Brake shoe shaft assembly for oil pumping unit

Abstract

The utility model relates to a part or part of a brake, in particular to a brake shoe shaft assembly for an oil pumping unit, which comprises a brake shoe shaft, one end of the brake shoe shaft is provided with an external thread section, the other end of the brake shoe shaft is provided with a brake hoop mounting section for sleeving a brake hoop, and the brake hoop mounting section is provided with an external thread section. A blocking head is detachably connected to the end, away from the external thread section, of the brake hoop installation section and provided with a blocking part protruding out of the brake shoe shaft in the radial direction. The brake shoe shaft set is used for solving the problem that a brake hoop of an existing brake shoe shaft set needs to be replaced on the ground, the purpose that the brake hoop can be replaced without disassembling a brake shoe shaft is achieved, the replacement time of the brake hoop is greatly shortened, and the working efficiency of operators is improved.

Description

Technical Field

[0001] The utility model relates to a component or part of a brake, in particular to a brake shoe shaft assembly for an oil pumping unit. Background Art

[0002] The walking beam pump is the main equipment for onshore oil production, and the brake is an important control unit of the pump. In addition to the maintenance of the brake body, all maintenance and maintenance operations of the pump are carried out under the condition of tightening the brake. Nowadays, the pump generally uses an external brake for braking. The external brake assembly is generally composed of a brake shoe shaft and two brake hoops movably mounted on the brake shoe shaft. A stop end is provided at the end of the brake shoe shaft away from the reduction box. A shaft sleeve is mounted on the brake shoe shaft. The two ends of the shaft sleeve are respectively pressed against the brake hoop and the reduction box. The two brake hoops are axially stopped and positioned through the shaft sleeve and the stop end. When the pump brakes, the two brake hoops move towards each other and hold the brake wheel tightly at the same time, and the wheel is braked to complete the braking action. However, during the production process, the brake hoop of the pump will be damaged after continuous opening and closing and wear, causing brake failure, affecting the normal maintenance and management of the pump well, and in severe cases, causing mechanical or personal accidents. Therefore, it is an important part of the maintenance of the pump to frequently check and adjust the brake device and replace the brake hoop in time after it is worn or broken.

[0003] Since there are many types of reducer boxes for oil pumps, the distance between the brake wheel and the reducer box also varies greatly with the type of reducer box, and the width of the brake wheel also has various specifications. In actual production, there is only one technical standard for the brake assembly, that is, the brake assembly with the same set of technical standards is used for different types of reducers, and the brake shoe shaft and the matching sleeve are of fixed size. Therefore, many problems will arise when the brake shoe shaft and the sleeve are installed on reducers of different models. For example, when the distance between the brake wheel and the reducer box is large, in order to ensure that the brake hoop and the brake wheel are aligned in the axial direction, the distance between the threaded section of the brake shoe shaft threaded assembly on the reducer box is short, and the two ends of the sleeve cannot be pressed on the brake hoop and the reducer box, and the positioning of the brake hoop cannot be achieved. In this way, after a period of use, the overhanging end of the brake shoe shaft will sink, causing the brake hoop to wear the brake pads, and the brake life is short; and when the distance between the brake wheel and the reducer box is small, it is limited by the length of the sleeve, so that the brake wheel and the brake hoop cannot correspond.

[0004] In order to solve the above problems, a Chinese utility model patent with authorization announcement number CN217926858U and authorization announcement date November 29, 2022 discloses a brake shoe shaft assembly for an oil pump and an oil pump, the brake shoe shaft assembly for the oil pump comprising a brake shoe shaft, one end of the brake shoe shaft being provided with a threaded section for threaded assembly on the reducer, the brake shoe shaft assembly for the oil pump also comprising two sleeves slidably mounted on the brake shoe shaft, the two sleeves being arranged on both axial sides of the brake hoop when in use, and being used to cooperate with the brake hoop stopper along the axial direction to limit the brake hoop, a top screw being provided on the sleeve, the top screw being used to pass through the sleeve radially and press the brake shoe shaft against the sleeve after the sleeve is installed in place to lock the brake shoe shaft with the sleeve. The prior art uses two sleeves and a top screw to limit the brake hoop. When in use, the sleeve has no connection with the reduction box, and only relies on the brake shoe shaft, which changes the traditional method that the sleeve must be pressed against the reduction box to limit the brake hoop. The prior art brake shoe shaft can be designed to be longer to ensure that the threaded section of the brake shoe shaft is reliably connected to the reduction box. At this time, no matter how the distance between the reduction box and the brake hoop changes, the limit can be completed by sliding the sleeve, which has strong versatility.

[0005] Although the existing technology has enhanced the versatility of the brake shoe shaft, when replacing the pumping unit brake hoop, the brake shoe shaft still needs to be removed and replaced on the ground, and 3-4 people are needed to cooperate in the installation when replacing the pumping unit brake shoe shaft assembly on the ground, which has the disadvantages of high operation intensity and high risk factor. Utility Model Content

[0006] The utility model provides a brake shoe shaft assembly for an oil pumping unit, which is used to solve the problem that the existing brake shoe shaft assembly adopts the ground replacement operation which generates high operation intensity and high risk factor.

[0007] In order to achieve the above-mentioned purpose, a brake shoe shaft assembly for an oil pumping unit of the utility model adopts the following technical methods:

[0008] A brake shoe shaft assembly for an oil pump comprises a brake shoe shaft, one end of which is provided with an external thread section, the other end of which is provided with a brake hoop mounting section for inserting a brake hoop, and an end of the brake hoop mounting section away from the external thread section is detachably connected with a stopper, the stopper having a stopper portion radially protruding from the brake shoe shaft.

[0009] Beneficial effects: The brake shoe shaft assembly for the oil pump of the utility model is an improved invention. In the prior art, when replacing the brake hoop, the brake shoe shaft assembly needs to be completely disassembled and installed after the ground installation is completed. The work intensity is too high and affects the working efficiency of the oil pump. The brake shoe shaft assembly for the oil pump of the utility model has a detachable connection stopper at the end away from the external threaded section. A stopper is provided on the stopper to limit the axial displacement of the brake hoop and other parts installed on the brake shoe shaft. When the brake hoop needs to be replaced, only the stopper needs to be removed to realize the disassembly of the brake hoop. When installing a new brake hoop, it can also be put on from the end of the brake shoe shaft away from the reduction box and stopped by installing the stopper. During the whole process, there is no need to disassemble the brake shoe shaft assembly as a whole, which greatly reduces the operation intensity and danger.

[0010] Furthermore, a stop screw is threadedly assembled on one end of the brake hoop mounting section away from the external thread section, and the stop portion is formed by a corresponding portion of the screw head of the stop screw.

[0011] Furthermore, the brake hoop mounting section is provided with an anti-loosening top screw for preventing the stop screw from loosening.

[0012] Furthermore, an outer support sleeve for supporting between the stopper and the brake hoop is sleeved on the brake hoop mounting section, and the anti-loosening screw passes through the sleeve wall of the outer support sleeve in the radial direction.

[0013] Furthermore, the outer support sleeve is slidably fitted with the brake hoop mounting section.

[0014] Furthermore, an outer support sleeve for supporting between the stopper and the brake hoop is sleeved on the brake hoop mounting section.

[0015] Furthermore, a dead brake disc mounting section is provided on the brake shoe shaft at one end close to the external thread section, and a brake disc locking nut for tightening the dead brake disc is provided between the brake hoop mounting section and the dead brake disc mounting section.

[0016] Furthermore, an anti-rotation screw cooperating with the brake shoe shaft is arranged on the brake disc locking nut.

[0017] Furthermore, an inner support sleeve is arranged between the dead brake disc mounting section and the external thread section.

[0018] Furthermore, a back-tightening nut for cooperating with a reduction box is installed on the external thread section. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the connection between the brake shoe shaft assembly, the brake hoop and the reduction box in the embodiment of the brake shoe shaft assembly for the oil pumping unit of the utility model;

[0020] Figure 2 for Figure 1 Sectional view along AA;

[0021] Figure 3 for Figure 1 Middle brake shoe shaft structure diagram.

[0022] Figure 1-3 In: 1. Pumping unit brake shoe shaft; 2. Speed ​​reducer; 201. Speed ​​reducer internal thread; 3. External thread section; 4. Tightening nut flat washer; 5. Tightening nut spring washer; 6. Tightening nut; 7. Internal support sleeve; 8. Dead brake disc; 9. Locking nut; 10. Anti-rotation screw; 11. First brake hoop; 12. Second brake hoop; 13. Internal thread section; 14. Stop screw external thread; 15. External support sleeve; 16. Flat washer; 17. Spring washer; 18. Stop screw; 19. Brake hoop installation section; 20. Anti-loosening screw; 21. Screw hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] The specific implementation of a brake shoe shaft assembly for an oil pumping unit of the utility model is as follows:

[0025] In a beam pumping unit, the brake is an important control device. There are many types of beam pumping unit reducers on the market, but there is only one standard for producing brake assemblies, which leads to many problems when the same type of brake assembly is installed on reducers of different beam pumping units. For example, when the distance between the brake wheel and the reducer is small, the brake wheel and the brake hoop cannot correspond due to the length of the shaft sleeve.

[0026] In view of the above problems, the prior art discloses a technical solution, which uses two sleeves and a top screw to limit the brake hoop. When limiting the brake hoop, the traditional method in which the sleeve must be pressed against the reduction box to limit the brake hoop is changed. Although this method enhances the versatility of the brake assembly, the brake shoe shaft still needs to be removed when replacing the brake hoop. After the dead brake disc and the brake hoop are assembled on the brake shoe shaft on the ground, the brake shoe shaft can be reinstalled on the reduction box.

[0027] Because the installation position of the brake shoe shaft is high from the ground, the replacement operation risk is relatively high. In order to protect the personal safety of the replacement personnel, the utility model hopes to achieve the purpose of sequentially installing the single-piece brake hoop on the brake shoe shaft of the oil pump without disassembling the brake shoe shaft and the dead brake disc. To achieve this purpose, the utility model sets the stopper of the brake shoe shaft as a detachable structure, and the single-piece brake hoop can be sequentially installed on the brake shoe shaft of the oil pump by simply removing the stopper.

[0028] Specifically, in Figure 1 In the embodiment 1 shown, which includes a dead brake disc 8, the pumping unit brake shoe shaft assembly is provided with an external threaded section 3 at one end of the brake shoe shaft 1 close to the reduction box 2, and the other end of the brake shoe shaft 1 is provided with a brake hoop mounting section 19 for the brake hoop to be inserted into and a stopper, and the stopper is provided with a stopper for stopping the brake hoop.

[0029] Specifically, Figure 1 and Figure 2 As shown, the stopper of the utility model can play the role of stopping parts from falling as long as one side protrudes from the corresponding outer contour of the brake shoe shaft 1. In this embodiment, the screw head of the stopper screw 18 is used as the stopper. In other foreseeable embodiments, other parts with a stopper function such as the bolt head of the fixing bolt and the nut can also be used as the stopper of the utility model.

[0030] The external thread section 3 of the brake shoe shaft is installed in the reduction box 2 through the internal thread 201 of the reduction box. The external thread section 3 is installed with a locking nut 9. The dead brake disc 8, the inner support sleeve 7, the back-up nut 6, the back-up nut flat washer 4 and the back-up nut spring washer 5 are installed in sequence outside the locking nut 9, and an anti-rotation top screw 10 is provided on the locking nut 9.

[0031] The brake hoop mounting section 19 of the brake shoe shaft is slidably inserted into the first brake hoop 11, the second brake hoop 12 and the outer support sleeve 15, and the stop screw 18 is rotated and installed through the internal thread section 13 of the brake shoe shaft. A flat washer 16 and a spring washer 17 are mounted on the external thread 14 of the stop screw, and a top screw hole 21 is provided on the stop screw 18, and an anti-loosening top screw 20 is installed in the top screw hole.

[0032] The installation process of the oil pump brake shoe shaft assembly is as follows:

[0033] First, rotate the locking nut 9 to the top of the thread of the external thread section 3, then install the dead brake disc 8 and slide it into the inner support sleeve 7. Then rotate and install the backing nut 6 from the external thread section 3, and then install the flat washer 4 and the spring washer 5 on the side of the backing nut 6 away from the locking nut 9. Then the brake shoe shaft 1 is assembled into the reducer internal thread 201 of the reduction box 2 through the external thread section 3, and the brake shoe shaft 1 is backed up by the backing nut 6. In other foreseeable embodiments, a spare nut can also be selected to replace the backing nut 6. Compared with the backing nut 6, the spare nut has the ability to withstand large loads and strong vibrations, and can be flexibly changed according to different types of pumping units. Then tighten the locking nut 9, and fix the dead brake disc 8 through the cooperation of the locking nut 9 and the inner support sleeve 7. The backing nut 6 presses on the reduction box 2 to prevent the brake shoe shaft 1 from loosening from the reduction box 2, and finally the locking nut 9 and the brake shoe shaft 1 are locked using the anti-rotation screw 10. In the exemplary embodiment, the locking nut 9 is used to lock the dead brake disc 8, but other parts that prevent the dead brake disc 8 from loosening, such as double nuts or anti-loosening nuts, can also be used. In addition, the inner support sleeve 7 can be selected to have a suitable length according to the spacing between the reduction box and the brake wheel of different models of the pumping unit to ensure that the dead brake disc 8 can accurately enter the brake groove of the brake wheel at the axial and radial positions of the pumping unit brake shoe shaft 1.

[0034] Specifically, the locking nut 9 is locked with the brake shoe shaft 1 by the anti-rotation screw 10 provided on the locking nut 9, thereby preventing the dead brake disc 8 from being displaced axially on the brake shoe shaft 1 due to the vibration of the uninterrupted operation of the oil pump, so that the dead brake disc 8 cannot accurately enter the brake groove of the brake wheel. Similarly, the locking nut 9 is locked with the brake shoe shaft 1 by the anti-rotation screw 10 provided on the locking nut 9, which can also ensure that the brake shoe shaft 1 will not tilt downward when the brake hoop is replaced, thereby preventing the brake device from sinking.

[0035] Then, slide the first brake hoop 11, the second brake hoop 12, and the outer support sleeve 15 onto the brake hoop mounting section 19 in sequence. After the first brake hoop 11 and the second brake hoop 12 are installed, they should be aligned with the brake wheel along the axial direction. Put the flat washer 16 and the spring washer 17 onto the outer thread 14 of the stop screw, and then rotate the stop screw 18 with the flat washer 16 and the spring washer 17 into the inner thread section 13 of the brake shoe shaft. The screw head of the stop screw 18 prevents the outer support sleeve 15, the flat washer 16 and other parts from being shaken off during use. After the outer support sleeve 15 positions and stops the first brake hoop 11 and the second brake hoop 12, use the anti-loosening top screw 20 to install it in the top screw hole 21 on the brake hoop mounting section 19, and lock the stop screw 18, the outer support sleeve 15 and the brake shoe shaft 1. At this time, the entire installation of the brake shoe shaft assembly is completed. It is foreseeable that the use of the anti-loosening screw 20 is not the only option in the present invention, and a fixed matching device such as a pin and a pin hole can also be used as the locking device of the present invention. Similarly, the flat washer 16 of the present invention can also use a stop washer and a locking washer; the spring washer 17 can also use a nylon washer or other parts that can fill the gap between two mechanical parts.

[0036] Specifically, the inner support sleeve 7 and the outer support sleeve 15 can be selected to have a suitable length according to the distance between the reduction box 2 and the brake wheel of different models and the length of the brake shoe shaft.

[0037] In another embodiment 2 which does not include the dead brake disc 8, the dead brake disc 8 is no longer provided on the external threaded section of the pumping unit brake shoe shaft assembly, and a shaft shoulder for stopping the brake hoop is additionally provided.

[0038] The installation process of the oil pump brake shoe shaft assembly is as follows:

[0039] First, select an inner support sleeve 7 of appropriate length and slide it into the brake shoe shaft 1, then rotate and install the back-tightening nut 6 from the external thread section 3, and then install the back-tightening nut flat washer 4 and the back-tightening nut spring washer 5 on the side of the back-tightening nut 6 away from the locking nut 9. The brake shoe shaft is assembled into the reducer internal thread 201 of the reducer 2 through the external thread section 3, and the brake shoe shaft 1 is tightened with the back-tightening nut 6.

[0040] Then, the first brake hoop 11, the second brake hoop 12, and the outer support sleeve 15 are slidably mounted on the brake hoop mounting section 19 in sequence, and the brake hoop is fixed on the brake shoe shaft 1 by the joint action of the shaft shoulder and the outer support sleeve 15. After the first brake hoop 11 and the second brake hoop 12 are installed, they should be aligned with the brake wheel along the axial direction. Figure 3As shown, the flat washer 16 and the spring washer 17 are mounted on the outer thread 14 of the stop screw, and then the stop screw 18 with the flat washer 16 and the spring washer 17 is screwed into the inner thread section 13 of the brake shoe shaft. After the outer support sleeve 15 positions and stops the brake hoop 11 and the brake hoop 12, the anti-loosening screw 20 is installed on the screw hole 21 on the brake hoop installation section 19, and the stop screw 18, the outer support sleeve 15 and the brake shoe shaft 1 are locked. At this time, all the installation work of the brake shoe shaft assembly of this embodiment is completed.

[0041] Specifically, the lengths of the two support sleeves must be sufficient to ensure that the brake hoop is aligned axially with the brake wheel after installation.

Claims

1. A brake shoe shaft assembly for an oil pump, comprising a brake shoe shaft, one end of which is provided with an external thread section, characterized in that: A brake hoop mounting section for inserting a brake hoop is provided at the other end of the brake shoe shaft, and a stopper is detachably connected to one end of the brake hoop mounting section away from the external thread section. The stopper has a stopper portion radially protruding from the brake shoe shaft.

2. The brake shoe shaft assembly for an oil pump according to claim 1, characterized in that: A stop screw is threadedly mounted on one end of the brake hoop mounting section away from the external thread section, and the stop portion is formed by a corresponding portion of the screw head of the stop screw.

3. The brake shoe shaft assembly for an oil pumping unit according to claim 2, characterized in that: The brake hoop mounting section is provided with an anti-loosening top screw for preventing the stop screw from loosening.

4. The brake shoe shaft assembly for an oil pumping unit according to claim 3, characterized in that: An outer support sleeve for supporting between the stopper and the brake hoop is also sleeved on the brake hoop installation section, and the anti-loosening top screw passes through the sleeve wall of the outer support sleeve in the radial direction.

5. The brake shoe shaft assembly for an oil pumping unit according to claim 4, characterized in that: The outer support sleeve is slidably matched with the brake hoop mounting section.

6. The brake shoe shaft assembly for an oil pumping unit according to claim 1 or 2, characterized in that: An outer support sleeve is also sleeved on the brake hoop installation section and is used to support between the stopper and the brake hoop.

7. The brake shoe shaft assembly for an oil pumping unit according to claim 1, characterized in that: A dead brake disc mounting section is also provided on the brake shoe shaft at one end close to the external thread section, and a brake disc locking nut for tightening the dead brake disc is provided between the brake hoop mounting section and the dead brake disc mounting section.

8. The brake shoe shaft assembly for an oil pumping unit according to claim 7, characterized in that: An anti-rotation jacking screw cooperating with the brake shoe shaft is arranged on the brake disc locking nut.

9. The brake shoe shaft assembly for an oil pumping unit according to claim 7, characterized in that: An inner support sleeve is arranged between the dead brake disc mounting section and the external thread section.

10. The brake shoe shaft assembly for an oil pumping unit according to claim 1, characterized in that: A back-tightening nut for cooperating with a reduction box is installed on the external thread section.

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