinder (82) can move inside the tension spring body (81). The tension spring body (81) can be opened or retracted along with the tapered slope of the outer wall of the limiting cylinder (82). The first round bottom (73) and the second round bottom (84) are provided with round holes on the outer sides thereof for assembling with the top head.

2. The combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic column according to claim 1 is characterized in that: A step circle coaxial with the first circular bottom (73) is arranged outside the first circular bottom (73), a step circle coaxial with the second circular bottom (84) is arranged outside the second circular bottom (84), and the circular hole is arranged outside the step circle.

3. The combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic column according to claim 1 is characterized in that: The limit diameter of the tension spring body (81) when expanded is no greater than the maximum diameter of the limiting cylinder (82).

4. A combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic column according to any one of claims 1 to 3, characterized in that: The expansion spring body (81) is evenly provided with a plurality of expansion slits (83) parallel to the axis, the expansion slits (83) opening towards one side or the other side of the expansion spring body (81), and adjacent expansion slits (83) opening towards opposite sides are arranged on the expansion spring body (81).

5. A combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic column according to any one of claims 1 to 3, characterized in that: The first circular bottom (73) and the second circular bottom (84) are provided with one or more weight-reducing holes.

6. The combined auxiliary tool for grinding the dynamic sealing surface of the middle cylinder of a hydraulic column according to claim 4, characterized in that: The first circular bottom (73) and the second circular bottom (84) are provided with one or more weight-reducing holes.

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