Pumping unit brake electric control modified assembly

Abstract

The invention relates to the technical field of oil exploitation equipment, and provides an oil pumping unit brake electric control refitting assembly. The assembly comprises an electric control brake suite and an electric control parking suite, the electric control brake suite is provided with a box body, a transverse sliding block, an electric push rod, a connecting rod and a connecting plate, and the electric control parking suite is provided with a mounting seat, a parking motor, a parking sliding block, a parking tooth block and a parking tooth disc. Two-way control of hand brake and electric control is achieved, automatic operation can be achieved through a PLC, installation is easy and convenient, an original brake system does not need to be transformed on a large scale, the remote control function is achieved, operation safety is improved, and the service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil extraction equipment, and discloses an electric control refitting assembly for a pumping unit brake. BACKGROUND

[0002] A beam pumping unit is a widely used mechanical device in oilfield exploitation, and its brake system is crucial for the safety of device maintenance and well repair operations. Traditional pumping unit brake systems usually adopt a manual operation mode, including a hand brake mechanism and a band brake mechanism. The hand brake mechanism is operated by an operator pulling a hand brake lever, and through transmission components such as a cross pull rod, a reversing mechanism and a vertical pull rod, finally making the brake shoe tightly hold the brake wheel to realize braking. This purely mechanical brake mode has obvious disadvantages: the operator must be present on site for operation, which is labor-intensive and inefficient; there are safety hazards in bad weather or night operations; remote control and automatic operation cannot be realized, which is not compatible with the development trend of modern oilfield digitization and intelligentization. In addition, the manual brake is difficult to accurately control the brake force, which may cause the brake to be too tight or too loose, affecting the service life of the equipment and the safety of the operation.

[0003] Chinese patent document CN210196316U discloses an automatic brake device for a pumping unit, which includes a brake control cabinet, a PLC controller, a servo motor, an electric push rod and a pull rod assembly. The PLC controller receives driving instructions from the pumping unit controller, controls the servo motor to drive the electric push rod to perform extension or retraction operation, and drives the pumping unit brake crank to rotate to realize automatic braking. When the manual brake is needed, the pin shaft connecting the electric push rod and the pull rod assembly needs to be removed, and the pull rod assembly needs to be connected with the manual brake device. Although this technical solution realizes the automatic brake function, it still has the following disadvantages: the switching between manual and automatic brake modes needs to be realized by disassembling and installing the pin shaft, which is tedious and has the risk of losing the pin shaft; the device needs to be greatly modified from the original brake system, which is complex to install and has a high cost; the device structure is relatively complex, which is inconvenient to maintain; and no special parking protection mechanism is provided, which may have safety hazards when parked for a long time.

[0004] Another Chinese patent document CN206377184U discloses a remote control automatic brake device for pumping unit, which comprises a brake executing device and an electric control cabinet. The brake executing device is driven by a linear motor, and the brake shoe is retracted or released to realize braking through the reciprocating movement of the linear motor to drive the brake cam to rotate. The device can realize automatic braking through the remote control terminal to receive instructions. However, this technical solution also has obvious defects: the structure driven by the linear motor is relatively complex, and the manufacturing cost is high; the device needs to be installed in parallel with the original manual brake system, and occupies a large space; the compatibility with the original hand brake mechanism is not considered, which may cause mutual interference between the two systems; there is also a lack of reliable parking protection mechanism; and the original brake system needs to be greatly changed during installation, which has a large amount of reconstruction engineering.

[0005] In summary, the pumping unit brake systems and related automatic brake devices in the prior art generally have the following problems: manual operation is inconvenient and has safety hazards; the automatic brake device has a complex structure, a large amount of installation and reconstruction engineering, and high cost; the switching operation between manual and automatic modes is tedious; there is a lack of reliable parking protection function; and the compatibility with the original brake system is poor, which makes the reconstruction difficult. Therefore, it is of great significance to develop a pumping unit brake electric control retrofit assembly with simple structure, easy installation, low cost, and capable of realizing hand brake and electric control dual control without mutual interference, and having reliable parking protection function, for improving the operation safety of pumping unit, reducing the labor intensity, and adapting to the development needs of oilfield digitalization. SUMMARY

[0006] The purpose of the present application is to solve the problems of the prior art, and to provide a pumping unit brake electric control retrofit assembly, which solves the following technical problems: the existing pumping unit brake system relies on manual operation, which has high labor intensity, high safety hazards, and cannot realize remote control and automatic operation; the existing automatic brake device has a complex structure, a large amount of installation and reconstruction engineering, and high cost, and lacks reliable parking protection mechanism; the switching operation between manual and automatic modes is tedious; and the compatibility with the original brake system is poor, which makes the reconstruction difficult.

[0007] In order to achieve the above object, the present application adopts the following technical scheme: A brake electric control retrofit assembly of a pumping unit, which is suitable for a beam-type pumping unit brake system with a hand brake mechanism and a brake band brake mechanism, the hand brake mechanism comprises a bracket, a hand brake body, a hand brake handle, a cross pull rod and a reversing mechanism, the brake band brake mechanism comprises a brake wheel, a brake shoe and a small pull rod, and the brake electric control retrofit assembly comprises: an electric control brake set, the electric control brake set comprises a box body, a transverse sliding block slidably arranged in the box body, an electric push rod driving the transverse sliding block, a connecting rod connected with the transverse sliding block, and a connecting plate connected with the connecting rod, the connecting plate is used for connecting the cross pull rod; an electric control parking set, the electric control parking set comprises a mounting seat, a parking motor arranged on the mounting seat, a parking sliding block driven by the parking motor, a parking tooth block arranged on the parking sliding block, and a parking tooth disc matched with the parking tooth block.

[0008] Preferably, parallel sliding grooves are formed in the side surface of the box body, and sliding steps are arranged on the two sides of the transverse sliding block and slidably matched with the parallel sliding grooves.

[0009] Preferably, a reset spring is sleeved on the connecting rod.

[0010] Preferably, the mounting seat comprises a box body and a mounting plate, a through hole is formed in the bottom of the box body for the output shaft of the parking motor to pass through, and a mounting hole is formed in the mounting plate.

[0011] Preferably, a threaded hole is formed in the top of the parking sliding block and threadedly connected with a screw rod on the output shaft of the parking motor.

[0012] Preferably, an arc-shaped sliding groove is formed in the bottom of the parking sliding block, and a T-shaped sliding rail is arranged on the top of the parking tooth block and slidably matched with the arc-shaped sliding groove.

[0013] Preferably, the electric control brake set further comprises an electric control box, and the electric control box is internally provided with an intelligent control PLC, a brake reversing controller and a parking reversing controller.

[0014] Preferably, the electric control brake set further comprises an upper dead point sensing switch and a lower dead point sensing switch, which are used for sensing the operating position of the pumping unit.

[0015] Preferably, the electric control brake set further comprises a brake state detection switch and a parking state detection switch.

[0016] Preferably, the electric control brake set further comprises a voice module and an alarm horn.

[0017] The present application has the following advantages: the present application provides an electric control refitting assembly for a pumping unit brake, which can realize double-path control of hand brake and electric control without interference, and does not need to make large-area modification to the original brake system during installation, only needs to replace the tie rod, and has low modification cost. The assembly can realize automatic brake and parking operation through cooperation of the electric control brake kit and the electric control parking kit, and improves operation safety. The electric control part integrates intelligent control PLC, induction switch and voice module, can automatically execute stop brake and release parking start-up process according to the running position of the pumping unit, has voice warning function, supports local and remote control, reduces manual labor intensity, and improves equipment operation reliability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is an electric control brake kit structure schematic diagram; Figure 2 is an electric control parking kit structure schematic diagram; Figure 3 is Figure 1 a C-C cross-section structure schematic diagram in the electric control parking kit; Figure 4 is Figure 2 an A-A cross-section structure schematic diagram in the electric control parking kit; Figure 5 is an electric control parking kit cross-section structure schematic diagram; Figure 6 is Figure 2 a B-B cross-section structure schematic diagram in the electric control parking kit; Figure 7 is a parking tooth block and parking tooth disc cooperation relationship schematic diagram; Figure 8 is Figure 7 a D-D cross-section structure schematic diagram in the electric control parking kit; Figure 9 is an electric control box schematic diagram; Figure 10 is an electric control part structure schematic diagram; Figure 11 is a stop logic schematic diagram; Figure 12 is a start logic schematic diagram; In the figure, 1, hand brake lever, 2, hand brake body, 3, connecting rod, 4, bracket, 5, box body, 6, transverse sliding block, 7, connecting rod, 8, electric push rod, 9, return spring, 10, connecting plate, 11, horizontal pull rod, 12, first reversing lever, 13, vertical pull rod, 14, second reversing lever, 15, screw rod, 16, mounting hole, 17, mounting seat, 18, parking sliding block, 19, parking tooth block, 20, parking tooth disc, 21, brake wheel, 22, input shaft, 23, brake shoe, 24, parking motor, 25, mounting plate, 28, parking tooth block, 501, parallel sliding groove, 601, sliding step, 1701, box body, 1801, arc-shaped sliding groove, 2801, T-shaped sliding rail, 2501, mounting hole. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0020] The present application is applicable to the walking beam pumping unit brake system with a hand brake mechanism and a brake catch brake mechanism.

[0021] The power part of the walking beam pumping unit usually comprises a motor, a belt, a gear box, the power of the motor is transmitted to the gear box through the belt, and the input shaft 22 on the gear box is provided with a brake system.

[0022] The hand brake mechanism comprises: a bracket 4, which is fixed to the base or other fixed building of the pumping unit and is used for mounting the hand brake body 2; the hand brake body 2, which is fixed to the bracket 4 and is provided with a ratchet; the hand brake lever 1, which is hinged to the hand brake body 2 and is provided with a pawl engaged with the ratchet; the horizontal pull rod 11, one end of which is hinged to the hand brake lever 1 and the other end of which is hinged to the reversing mechanism, which is used for transmitting the pulling force of the hand brake lever 1; the reversing mechanism, which is composed of the first reversing lever 12 and a base, the first reversing lever 12 is L-shaped, is hinged to the base at the corner, one end of which is hinged to the horizontal pull rod 11 and the other end of which is hinged to the vertical pull rod 13, which is used for changing the direction of the pulling force.

[0023] The brake catch brake mechanism comprises: the brake wheel 21, which is fixed to the input shaft 22; the brake shoe 23, which is fixed to the gear box body 5, wraps around the outer periphery of the brake wheel 21, and has an opening at one end, and is provided with a spring, a small pull rod and the like, the small pull rod is hinged to the vertical pull rod 13 through the second reversing lever 14.

[0024] When the hand brake lever 1 is pulled, the hand brake lever 1 sequentially drives the horizontal pull rod 11, the first reversing lever 12, the vertical pull rod 13, the second reversing lever 14 and the small pull rod, so that the opening is contracted, the brake shoe 23 tightly holds the brake wheel 21, and the brake is realized.

[0025] The above part is the conventional structure of the beam-pumping unit, which is the prior art, and the specific technical details will not be described herein.

[0026] Embodiment 1

[0027] The electric control retrofit assembly for the brake of the pumping unit comprises an electric control brake kit, which comprises a box body 5, which is square as a whole, is provided with a connecting rod 3 hinged with a hand brake handle 1 at the front end, and is provided with two parallel sliding grooves 501 on the side surface, the parallel sliding grooves 501 are consistent with the movement direction of a horizontal pull rod 11, and the length of the parallel sliding grooves 501 and the working stroke of an electric push rod 8 are both greater than or equal to the brake stroke of the hand brake mechanism; the horizontal sliding block 6 is plate-shaped, is provided with sliding steps 601 on both sides, is slidably matched with the parallel sliding grooves 501, and is slidably assembled in the parallel sliding grooves 501; the electric push rod 8 is fixedly connected with the horizontal sliding block 6 at the working end and is fixedly arranged at the inner side of the rear end of the box body 5 at the bottom; the connecting rod 7 is provided with a through hole for accommodating the connecting rod 7 to pass through at the rear end of the box body 5, is fixedly connected with the horizontal sliding block 6 at the front end and is fixedly connected with a connecting plate 10 outside the rear end of the box body 5 at the rear end; the connecting plate 10 is a plate body, is fixedly connected with the connecting rod 7 on one side and is fixedly connected with the horizontal pull rod 11 on the other side, and the connecting rod 7 between the box body 5 is sleeved with a return spring 9.

[0028] When the brake system of the beam-pumping unit is installed with the brake kit, the hand brake and the electric control can be controlled in two ways, and the two ways of control do not affect each other, the original brake system does not need to be transformed in a large area when the kit is installed, and only the horizontal pull rod 11 needs to be replaced, so that the transformation cost is low.

[0029] The principle of the brake kit is that when the hand brake function is used, the electric push rod 8 is in a non-powered state, the horizontal sliding block 6 is located at the rear end of the parallel sliding groove 501 under the action of the return spring 9, the hand brake handle 1 is pulled, the hand brake handle 1 drives the box body 5 to move forward through the connecting rod 3, when the box body 5 moves forward, the electric push rod 8 located at the inner side of the rear end of the box body 5 is already in the retracted state, therefore, the electric push rod 8 drives the horizontal sliding block 6 to move forward, the horizontal sliding block 6 drives the connecting plate 10 and the horizontal pull rod 11 in turn through the connecting rod 7, and then the hand brake operation is completed.

[0030] When the electric control function is used, the electric push rod 8 is started, the electric push rod 8 drives the horizontal sliding block 6 to move forward along the parallel sliding groove 501, the horizontal sliding block 6 drives the connecting plate 10 and the horizontal pull rod 11 to move forward in turn through the connecting rod 7, and the brake operation is completed.

[0031] Embodiment 2

[0032] The electric control brake modification assembly of the pumping unit further comprises an electric control parking kit, and the electric control parking kit comprises: a mounting seat 17 provided with a box body 1701 with an opening downward and a mounting plate 25, the box body 1701 is provided with a through hole at the bottom for accommodating the output shaft of the parking motor 24 to pass through, and the mounting plate 25 is provided with a mounting hole 162501 for being fixed to the pumping unit, such as a gear box and other components of the pumping unit; the parking motor 24 is fixed to the outside of the box body 1701, the output shaft passes through the through hole of the box body 1701 and enters the inside of the box body 1701, and the part in the inside of the box body 1701 is designed as a screw rod 15; the parking slider 18 is square, is in sliding fit with the inner wall of the box body 1701, moves up and down along the inner wall of the box body 1701, is provided with a threaded hole at the top for threaded transmission connection with the screw rod 15, and is provided with an arc-shaped sliding groove 1801 coaxial with the brake wheel 21 at the bottom, and the cross section of the arc-shaped sliding groove 1801 is T-shaped; the parking tooth block 2819 has a T-shaped sliding rail at the top for sliding fit with the arc-shaped sliding groove 1801, has a toothed portion at the bottom for cooperation with the parking gear 20, and has a length shorter than the inner diameter of the box body 1701, so that the parking tooth block 2819 can move back and forth along the arc-shaped sliding groove 1801 in the box body 1701; the parking gear 20 is fixedly installed on the input shaft 22 coaxially with the brake wheel 21.

[0033] When the pumping unit is provided with the parking kit, electric control parking can be realized, and the principle is that the parking motor 24 drives the parking slider 18 to move downward through the threaded transmission cooperation of the screw rod 15 and the threaded hole, the parking slider 18 drives the parking tooth block 2819 to move downward, and then the parking gear is engaged with the parking gear 20 to realize the parking function.

[0034] Embodiment 3

[0035] The electric control part of the electric control brake modification assembly of the pumping unit is composed of an electric control box, a warning horn, an intelligent control PLC, an upper dead point sensing switch, a lower dead point sensing switch, a brake reversing controller, a parking reversing controller, a voice module, a brake state detection switch and a parking state detection switch.

[0036] The automatic control completes the pumping unit stop control process: after the local stop button is pressed or the remote stop instruction is sent, the intelligent control PLC enters the stop brake program, and waits for the inductive switch to sense that the pumping unit runs to the preset stop position, and then sends the instruction to stop the pumping unit motor. After the intelligent control PLC receives the pumping unit motor stop signal, the brake reversing controller is sent the brake tightening instruction, the electric push rod 8 is started to push the push plate backward, and the brake action is performed through the connecting rod 7, the connecting plate 10, the horizontal pull rod 11, the reversing mechanism, the vertical pull rod 13, the arm, and the brake shoe 23 holding the brake wheel 21. When the brake force is large enough, the brake reversing controller will monitor that the operating current of the electric push rod 8 reaches the preset value, so as to stop the operation of the electric push rod 8. The brake state detection switch transmits the brake process completion signal to the intelligent control PLC. At this time, the intelligent control PLC sends the instruction to the parking reversing controller to start the parking motor 24 in the forward direction. The parking motor 24 drives the screw rod 15 to rotate, and the rotation of the screw rod 15 is converted into the thrust of the sliding block through the threaded structure, and the parking gear block 28 19 is pushed into the tooth groove of the parking gear disc 20, so as to realize the parking function. After the operating current of the parking motor 24 reaches the preset peak value, the parking motor 24 stops. After the intelligent control PLC receives the parking state signal that the parking is completed, the parking program ends.

[0037] The automatic control completes the pumping unit stop control process: after the local stop button is pressed or the remote stop instruction is sent, the intelligent control PLC enters the stop brake program, and waits for the inductive switch to sense that the pumping unit runs to the preset stop position, and then sends the instruction to stop the pumping unit motor. After the intelligent control PLC receives the pumping unit motor stop signal, the brake reversing controller is sent the brake tightening instruction, the electric push rod 8 is started to push the push plate backward, and the brake action is performed through the connecting rod 7, the connecting plate 10, the horizontal pull rod 11, the reversing mechanism, the vertical pull rod 13, the arm, and the brake shoe 23 holding the brake wheel 21. When the brake force is large enough, the brake reversing controller will monitor that the operating current of the electric push rod 8 reaches the preset value, so as to stop the operation of the electric push rod 8. The brake state detection switch transmits the brake process completion signal to the intelligent control PLC. At this time, the intelligent control PLC sends the instruction to the parking reversing controller to start the parking motor 24 in the forward direction. The parking motor 24 drives the screw rod 15 to rotate, and the rotation of the screw rod 15 is converted into the thrust of the sliding block through the threaded structure, and the parking gear block 28 19 is pushed into the tooth groove of the parking gear disc 20, so as to realize the parking function. After the operating current of the parking motor 24 reaches the preset peak value, the parking motor 24 stops. After the intelligent control PLC receives the parking state signal that the parking is completed, the parking program ends.

[0038] The above-mentioned electric control part can be designed according to the mechanical structure of embodiments one and two according to the needs, which is an application expansion of the present application, and does not require additional creative labor of the person skilled in the art.

[0039] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An electric control retrofitting assembly for a pumping unit brake, which is suitable for a beam-type pumping unit brake system with a hand brake mechanism and a band brake mechanism, the hand brake mechanism comprising a bracket, a hand brake body, a hand brake handle, a cross rod and a reversing mechanism, the band brake mechanism comprising a brake wheel, a brake shoe and a small rod, characterized in that, The application relates to an electric control brake set and an electric control parking set.

2. The electrically controlled retrofit brake assembly for a pumping unit as recited in claim 1, wherein, Parallel sliding grooves are arranged on the side of the box, and sliding steps are arranged on the two sides of the transverse sliding block and are in sliding cooperation with the parallel sliding grooves.

3. The electrically controlled retrofit brake assembly for a pumping unit as recited in claim 1, wherein, A reset spring is arranged on the connecting rod.

4. The electrically controlled retrofit brake assembly for a pumping unit as recited in claim 1, wherein, The mounting base comprises a box body and a mounting plate, a through hole is arranged at the bottom of the box body and is used for allowing the output shaft of the parking motor to pass through, and a mounting hole is arranged on the mounting plate.

5. The electrically controlled retrofit brake assembly for a pumping unit as defined in claim 4, wherein, A threaded hole is arranged at the top of the parking sliding block and is in threaded transmission connection with a screw rod on the output shaft of the parking motor.

6. The electrically controlled retrofit brake assembly for a pumping unit as defined in claim 4, wherein, An arc-shaped sliding groove is arranged at the bottom of the parking sliding block, and a T-shaped sliding rail is arranged at the top of the parking tooth block and is in sliding cooperation with the arc-shaped sliding groove.

7. The electrically controlled retrofit brake assembly for a pumping unit as defined in claim 1, wherein, An electric control box is further arranged, and a smart control PLC, a brake reversing controller and a parking reversing controller are arranged in the electric control box.

8. The electrically controlled retrofit brake assembly for a pumping unit as defined in claim 7, wherein, A top dead point sensing switch and a bottom dead point sensing switch are further arranged and are used for sensing the running position of the pumping unit.

9. The electrically controlled retrofit brake assembly for a pumping unit as defined in claim 7, wherein, A brake state detection switch and a parking state detection switch are further arranged.

10. The electrically controlled retrofit brake assembly for a pumping unit as defined in claim 7, wherein, A voice module and an alarm horn are further arranged.

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