A beam pumping unit with multiple braking effects

Abstract

The invention discloses a beam pumping unit with multiple braking effects, belongs to the technical field of pumping units, and is particularly a beam pumping unit with multiple braking effects, comprising a base, wherein a gearbox is installed on the top of the base. The invention provides a support plate, a moving seat, a moving block, a guide rod, a moving rod, a sliding block, a limiting rod, a bent plate, a brake block, a friction ring, a connecting plate, a clamping plate, a tooth block, a limiting gear ring and a spring, and uses a hydraulic cylinder to drive the moving block to move downward. At this time, under the cooperation of the guide rod, the limiting rod and the bent plate, the moving block that moves downward can drive two brake blocks to move downward and fit closely with the friction ring, thereby realizing the braking operation of the pumping unit, and when the brake shaft of the pumping unit is braking, two automatically reset clamping plates will drive the tooth block to move to the middle position at the same time and clamp it on the limiting gear ring fixed on the surface of the brake shaft, and at this time, the brake shaft can be further limited.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, in particular to a walking beam type oil pumping unit with multiple braking effects. Background Art

[0002] A beam pumping unit is one of the main types of pumping units currently used in oil fields. It mainly consists of four parts: a walking beam, a connecting rod, a crank mechanism, a gearbox, a power device, and auxiliary equipment. During operation, the transmission of the electric motor is converted into the up and down movement of the walking beam through the gearbox and the crank-connecting rod mechanism. The walking beam drives the plunger of the downhole pump to move up and down through the polished rod and the sucker rod, thereby continuously pumping crude oil out of the wellbore. The brake device used in the walking beam pumping unit is usually an external brake device, which mainly includes a brake wheel, a brake hoop, and a brake friction pad. However, during the use of the external brake device of the current walking beam pumping unit, due to wear of the brake friction pad, mechanical failure, or human error, the walking beam pumping unit may sometimes experience brake failure and slip. Since the walking beam pumping unit is usually repaired when it is stopped, the personal safety of the maintenance personnel may be affected after the slip occurs. Therefore, a walking beam pumping unit with multiple braking effects is proposed to solve the above problem. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides a beam pumping unit with multiple braking effects, which solves the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0005] A walking beam pumping unit with multiple braking effects comprises a base, a gearbox is installed on the top of the base, a walking beam is arranged above the gearbox, a donkey head is fixed to one end of the walking beam, a bearing bracket for supporting the walking beam is fixed to the top of the base, the walking beam and the bearing bracket are rotatably connected by a pin shaft, a transmission shaft and a brake shaft are rotatably connected to the gearbox through a bearing, two cranks are fixed on the surface of the transmission shaft, one side wall of the crank is rotatably connected to a connecting rod through a pin shaft, the bottom of the walking beam is rotatably connected to a cross beam through a pin shaft, and the connecting The other ends of the connecting rods are rotatably connected to the crossbeams through pins. A motor for driving the brake shaft to rotate is provided on the top of the base. A transmission wheel fixed on the surface of the motor output shaft is connected to a pulley fixed on the surface of the brake shaft through a belt. A support plate fixed to one side wall of the gearbox is provided below the brake shaft. A hydraulic cylinder is fixed on the top of the support plate. A moving seat is fixed on the ejection end of the hydraulic cylinder. A moving block is fixed on the top of the moving seat. Two guide rods for guiding the moving block are fixed on the top of the support plate. The moving block slides on the two guide rods The top of each sliding block is fixed with a bent plate, and the top inner wall of each bent plate is fixed with a brake block. A friction ring used in conjunction with the brake block is fixed on the surface of the brake shaft. Two L-shaped plates fixed to one side wall of the gearbox are provided on both sides of the brake shaft, and the inner wall of one side of the L-shaped plate is fixed with a connecting rod. A connecting plate, two card plates are arranged between the two connecting plates, one side wall of the card plate is fixed with a tooth block, the surface of the brake shaft is fixed with a limiting gear ring used in conjunction with the two tooth blocks, one side wall of the connecting plate is fixed with two springs for facilitating the extension and contraction of the card plate, the other ends of the springs are fixedly connected to the corresponding card plates, one side inner wall of the L-shaped plate is provided with a deceleration assembly for delaying the resetting of the card plate, the opposite side walls of the two card plates are fixed with a matching block, and one side wall of the moving block is fixed with an extrusion block adapted to the matching block, and the matching blocks are all in contact with the extrusion block.

[0006] Furthermore, the deceleration assembly includes a first rotating shaft and a second rotating shaft rotatably connected to the inner wall of one side of the L-shaped plate through a bearing, a reduction gear is fixed to the surface of the first rotating shaft, a transmission gear is fixed to the surface of the second rotating shaft, the transmission gear is meshed with the reduction gear, a circular plate is fixed to one end of the second rotating shaft, a T-shaped shaft is fixed to one side wall of the circular plate, a transmission rod is movably connected to the surface of the T-shaped shaft, and the other end of the transmission rod is rotatably connected to a side wall of one of the clamping plates through a pin shaft.

[0007] Furthermore, a rubber plate is fixed to an inner wall of one side of the L-shaped plate, and tooth grooves adapted to the reduction gear are equidistantly formed on one side wall of the rubber plate, and the reduction gear is meshedly connected to the rubber plate.

[0008] Furthermore, one end of the T-shaped shaft is eccentrically fixed to a side wall of the circular plate, and the T-shaped shaft is rotatably connected to the transmission rod.

[0009] Furthermore, a stopper is fixed to the top end of each guide rod, and each stopper is fixed to the outer wall of the gearbox.

[0010] Furthermore, the two through holes opened in the side walls of the two connecting plates are slidably connected to the inside of cross bars for auxiliary support of the card plates, one end of the cross bars is fixedly connected to the corresponding card plates, and the other end of the cross bars slides through the corresponding L-shaped plates and extends to one side thereof, and a baffle is fixed at one end of the two cross bars on the same side.

[0011] Furthermore, the two matching blocks are in the shape of a triangle, and the shape of the extrusion block is a trapezoid.

[0012] Furthermore, both brake pads are ceramic brake pads.

[0013] A beam pumping unit with multiple braking effects comprises the following steps:

[0014] S1: The brake shaft is driven by a driving motor to rotate. With the cooperation of the internal components of the gearbox, the rotation of the brake shaft can also drive the transmission shaft on one side to rotate. When the transmission shaft rotates, it drives the crank to rotate. Since the rocker arm and the bearing bracket are rotationally connected, and with the cooperation of the connecting rod, the crank can drive the crossbeam to move up and down when it rotates. Because the crossbeam is rotationally connected to the rocker arm through a pin shaft, the two ends of the rocker arm can be driven to swing up and down. Therefore, when one end of the rocker arm moves, it can drive the donkey head to move up and down to extract the oil.

[0015] S2: When the brake shaft needs to be braked, the hydraulic cylinder is started to drive the extended ejector end to retract. When the ejector end retracts, the moving block can be driven downward by the moving seat. After the moving block moves downward, with the cooperation of the two guide rods and the two limit rods, the two sliding blocks can move downward and approach the middle position. When the two sliding blocks move downward, they will respectively drive the bent plates downward. Then, when the two bent plates move downward, they will respectively drive the brake blocks downward. Finally, when the two brake blocks are tightly fitted with the friction ring on the brake shaft, the brake shaft can be stopped.

[0016] S3: As the moving block drives the extrusion block downward as it moves downward, when the extrusion block releases the restriction on the two matching blocks after moving downward, the compressed springs fixed on one side of the two connecting plates will reset at the same time. Under the reset force of the springs on both sides, the two clamping plates can be driven to move to the middle position at the same time. Then the moved clamping plates will respectively drive the tooth blocks to be inserted into the card slots of the limit gear ring, so that the brake shaft can be limited again.

[0017] Compared with the prior art, the present invention provides a beam pumping unit with multiple braking effects, which has the following beneficial effects:

[0018] The present invention provides a support plate, a movable seat, a movable block, a guide rod, a movable rod, a sliding block, a limit rod, a bent plate, a brake block, a friction ring, a connecting plate, a clamping plate, a tooth block, a limit gear ring and a spring, and utilizes the provided hydraulic cylinder to drive the movable block to move downward. At this time, with the cooperation of the guide rod, the limit rod and the bent plate and other components, the downward moving block can drive the two brake blocks to move downward and fit tightly with the friction ring, thereby realizing the braking operation of the oil pump. When the brake shaft of the oil pump is braking, the two automatically reset clamping plates will drive the tooth blocks to move to the middle position at the same time and be clamped on the limit gear ring fixed on the surface of the brake shaft. At this time, the brake shaft can be further limited, thereby avoiding the situation of slipping after the brake failure of the oil pump, and ensuring the personal safety of the maintenance personnel.

[0019] The present invention provides a deceleration component so that when the oil pump is braking, the deceleration component can delay the reset speed of the gear blocks on both sides of the limit gear ring, so that after the two brake blocks brake the brake shaft, the gear blocks on both sides will move to limit the limit gear ring, thereby avoiding the situation where the gear blocks are damaged due to the synchronous movement of the gear blocks and the brake blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention from a first viewing angle;

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention from a second viewing angle;

[0022] Figure 3 For the present invention Figure 2 A schematic diagram of the structure at center A;

[0023] Figure 4 This is a schematic diagram of the top structure of the support plate of the present invention from a first perspective;

[0024] Figure 5 This is a schematic diagram of the top structure of the support plate of the present invention from a second viewing angle;

[0025] Figure 6This is a schematic diagram of the L-shaped plate structure of the present invention.

[0026] In the figure: 1. Base; 2. Gearbox; 3. Walking beam; 4. Donkey head; 5. Load-bearing bracket; 6. Transmission shaft; 7. Brake shaft; 8. Crank; 9. Connecting rod; 10. Crossbeam; 11. Motor; 12. Support plate; 13. Hydraulic cylinder; 14. Moving seat; 15. Moving block; 16. Guide rod; 17. Moving rod; 18. Sliding block; 19. Limit rod; 20. Bending plate; 21. Brake block; 22. Friction ring; 23. L-shaped plate; 24 , connecting plate; 25, clamping plate; 26, tooth block; 27, limiting gear ring; 28, spring; 29, reduction assembly; 2901, first rotating shaft; 2902, second rotating shaft; 2903, reduction gear; 2904, transmission gear; 2905, circular plate; 2906, T-shaped shaft; 2907, transmission rod; 30, matching block; 31, extrusion block; 32, rubber plate; 33, tooth groove; 34, block; 35, cross bar; 36, baffle. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0028] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, an embodiment of the present invention proposes a walking beam type oil pumping unit with multiple braking effects, including a base 1, a gearbox 2 is installed on the top of the base 1, a walking beam 3 is arranged above the gearbox 2, a donkey head 4 is fixed to one end of the walking beam 3, a bearing bracket 5 for supporting the walking beam 3 is fixed on the top of the base 1, the walking beam 3 and the bearing bracket 5 are rotatably connected by a pin shaft, a transmission shaft 6 and a brake shaft 7 are rotatably connected to the gearbox 2 through a bearing, two cranks 8 are fixed on the surface of the transmission shaft 6, and one side wall of the crank 8 is rotatably connected to a connecting rod 9 through a pin shaft, the bottom of the walking beam 3 is rotatably connected to a cross beam 10 through a pin shaft, and the other end of the connecting rod 9 is rotatably connected to the cross beam 10 through a pin shaft, and a support for driving the brake shaft 7 to move is provided on the top of the base 1. The motor 11 rotates, and the transmission wheel fixed on the output shaft surface of the motor 11 is connected to the pulley fixed on the surface of the brake shaft 7 through a belt. A support plate 12 fixed to the side wall of the gearbox 2 is provided below the brake shaft 7. A hydraulic cylinder 13 is fixed on the top of the support plate 12. The ejection end of the hydraulic cylinder 13 is in an extended state in the figure, and a moving seat 14 is fixed to the ejection end of the hydraulic cylinder 13. A moving block 15 is fixed to the top of the moving seat 14. Two guide rods 16 for guiding the moving block 15 are fixed on the top of the support plate 12. The tops of the guide rods 16 are fixed with blocks 34. The blocks 34 are all fixed to the outer wall of the gearbox 2. The set blocks 34 can be used to limit the maximum distance of the moving block 15 to move upward, thereby preventing it from sliding upward. After that, it will be separated from the guide rod 16, and the moving block 15 slides on the surface of the two guide rods 16. A moving rod 17 is fixed inside the through hole opened in the side wall of the moving block 15. The surface of the moving rod 17 is slidably connected with two sliding blocks 18. Two limit rods 19 for guiding the sliding blocks 18 are fixed on the top of the support plate 12. The sliding blocks 18 slide on the surfaces of the corresponding limit rods 19 respectively. A bent plate 20 is fixed on the top of the sliding block 18, and a brake block 21 is fixed on the top inner wall of the bent plate 20. The two brake blocks 21 are ceramic brake pads. Ceramic brake pads are mainly composed of mineral fiber, aramid fiber and ceramic fiber, which have a stable friction coefficient, good mechanical strength and physical properties, and very low thermal attenuation. Therefore, when the brakes After the block 21 is made of ceramic brake pads, the safety and service life of the brake block 21 can be improved. A friction ring 22 used in conjunction with the brake block 21 is fixed to the surface of the brake shaft 7. Two L-shaped plates 23 fixed to one side wall of the gearbox 2 are provided on both sides of the brake shaft 7. A connecting plate 24 is fixed to the inner wall of one side of the L-shaped plate 23. Two clamping plates 25 are provided between the two connecting plates 24. A tooth block 26 is fixed to one side wall of the clamping plate 25. A limiting gear ring 27 used in conjunction with the two tooth blocks 26 is fixed to the surface of the brake shaft 7. Two springs 28 for facilitating the expansion and contraction of the clamping plate 25 are fixed to one side wall of the connecting plate 24. In the figure, the springs 28 are all in a compressed state, and the other ends of the springs 28 are fixedly connected to the corresponding clamping plates 25.The inner wall of one side of the L-shaped plate 23 is provided with a deceleration assembly 29 for delaying the reset of the card plate 25. The opposite side walls of the two card plates 25 are fixed with a matching block 30. The side wall of the movable block 15 is fixed with an extrusion block 31 that matches the matching block 30. The matching blocks 30 are both in abutment with the extrusion block 31. The two matching blocks 30 are triangular in shape, and the extrusion block 31 is trapezoidal in shape. After the two matching blocks 30 are set to a shape that matches the extrusion block 31, the extrusion block 31 and the matching blocks 30 are separated, and the two can be easily reset and fitted together later.

[0029] like Figure 5 and Figure 6 As shown, in some embodiments, the reduction assembly 29 includes a first rotating shaft 2901 and a second rotating shaft 2902 that are rotatably connected to the inner wall of one side of the L-shaped plate 23 through a bearing. A reduction gear 2903 is fixed to the surface of the first rotating shaft 2901, and a transmission gear 2904 is fixed to the surface of the second rotating shaft 2902. The transmission gear 2904 is meshed with the reduction gear 2903. A circular plate 2905 is fixed to one end of the second rotating shaft 2902. One side of the circular plate 2905 is fixed to the first rotating shaft 2901. A T-shaped shaft 2906 is fixed to the wall, and a transmission rod 2907 is movably connected to the surface of the T-shaped shaft 2906. One end of the T-shaped shaft 2906 is eccentrically fixed to a side wall of the circular plate 2905, and the T-shaped shaft 2906 is rotatably connected to the transmission rod 2907. The T-shaped shaft 2906 and the circular plate 2905 are eccentrically fixed so that when the circular plate 2905 rotates, the transmission rod 2907 can be pushed to move, and the T-shaped shaft 2906 and the transmission rod 2907 are rotatably connected to When the card plate 25 moves, the circular plate 2905 is driven to rotate by the transmission rod 2907. Since the circular plate 2905 is fixed to one end of the second rotating shaft 2902, the transmission gear 2904 can be driven to rotate when the circular plate 2905 rotates. Since the reduction gear 2903 fixed on the first rotating shaft 2901 is meshed with the transmission gear 2904, the circular plate 2905 can also drive the reduction gear 2903 to rotate when the circular plate 2905 drives the transmission gear 2904. By utilizing the principle of gear transmission ratio, when the transmission gear 2904 drives the reduction gear 2903 to rotate, its speed will slow down, thereby achieving the effect of delaying the reset speed of the card plate 25.

[0030] like Figure 6As shown, in some embodiments, a rubber plate 32 is fixed to the inner wall of one side of the L-shaped plate 23. Since the rubber plate 32 itself is elastic, when the tooth grooves 33 provided on the rubber plate 32 engage with the reduction gear 2903, the reduction gear 2903 itself will not be unable to rotate. The tooth grooves 33 adapted to the reduction gear 2903 are equidistantly provided on one side wall of the rubber plate 32, and the reduction gear 2903 is meshed and connected with the rubber plate 32. By further providing the rubber plate 32 on the inner wall of one side of the L-shaped plate 23, the tooth grooves 33 provided thereon engage with the reduction gear 2903, thereby increasing the resistance of the reduction gear 2903 during rotation, thereby further enhancing the overall deceleration effect of the reduction assembly 29.

[0031] like Figure 4 and Figure 5 As shown, in some embodiments, the two through holes opened in the side walls of the two connecting plates 24 are slidably connected with cross bars 35 for auxiliary support of the card plate 25, one end of the cross bar 35 is fixedly connected to the corresponding card plate 25, and the other end of the cross bar 35 slides through the corresponding L-shaped plate 23 and extends to one side thereof, and a baffle 36 is fixed at one end of the two cross bars 35 on the same side. The set cross bars 35 can respectively play the role of auxiliary support for the corresponding card plate 25, so as to enhance the limiting effect of the tooth block 26 on the limiting gear ring 27.

[0032] A beam pumping unit with multiple braking effects comprises the following steps:

[0033] S1: The brake shaft 7 is driven to rotate by the driving motor 11. With the cooperation of the internal components of the gearbox 2, the rotation of the brake shaft 7 can drive the transmission shaft 6 on one side to rotate. When the transmission shaft 6 rotates, the crank 8 is driven to rotate. Since the rocker 3 and the supporting bracket 5 are rotationally connected, and with the cooperation of the connecting rod 9, the crank 8 can drive the crossbeam 10 to move up and down when it rotates. Since the crossbeam 10 is rotationally connected to the rocker 3 through a pin shaft, the two ends of the rocker 3 can be driven to swing up and down. Therefore, when one end of the rocker 3 moves, it can drive the donkey head 4 to move up and down to extract the oil.

[0034] S2: When the brake shaft 7 needs to be braked, the hydraulic cylinder 13 is started to drive the extended ejection end thereof to retract. When the ejection end thereof retracts, the movable block 15 can be driven downward by the movable seat 14. After the movable block 15 moves downward, with the cooperation of the two guide rods 16 and the two limit rods 19, the two sliding blocks 18 can be moved downward and approached to the middle position at the same time. When the two sliding blocks 18 move downward, they respectively drive the bent plates 20 to move downward. Then, when the two bent plates 20 move downward, they respectively drive the brake blocks 21 to move downward. Finally, when the two brake blocks 21 are tightly fitted with the friction rings 22 on the brake shaft 7, the brake shaft 7 can be stopped.

[0035] S3: Since the moving block 15 will drive the extrusion block 31 to move downward while moving downward, when the extrusion block 31 that has moved downward releases the restriction on the two matching blocks 30, the compressed springs 28 fixed on one side of the two connecting plates 24 will be reset at the same time. Under the reset force of the springs 28 on both sides, the two clamping plates 25 can be driven to move to the middle position at the same time. Then the moved clamping plates 25 will respectively drive the tooth blocks 26 to be inserted into the clamping grooves of the limiting gear ring 27, so that the limiting operation of the brake shaft 7 can be realized again.

[0036] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A beam pumping unit with multiple braking effects, comprising a base (1), characterized in that: A gearbox (2) is installed on the top of the base (1), a walking beam (3) is arranged above the gearbox (2), a donkey head (4) is fixed to one end of the walking beam (3), a bearing bracket (5) for supporting the walking beam (3) is fixed to the top of the base (1), the walking beam (3) and the bearing bracket (5) are rotatably connected via a pin shaft, a transmission shaft (6) and a brake shaft (7) are rotatably connected to the gearbox (2) via a bearing, two cranks (8) are fixed to the surface of the transmission shaft (6), one side wall of the crank (8) is rotatably connected to a connecting rod (9) via a pin shaft, the bottom of the walking beam (3) is rotatably connected to a cross beam (10) via a pin shaft, and the other end of the connecting rod (9) is connected to the cross beam (10) via a pin shaft. 0) is rotatably connected, a motor (11) is arranged on the top of the base (1) for driving the brake shaft (7) to rotate, a transmission wheel fixed on the output shaft surface of the motor (11) is connected to the pulley fixed on the surface of the brake shaft (7) through a belt, a support plate (12) is arranged below the brake shaft (7) and is fixed to a side wall of the gearbox (2), a hydraulic cylinder (13) is fixed on the top of the support plate (12), a moving seat (14) is fixed on the ejection end of the hydraulic cylinder (13), a moving block (15) is fixed on the top of the moving seat (14), two guide rods (16) for guiding the moving block (15) are fixed on the top of the support plate (12), and the moving block (15) slides on the two guide rods (1 6), a moving rod (17) is fixed inside a through hole provided in a side wall of the moving block (15), the surface of the moving rod (17) is slidably connected to two sliding blocks (18), the top of the support plate (12) is fixed with two limit rods (19) for guiding the sliding blocks (18), the sliding blocks (18) slide on the surfaces of the corresponding limit rods (19), the top of each sliding block (18) is fixed with a bent plate (20), the top inner wall of each bent plate (20) is fixed with a brake block (21), the surface of the brake shaft (7) is fixed with a friction ring (22) for use with the brake block (21), and two L-shaped plates (21) fixed to one side wall of the gearbox (2) are provided on both sides of the brake shaft (7). 23), a connecting plate (24) is fixed to the inner wall of one side of the L-shaped plate (23), two clamping plates (25) are arranged between the two connecting plates (24), a tooth block (26) is fixed to one side wall of the clamping plate (25), a limiting gear ring (27) used in conjunction with the two tooth blocks (26) is fixed to the surface of the brake shaft (7), two springs (28) are fixed to one side wall of the connecting plate (24) for facilitating the expansion and contraction of the clamping plate (25), the other ends of the springs (28) are respectively fixedly connected to the corresponding clamping plates (25), a deceleration component (29) for delaying the resetting of the clamping plate (25) is arranged on the inner wall of one side of the L-shaped plate (23), and a matching block (30) is fixed to the opposite side walls of the two clamping plates (25),A squeezing block (31) adapted to the matching block (30) is fixed to one side wall of the moving block (15), and the matching block (30) is in close contact with the squeezing block (31).

2. A beam pumping unit with multiple braking effects according to claim 1, characterized in that: The reduction assembly (29) comprises a first rotating shaft (2901) and a second rotating shaft (2902) which are rotatably connected to an inner wall of one side of the L-shaped plate (23) via a bearing; a reduction gear (2903) is fixed to the surface of the first rotating shaft (2901); a transmission gear (2904) is fixed to the surface of the second rotating shaft (2902); the transmission gear (2904) is meshingly connected to the reduction gear (2903); a circular plate (2905) is fixed to one end of the second rotating shaft (2902); a T-shaped shaft (2906) is fixed to one side wall of the circular plate (2905); a transmission rod (2907) is movably connected to the surface of the T-shaped shaft (2906); and the other end of the transmission rod (2907) is rotatably connected to a side wall of one of the clamping plates (25) via a pin.

3. A beam pumping unit with multiple braking effects according to claim 2, characterized in that: A rubber plate (32) is fixed to an inner wall of one side of the L-shaped plate (23), and tooth grooves (33) matching the reduction gear (2903) are formed at equal intervals on a side wall of the rubber plate (32), and the reduction gear (2903) is meshingly connected to the rubber plate (32).

4. A beam pumping unit with multiple braking effects according to claim 2, characterized in that: One end of the T-shaped shaft (2906) is eccentrically fixed to a side wall of the circular plate (2905), and the T-shaped shaft (2906) is rotatably connected to the transmission rod (2907).

5. The beam pumping unit with multiple braking effects according to claim 1, characterized in that: A stopper (34) is fixed to the top end of each guide rod (16), and each stopper (34) is fixed to the outer wall of the gearbox (2).

6. The beam pumping unit with multiple braking effects according to claim 1, characterized in that: Two through holes formed in the side walls of the two connecting plates (24) are slidably connected to a cross bar (35) for auxiliary support of the card plate (25), one end of the cross bar (35) is fixedly connected to the corresponding card plate (25), the other end of the cross bar (35) slides through the corresponding L-shaped plate (23) and extends to one side thereof, and a baffle (36) is fixed to one end of the two cross bars (35) on the same side.

7. The beam pumping unit with multiple braking effects according to claim 1, characterized in that: The two matching blocks (30) are in the shape of a triangle, and the extrusion block (31) is in the shape of a trapezoid.

8. The beam pumping unit with multiple braking effects according to claim 1, characterized in that: Both brake blocks (21) are ceramic brake pads.

9. A beam pumping unit with multiple braking effects according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: The brake shaft (7) is driven to rotate by the driving motor (11). With the cooperation of the internal components of the gearbox (2), the brake shaft (7) can be rotated and the transmission shaft (6) on one side thereof can be driven to rotate. When the transmission shaft (6) rotates, the crank (8) is driven to rotate. Since the rocker (3) and the bearing bracket (5) are rotationally connected, and with the cooperation of the connecting rod (9), the crank (8) can drive the crossbeam (10) to move up and down when it rotates. Since the crossbeam (10) is rotationally connected to the rocker (3) through a pin shaft, the two ends of the rocker (3) can be driven to swing up and down. Therefore, when one end of the rocker (3) moves, it can drive the donkey head (4) to move up and down to extract oil. S2: When the brake shaft (7) needs to be braked, the hydraulic cylinder (13) is started to drive the extended ejection end thereof to retract. When the ejection end thereof retracts, the movable block (15) can be driven to move downward through the movable seat (14). After the movable block (15) moves downward, with the cooperation of the two guide rods (16) and the two limit rods (19), the two sliding blocks (18) can move downward and approach the middle position at the same time. When the two sliding blocks (18) move downward, they respectively drive the bent plates (20) to move downward. Then, when the two bent plates (20) move downward, they respectively drive the brake blocks (21) to move downward. Finally, when the two brake blocks (21) are tightly fitted with the friction ring (22) on the brake shaft (7), the brake shaft (7) can be braked to a stop. S3: As the moving block (15) moves downward, it drives the extrusion block (31) to move downward. When the extrusion block (31) moves downward and releases the restriction on the two matching blocks (30), the compressed springs (28) fixed on one side of the two connecting plates (24) will be reset at the same time. Under the reset force of the springs (28) on both sides, the two clamping plates (25) can be driven to move to the middle position at the same time. Then, the moved clamping plates (25) will respectively drive the tooth blocks (26) to be inserted into the clamping grooves of the limiting gear ring (27), so that the brake shaft (7) can be limited again.

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