Piston rod of high-pressure coal slurry pump

Abstract

The utility model relates to the technical field of coal slurry pumps, in particular to a high-pressure coal slurry pump piston rod which comprises a piston rod body and a piston disc, the piston disc is sleeved on the outer side of the piston rod body, a piston check block is arranged on the piston rod body, the piston rod body is fixedly connected with the piston check block, and the piston check block is located on one side of the piston disc. A super nut is arranged on the other side of the piston disc and is in threaded connection with the piston rod body; the piston stop block is arranged on one side of the piston disc, a locking nut on the piston rod body is removed, and the situation that the locking nut is loosened, and consequently a high-pressure coal slurry pump breaks down is avoided; meanwhile, the super nut is arranged on the other side of the piston disc, damage to threads on the piston rod body caused by using a positioning bolt is avoided, so that it is guaranteed that the super nut is convenient to disassemble, and meanwhile, according to stable connection of the super nut and the piston rod body, stable clamping of the piston disc is achieved through the super nut and the piston check block; and stable and reliable connection of the piston disc is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of coal slurry pumps, in particular to a piston rod of a high-pressure coal slurry pump. Background Art

[0002] The coal slurry pump is used to pump the water-coal slurry produced by the coal mill to the next equipment. The piston rod in the coal slurry pump is in a frequent working state, so the maintenance and replacement frequency of the piston disc on the piston rod is high.

[0003] For example, the Chinese utility model patent with application number 202323036320.6 provides a high-pressure coal slurry pump piston rod that is easy to tighten. A piston body (i.e., a piston disc) is provided on the piston rod. In order to facilitate disassembly, two locking nuts are usually used on the piston rod to lock the piston body. In order to prevent the nut from loosening or falling off during the operation of the piston rod, a positioning hole is usually opened at the threaded position of the nut, and then a positioning bolt is used to tighten the piston rod along the positioning hole to achieve connection with the piston body.

[0004] join Figure 1 However, this method has the following disadvantages in connecting the piston body and the piston rod:

[0005] 1. The piston disc is difficult to disassemble. When the piston disc is disassembled during the maintenance process, the thread on the piston rod that cooperates with the locking nut will be partially damaged when the positioning bolt is tightened against the piston rod. This causes the locking nut to bite the thread during disassembly. If the locking nut is continued to be rotated for disassembly, the thread on the piston rod will fail and the piston rod will be scrapped. Therefore, the locking nut is usually directly damaged, which increases the difficulty of disassembly of the piston disc, reduces the disassembly efficiency, and also increases the disassembly cost.

[0006] 2. The connection of the piston disc is unreliable. When the piston rod of the high-pressure coal slurry pump reciprocates along its axial direction, the piston disc is frequently affected by the force of alternating direction changes, which will push the locking nuts on both sides at a high frequency, causing the positioning bolts and locking nuts to loosen easily, and the fixation of the piston disc will gradually fail. As a result, the piston disc will collide with the locking nuts and piston rod during operation, causing damage to the high-pressure coal slurry pump. At the same time, there will also be relatively serious safety hazards.

[0007] Therefore, the connection requirements between the piston disc and the piston rod cannot be met by this method. Utility Model Content

[0008] The utility model aims to provide a high-pressure coal slurry pump piston rod, which solves the technical problem that the piston rod and the piston disc in the current high-pressure coal slurry pump cannot be reliably connected.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A high-pressure coal slurry pump piston rod comprises a piston rod body and a piston disc, wherein the piston disc is sleeved on the outside of the piston rod body, a piston stopper is arranged on the piston rod body, the piston rod body is fixedly connected to the piston stopper, the piston stopper is located on one side of the piston disc, a super nut is arranged on the other side of the piston disc, and the super nut is threadedly connected to the piston rod body.

[0011] It is further defined that the piston stopper is fixedly connected to the piston rod body.

[0012] It is further defined that the piston stopper and the piston rod body are an integral structure.

[0013] It is further defined that the outer diameter of the piston stopper and the outer diameter of the super nut are both smaller than the outer diameter of the piston disc, and the cross-section of the piston stopper is a triangle, a square, a rectangle or a regular polygon.

[0014] It is further defined that the cross section of the piston stopper is a regular hexagon.

[0015] It is further defined that the thickness of the piston stopper is 40 mm to 60 mm.

[0016] It is further defined that the inner diameter of the super nut is 75 mm.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] 1. The utility model arranges a piston stopper on one side of the piston disc and removes the locking nut on the piston rod body to avoid the high-pressure coal slurry pump failure caused by loosening of the locking nut; at the same time, a super nut is arranged on the other side of the piston disc to avoid damage to the thread on the piston rod body by using the positioning bolt, thereby ensuring the convenient disassembly of the super nut. At the same time, according to the stable connection between the super nut and the piston rod body, the super nut and the piston stopper are used to achieve stable clamping of the piston disc, ensuring that the connection of the piston disc is stable and reliable, meeting the actual use requirements.

[0019] 2. The utility model further improves the stable support of the piston stopper on the piston disc by integrating the piston stopper with the piston rod body, so that the piston rod body and the piston disc are stably connected, while reducing the difficulty of disassembly and assembly of the piston disc and improving the maintenance and replacement efficiency.

[0020] 3. The utility model designs the cross-section of the piston stopper to be a triangle, quadrilateral or polygonal structure, so that the piston rod body can be limited by the piston stopper when the super nut is disassembled, which further facilitates the disassembly of the super nut and further improves the disassembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the connection structure between the existing piston disc and the piston rod body;

[0022] Figure 2 This is a schematic diagram of the connection structure between the piston disc and the piston rod body of the utility model;

[0023] Figure 3 This is a schematic diagram of the piston rod body of the utility model;

[0024] In the figure: 1-piston rod body; 2-piston disc; 3-piston stopper; 4-super nut; a-locking nut; b-positioning bolt. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is further described in detail in combination with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model. Specific details such as specific system structures and technologies are proposed in order to more thoroughly understand the embodiments of the utility model. The described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. However, it should be clear to those skilled in the art that the utility model can also be implemented in other embodiments without these specific details. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection disclosed by the present utility model.

[0026] refer to Figure 1 For the FELUWA coal slurry pump, the piston rod body 1 and the piston disc 2 used are installed by setting threads on the piston rod body 1 on both sides of the piston disc 2, and then installing the piston disc 2 to the corresponding position, and then matching the two locking nuts a with the threads on the piston rod body 1 to stably clamp the piston disc 2 on the piston rod body 1.

[0027] At the same time, a thread is arranged between the locking nut a and the piston disc 2. At this time, a positioning hole needs to be opened on the thread, and then a positioning bolt b is matched with the positioning hole, and the end of the positioning bolt b is tightened against the piston rod body 1. In order to improve the stable connection of the piston disc 2, the positioning bolt b will damage the thread thereon when tightening the piston rod body 1. At the same time, the thread will be shifted during the movement of the piston disc 2, and the positioning bolt b will further cause more serious damage to the thread, increasing the difficulty of disassembly and assembly of the locking nut a; at the same time, the piston disc 2 cannot be stably connected through the locking nut a and the positioning bolt b, and the piston disc 2 is prone to shaking during the working process, causing damage to the high-pressure coal slurry pump.

[0028] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0029] refer to Figure 2and Figure 3 The present embodiment provides a high-pressure coal slurry pump piston rod, which is used to improve the connection stability between the piston disc 2 and the piston rod body 1, including a piston rod body 1, a piston disc 2 and a super nut 4, wherein the piston disc 2 is sleeved on the piston rod body 1.

[0030] A piston stopper 3 is provided on the piston rod body 1, and the piston stopper 3 is fixedly connected to the piston rod body 1 so that one side of the piston disc 2 contacts the piston stopper 3. The super nut 4 is provided on the other side of the piston disc 2, and the super nut 4 is threadedly connected to the piston rod body 1, so that the piston disc 2 is limited by the super nut 4 and the piston stopper 3.

[0031] It is further explained that by replacing the existing locking nut a and positioning bolt b with the super nut 4 and the piston stopper 3, on the one hand, the damage to the thread on the piston rod body 1 caused by the positioning bolt b can be avoided, thereby ensuring that the super nut 4 can be smoothly disassembled and assembled, reducing the difficulty of disassembly and assembly of the piston disc 2 and improving the disassembly and assembly efficiency; on the other hand, the piston stopper 3 fixedly connected to the piston rod body 1 is used to limit one side of the piston disc 2, and the super nut 4 is used to limit the other side of the piston disc 2, thereby further improving the stable clamping of the piston disc 2, improving the safety and reliability of the use of the piston disc 2, ensuring the reliable connection between the piston disc 2 and the piston rod body 1, and meeting actual use requirements.

[0032] Specifically, the piston stopper 3 can be selectively sleeved on the piston rod body 1 and connected to the piston rod body 1 by welding.

[0033] In order to reduce the processing difficulty and improve the stable support for the piston disc 2, it is preferred that the piston stopper 3 and the piston rod body 1 are an integrated structure, that is, the piston rod body 1 and the piston stopper 3 are processed and formed during forging.

[0034] In order to increase the service life of the piston rod body 1, hard chrome plating is selected on the surface of the piston rod body 1, and the thickness of the hard chrome plating layer is 0.15mm-0.2mm; the piston rod body 1 needs to be tempered.

[0035] In order to clamp the piston rod body 1 to prevent it from rotating when the super nut 4 is tightened and installed or loosened and disassembled with the piston rod body 1, the cross-section of the piston stopper 3 is preferably designed to be a triangular, quadrilateral or polygonal structure, such as an equilateral triangle, rectangle, square, regular hexagon or regular octagon, and the thickness of the piston stopper 3 can be selected to be 40mm to 60mm.

[0036] When the super nut 4 is installed, the piston stopper 3 is engaged with other components such as a wrench to fix the rotation of the piston rod body 1, which facilitates the reliable connection between the super nut 4 and the piston rod body 1. The inner diameter of the super nut 4 can be selected to be 75 mm.

[0037] The super nut 4 includes a hard washer, a nut, and multiple top cone screws threadedly connected to the nut. The multiple top cone screws are arranged at equal intervals around the axis of the nut. The number of top cone screws is, for example, 8. The nut is connected to the hard washer. The top cone screw is used to generate an axial thrust force to tighten the hard washer, thereby preventing the super nut 4 from loosening.

[0038] When actually in use, the piston stopper 3 can be set on the non-driving side of the piston rod body 1, and then the piston disc 2 can be sleeved on the corresponding position of the piston rod body 1, and finally the super nut 4 can be screwed to clamp the piston disc 2 to achieve the connection of the piston disc 2 and facilitate disassembly and assembly.

[0039] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure coal slurry pump piston rod, characterized in that: The invention comprises a piston rod body (1) and a piston disc (2), wherein the piston disc (2) is sleeved on the outer side of the piston rod body (1), a piston stopper (3) is arranged on the piston rod body (1), the piston rod body (1) and the piston stopper (3) are fixedly connected, the piston stopper (3) is located on one side of the piston disc (2), and a super nut (4) is arranged on the other side of the piston disc (2), and the super nut (4) is threadedly connected to the piston rod body (1).

2. The high-pressure coal slurry pump piston rod according to claim 1, characterized in that: The piston stopper (3) is welded to the piston rod body (1).

3. The high-pressure coal slurry pump piston rod according to claim 1, characterized in that: The piston stopper (3) and the piston rod body (1) are an integrated structure.

4. The high-pressure coal slurry pump piston rod according to claim 2 or 3, characterized in that: The outer diameters of the piston stopper (3) and the super nut (4) are both smaller than the outer diameter of the piston disc (2); the cross section of the piston stopper (3) is a triangle, a square, a rectangle or a regular polygon.

5. The high-pressure coal slurry pump piston rod according to claim 4, characterized in that: The cross section of the piston stopper (3) is a regular hexagon.

6. The high-pressure coal slurry pump piston rod according to claim 5, characterized in that: The thickness of the piston stopper (3) is 40 mm to 60 mm.

7. The high-pressure coal slurry pump piston rod according to claim 6, characterized in that: The inner diameter of the super nut (4) is 75 mm.

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