An electronically controlled brake device for a beam pumping unit

Abstract

The present invention relates to the field of oilfield auxiliary production, and in particular to an electronically controlled brake device for a beam pumping unit. The device comprises a bottom plate, the bottom plate is slidably connected to a symmetrically distributed sliding member, the sliding member is fixedly connected to a brake disc through a driving shaft, the sliding member is provided with a brake mechanism for stopping the beam pumping unit, the brake mechanism comprises a first annular ring, the first annular ring is fixedly connected to the sliding member, a first cavity is provided in the first annular ring, the first cavity is filled with hydraulic oil for transmitting power, the first annular ring is provided with a buffer mechanism, and the sliding member is symmetrically provided with a locking mechanism. The resistance of the brake disc is controlled by the resistance of the hydraulic oil flowing in the buffer mechanism, the change of the brake disc braking speed in the initial stage of braking is reduced, and the driving shaft is prevented from being overloaded and damaged due to a too short braking process. The brake disc is locked when it stops through the locking mechanism, the stability of the pumping unit during the maintenance process is improved, and safety protection is provided for the staff during subsequent maintenance.

Description

Technical Field

[0001] The present invention relates to the field of oilfield auxiliary production, and in particular to an electronically controlled brake device for a beam pumping unit. Background Art

[0002] The walking beam pumping unit is one of the main types of pumping units currently used in oil fields. It is mainly composed of four parts: a donkey head-walking beam-connecting rod-crank mechanism, a reduction gear box, a power device and auxiliary equipment. When working, the rotation of the motor is converted into the up and down movement of the donkey head through the gearbox and the crank-connecting rod mechanism. The donkey head drives the plunger of the downhole oil pump to move up and down through the bare rod and the sucker rod, thereby continuously pumping the crude oil in the well out of the wellbore.

[0003] Since the beam pumping unit works around the clock and in all weather conditions, it needs to be inspected and maintained at regular intervals to ensure its normal operation in various harsh environments. During the inspection and maintenance, it needs to be braked and fixed using a brake device. Existing devices rely solely on friction braking during braking, which will increase the wear of brake parts. During braking, the power output shaft is easily overloaded due to the large speed change in the initial stage of braking, resulting in the breakage of the power output shaft. In addition, most existing devices only perform friction fixation and simple limit fixation on the power output shaft of the beam pumping unit. When the beam pumping unit is shut down for inspection and maintenance, there is a lack of response to abnormal movement of the beam pumping unit. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the above background technology, the present invention provides an electronically controlled brake device of a beam pumping unit with a locking function.

[0005] The technical solution of the present invention is as follows: an electronically controlled brake device for a walking beam pumping unit, comprising a base plate, a sliding member slidably connected to the base plate with symmetrically distributed sliding members, a driving motor installed on the base plate, an output shaft of the driving motor fixedly connected to a lead screw, the lead screw and the sliding member are threadedly connected, a driving shaft is arranged between the sliding members, a brake disc is fixedly connected to the driving shaft, and also comprises a brake mechanism symmetrically arranged for stopping the walking beam pumping unit, the brake mechanism is respectively arranged on both sides of the brake disc, the brake mechanism comprises a first ring, the first ring is fixedly connected to the sliding member, a first cavity is arranged in the first ring, the first cavity is filled with hydraulic oil for transmitting power, the first ring is provided with a circumferentially distributed first through hole, the first through hole is communicated with the first cavity, the first through hole is connected to the first cavity, and the first through hole is connected to the first cavity. A circular ring is fixed to the sliding part, the first circular ring is slidably connected to the piston rod, the piston rod is fixed to the first intermediate circular ring through the intermediate fixed rod, the first intermediate circular ring is provided with a circumferentially distributed first air storage cavity, the first air storage cavity is filled with inert gas, the first intermediate circular ring is slidably connected to the first brake pad, the first brake pad is circumferentially provided with a first sliding rod, the first sliding rod slides in the adjacent first air storage cavity, the first circular ring is provided with a buffer mechanism for reducing the speed change of the brake disc in the initial stage of braking, the symmetrical sliding parts are symmetrically provided with a locking mechanism for limiting the brake disc, the rotation speed of the first brake pad is slowed down by the resistance when the piston rod squeezes the hydraulic oil in the first cavity, and then the rotation speed of the brake disc is slowed down.

[0006] Further explanation: the edge of the brake disc is provided with circumferentially distributed slots, which are used to limit the brake disc.

[0007] Further explanation: the buffer mechanism includes a second ring, which is fixed to the first ring, and a second cavity is provided in the second ring, and the second cavity is filled with hydraulic oil for transmitting power. The second ring is provided with a circumferentially distributed second through hole, and the second through hole is communicated with the second cavity. The first cavity and the second cavity are connected through the first through hole and the second through hole. The second ring is fixed with a circumferentially distributed intermediate tube, and the intermediate tube is communicated with the second cavity. The intermediate tube is close to the second ring and is slidably connected to the first piston and the second piston in sequence from one side to the other side, and an inert gas is provided between the first piston and the second piston.

[0008] Further explanation: a first elastic element is fixed between the second piston and the side of the intermediate tube away from the second ring; a second intermediate ring is fixed to the side of the second piston away from the second ring; the second intermediate ring is provided with a circumferentially distributed second air storage cavity; the second air storage cavity is filled with an inert gas; the second intermediate ring is slidably connected to the second brake pad; the second brake pad is provided with a circumferentially distributed second slide rod; the second slide rod slides in the adjacent second air storage cavity.

[0009] It is further explained that the first brake pad and the second brake pad are both configured to have a rough surface on one side close to the brake disc, and the rough surfaces of the first brake pad and the second brake pad are used to increase the friction between the first brake pad and the second brake pad and the brake disc.

[0010] Further explanation: the locking mechanism includes symmetrically distributed fixed blocks, which are symmetrically fixed to adjacent sliding parts, and the fixed blocks are fixed with a first limit rod, and a T-shaped block is symmetrically connected to the sliding limit connection between the first limit rods, and the T-shaped block is provided with a symmetrical limit groove, which consists of a straight groove and an oblique groove connected end to end, and the symmetrical limit grooves are respectively limited and matched with the adjacent first limit rods, and the T-shaped block is rotatably connected to a rotating shaft, and the rotating shaft is fixed with a symmetrical rotating rod, and a second elastic element is fixed between the T-shaped block and the rotating rod, and a self-adjusting slider is slidably connected to the rotating rod, and a third elastic element is fixed between the self-adjusting slider and the rotating rod, and a locking block is rotatably connected between the symmetrical self-adjusting sliders, and the locking block is limited and matched with the slot of the brake disc, and the T-shaped block is fixed with a T-shaped baffle that limits the rotation range of the rotating rod.

[0011] It is further explained that the first limiting rod, the rotating shaft and the locking block are all heat-treated, and the heat treatment is used to increase the service life of the three.

[0012] Further explanation, it also includes an emergency mechanism for limiting the driving shaft, the emergency mechanism is arranged on the base plate, the emergency mechanism includes a bracket, the bracket is fixed to the base plate, the bracket is rotatably connected to a turn block, the turn block is provided with circumferentially distributed limiting holes, the bracket is fixed with a circumferentially distributed L-shaped plate, the L-shaped plate is slidably connected to a limiting slide rod that cooperates with the adjacent limiting holes on the turn block, the limiting slide rod is fixed with a retaining ring, a fourth elastic element is fixed between the retaining ring and the L-shaped plate, the turn block is slidably connected to a clamping block, the clamping block is fixed with a circumferentially distributed second limiting rod, a fifth elastic element is fixed between the clamping block and the turn block, the turn block is threadedly connected to a turn sleeve, the turn sleeve is provided with circumferentially distributed right-angled trapezoidal notches, and a square groove that cooperates with the clamping block is provided at one end of the driving shaft close to the turn block.

[0013] To further illustrate, the rotating sleeve is provided with circumferentially distributed arc grooves, and a circumferentially distributed L-shaped rod is fixedly connected to the side of the second ring close to the rotating sleeve, and the L-shaped rod is limitedly matched with the adjacent arc grooves on the rotating sleeve.

[0014] Further explanation: the bracket is slidably connected to a swivel, the swivel is provided with circumferentially distributed arc-shaped limit grooves, the swivel is fixed with a handle, and the retaining ring is fixed with a short rod that cooperates with the adjacent arc-shaped limit grooves on the swivel.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The brake disc is first braked by pre-contacting the first brake pad with the brake disc, and the first intermediate ring continues to move to the left. The first slide rod of the first brake pad begins to squeeze the inert gas in the first air storage cavity of the first intermediate ring. The compressed inert gas squeezes the first brake pad, thereby increasing the friction between the first brake pad and the brake disc, thereby slowing down the rotation speed of the brake disc.

[0016] 2. The piston rod starts to slide on the left side of the first ring and squeezes the hydraulic oil in the first cavity. The hydraulic oil in the first cavity is squeezed through the first through hole of the first ring and the second through hole of the second ring and then enters the second cavity. The resistance when the hydraulic oil flows through the first through hole and the second through hole further reduces the braking speed of the brake disc. As the piston rod gradually blocks part of the first through hole, the resistance encountered by the hydraulic oil during flow gradually increases, and the resistance encountered by the brake disc also gradually increases, reducing the amount of change in the braking speed of the brake disc in the initial stage of braking, and avoiding direct locking of the first brake pad and the brake disc, which may cause damage to the driving shaft due to excessive torque.

[0017] 3. The second brake pad contacts and squeezes the brake disc, and the friction between the second brake pad and the brake disc further controls the rotation speed of the brake disc until the brake disc stops rotating. This allows the driving shaft to evenly bear the torque generated in each stage within the same braking time, thereby protecting the driving shaft and improving the service life and efficiency of the device.

[0018] 4. The locking block enters the brake disc groove to lock the brake disc, preventing abnormal movement of the beam pumping unit from threatening the safety of the staff and providing safety protection for the staff during subsequent maintenance.

[0019] 5. The sliding rod is used to limit the rotating block, and then the driving shaft is braked urgently to prevent the walking beam pumping unit from rotating autonomously due to abnormal movement, which may cause personal injury to the maintenance workers and improve the safety of maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the brake mechanism of the present invention.

[0022] Figure 3 It is an exploded view of the brake mechanism and buffer mechanism of the present invention.

[0023] Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle.

[0024] Figure 5It is a schematic diagram of the three-dimensional structure of the locking mechanism of the present invention.

[0025] Figure 6 It is a partial cross-sectional view of the three-dimensional structure of the locking mechanism of the present invention.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the emergency mechanism and other parts of the present invention.

[0027] Figure 8 It is a cross-sectional view of the emergency mechanism of the present invention.

[0028] Figure 9 It is a schematic diagram of the three-dimensional structure of the bracket, swivel and other parts of the present invention.

[0029] Among them, the above drawings include the following figure marks: 1. base plate, 2. sliding member, 3. driving motor, 401. screw, 402. driving shaft, 403. brake disc, 404. square groove, 5. brake mechanism, 501. first ring, 5011. first cavity, 502. piston rod, 503. first intermediate ring, 504. first brake pad, 6. buffer mechanism, 601. second ring, 6011. second cavity, 602. intermediate tube, 6021. first piston, 6022. second piston, 6023. first elastic element, 603. second intermediate ring, 604. second brake pad, 7 , locking mechanism, 701, fixed block, 702, first limiting rod, 703, T-shaped block, 704, rotating shaft, 705, rotating rod, 706, second elastic element, 707, self-adjusting slider, 708, third elastic element, 709, locking block, 710, T-shaped baffle, 8, emergency mechanism, 801, bracket, 802, rotating block, 803, L-shaped plate, 804, limiting slide rod, 805, retaining ring, 806, fourth elastic element, 807, blocking block, 808, second limiting rod, 809, fifth elastic element, 810, rotating sleeve, 811, L-shaped rod, 901, rotating ring, 902, handle. DETAILED DESCRIPTION

[0030] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures. They should not be understood as limitations on this patent. In order to better illustrate the embodiments of the present invention, some structures in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and descriptions in the drawings may be omitted. Example 1

[0031] An electronically controlled brake device for a beam pumping unit, such as Figures 1-6As shown, it includes a base plate 1, and two symmetrically distributed sliding members 2 are slidably connected to the upper side of the base plate 1. A driving motor 3 is fixedly installed on the right end of the upper side of the base plate 1. The output shaft of the driving motor 3 is fixedly connected to a screw 401. The thread directions of the left and right parts of the screw 401 are opposite. The screw 401 is threadedly connected to the sliding member 2. A driving shaft 402 is provided between the sliding members 2. The driving shaft 402 is fixedly connected to a brake disc 403 for braking. The edge of the brake disc 403 is provided with circumferentially equidistantly distributed slots, which are used for subsequent limiting of the brake disc 403. The position is fixed, and the slot is composed of an arc area and a straight area, which further increases the limiting distance of the slot to ensure its subsequent normal locking. The sliding part 2 is symmetrically provided with a brake mechanism 5 for braking the walking beam pumping machine. The brake mechanism 5 includes a first ring 501, which is fixed to the sliding part 2. A first cavity 5011 is provided in the first ring 501, and the first cavity 5011 is filled with hydraulic oil for transmitting power and limiting the braking speed. The first ring 501 is provided with first through holes distributed equidistantly in the circumference, and the first through holes are provided. The number of openings and closings buffers subsequent braking to prevent the driving shaft 402 from being overloaded and broken. The first through hole is communicated with the first cavity 5011. The first ring 501 is fixed to the sliding member 2. The first ring 501 is slidably connected to the piston rod 502. The piston rod 502 is fixed to the first intermediate ring 503 through the intermediate fixing rod. The first intermediate ring 503 is provided with a circumferentially distributed first air storage cavity. The first air storage cavity is filled with inert gas. The inert gas is used as the intermediate force transmission medium to slowly stop the brake disc 403. The first intermediate ring 50 A first brake pad 504 for contacting and braking the brake disc 403 is slidably connected to the first brake pad 504. First sliding rods are fixedly connected to the first brake pad 504 at equal intervals around the circumference. The first sliding rods slide in the adjacent first air storage cavity. The first ring 501 is provided with a buffer mechanism 6 for slowing down the speed of the brake disc 403 during the initial braking phase. The sliding member 2 is symmetrically provided with a locking mechanism 7 for increasing safety. The resistance of the hydraulic oil in the first cavity 5011 squeezed by the piston rod 502 slows down the rotation speed of the first brake pad 504, thereby slowing down the rotation speed of the brake disc 403.

[0032] like Figure 2-Figure 4As shown, the buffer mechanism 6 includes a second ring 601, the second ring 601 is fixedly connected to the inner side of the first ring 501, and a second cavity 6011 is provided in the second ring 601. The second cavity 6011 is filled with hydraulic oil for transmitting power and limiting braking speed. The second ring 601 is provided with second through holes distributed circumferentially, and the second through holes are communicated with the second cavity 6011. The flow rate of the hydraulic oil is controlled by the opening and closing number of the first through holes, thereby controlling the resistance of the brake disc 403, reducing the change in the braking speed of the brake disc 403 in the initial stage of braking, and avoiding the driving shaft 402 directly turning from a high-speed rotation state to a static state due to a too short braking process. When in the stopped state, it is damaged by excessive torque. The first cavity 5011 is connected to the second cavity 6011 through the first through hole and the second through hole. The second ring 601 is fixed with a circumferentially distributed intermediate tube 602. The intermediate tube 602 is connected to the second cavity 6011. The hydraulic oil flows into the intermediate tube 602 through the second cavity 6011 for subsequent further braking. The intermediate tube 602 is connected to the first piston 6021 and the second piston 6022 by sliding from one side close to the second ring 601 to the other side in sequence. An inert gas is arranged between the first piston 6021 and the second piston 6022. As the inert gas is squeezed, the speed change in the final stage of the brake is increased.

[0033] like Figures 1-6 As shown, a first elastic element 6023 is fixedly connected between the second piston 6022 and the intermediate tube 602, and the first elastic element 6023 is a spring. A second intermediate ring 603 is fixedly connected to the side of the second piston 6022, which is equidistant around the circumference and away from the second ring 601. The second intermediate ring 603 is provided with a circumferentially distributed second air storage cavity, which is filled with inert gas. The second intermediate ring 603 is slidably connected with a second brake pad 604. By compressing the inert gas in the second air storage cavity, the second brake pad 604 squeezes the brake disc 403, further slowing down the rotation speed of the brake disc 403. The symmetrically distributed first brake pad 504 and the second brake pad 604 are both set to a rough surface on one side close to the brake disc 403. The rough surfaces of the first brake pad 504 and the second brake pad 604 are used to increase the friction between the first brake pad 504 and the second brake pad 604 and the brake disc 403. The second brake pad 604 is provided with a circumferentially distributed second sliding rod, which slides in the adjacent second air storage cavity.

[0034] like Figures 1-6As shown, the locking mechanism 7 includes symmetrically distributed fixed blocks 701, and the symmetrical fixed blocks 701 are respectively fixed to adjacent sliding members 2. A first limiting rod 702 is fixed between the fixed blocks 701, and a T-shaped block 703 is slidingly connected between adjacent first limiting rods 702. The T-shaped block 703 is provided with a symmetrical limiting groove, which consists of a straight groove and an oblique groove connected end to end. The straight groove is perpendicular to the axis of the first limiting rod 702, and the oblique groove is connected to the end of the straight groove away from the fixed block 701. The symmetrical oblique groove is close to the end away from the brake disc 403, which is convenient for subsequent limiting locking of the brake disc 403. The symmetrical limiting grooves are respectively limited and matched with the adjacent first limiting rods 702. The T-shaped block 703 is rotatably connected to a rotating shaft 704, and the rotating shaft 704 is fixed with a symmetrical rotating rod 705. The rotating rod 705 controls the brake disc 403 to stop rotating. The position is locked, a second elastic element 706 is fixedly connected between the T-shaped block 703 and the rotating rod 705, and the second elastic element 706 is a torsion spring. The rotating rod 705 is slidably connected with a self-adjusting slider 707, and a third elastic element 708 is fixedly connected between the self-adjusting slider 707 and the rotating rod 705. The third elastic element 708 is a spring. A locking block 709 that cooperates with the slot of the brake disc 403 is rotatably connected between the symmetrical self-adjusting sliders 707. The first limiting rod 702, the rotating shaft 704 and the locking block 709 have all undergone heat treatment to change their internal and surface structures. The heat treatment is a tempering treatment, which greatly improves the hardness, strength and toughness of the first limiting rod 702, the rotating shaft 704 and the locking block 709, thereby increasing the service life of the device. The T-shaped block 703 is fixedly connected with a T-shaped baffle 710 that limits the rotation range of the rotating rod 705.

[0035] When the walking beam pumping unit needs to be braked, the staff starts the drive motor 3, and the output shaft of the drive motor 3 drives the screw 401 to rotate clockwise, and the screw 401 drives the two sliding members 2 and the parts thereon to slide toward each other on the upper side of the base plate 1. Taking the sliding member 2 on the right as an example, the sliding member 2 on the left and the parts thereon move toward each other synchronously, and the first brake pad 504 gradually approaches the brake disc 403. When the first brake pad 504 contacts and fits with the brake disc 403, the friction between the first brake pad 504 and the brake disc 403 is small during the initial contact, which is not enough to make the piston rod 502 slide on the left side of the second ring 601 to squeeze the liquid in the second cavity 6011. The oil is pressed, and the first brake pad 504 and the brake disc 403 rotate relative to each other, pre-braking the walking beam pumping unit to prevent the first brake pad 504 and the brake disc 403 from directly locking during the braking process, causing the driving shaft 402 to be damaged by excessive torque. As the screw 401 continues to rotate clockwise, the first intermediate ring 503 continues to move to the left, and the first sliding rod of the first brake pad 504 begins to squeeze the inert gas in the first air storage cavity of the first intermediate ring 503. The compressed inert gas squeezes the first brake pad 504, thereby increasing the friction between the first brake pad 504 and the brake disc 403, thereby slowing down the rotation speed of the brake disc 403.

[0036] When the friction between the first brake pad 504 and the brake disc 403 is large enough, the brake disc 403 rotates with the first brake pad 504, and the first brake pad 504 drives the piston rod 502 and the first intermediate ring 503 to rotate together. The piston rod 502 begins to slide on the left side of the first ring 501 and squeezes the hydraulic oil in the first cavity 5011. The hydraulic oil in the first cavity 5011 is squeezed through the first through hole of the first ring 501 and the second through hole of the second ring 601 and then enters the second cavity 6011. The braking speed of the brake disc 403 is reduced by the resistance of the hydraulic oil flowing through the first through hole and the second through hole. As the piston rod 502 gradually blocks part of the first through hole, the resistance encountered by the hydraulic oil during flow gradually increases, and the resistance encountered by the brake disc 403 also gradually increases, reducing the amount of change in the braking speed of the brake disc 403 in the initial stage of braking, avoiding direct locking of the first brake pad 504 and the brake disc 403, which causes the driving shaft 402 to be overloaded. The large torque causes damage, and then the hydraulic oil enters the middle pipe 602 again, and begins to push the symmetrical first piston 6021 to move relative to each other. The first piston 6021 compresses the inert gas between it and the second piston 6022, and the compressed inert gas transmits force to the second piston 6022, and the second piston 6022 moves to the left. The second piston 6022 compresses the adjacent first elastic element 6023 and pushes the second middle ring 603 to move to the left. The second middle ring 603 pushes the second brake pad 604 to move to the left through the reaction force of the compression of the inert gas therein. The second brake pad 604 contacts and squeezes the brake disc 403, and the friction between the second brake pad 604 and the brake disc 403 further slows down the rotation speed of the brake disc 403 until the brake disc 403 stops rotating, so that the driving shaft 402 can evenly bear the torque generated in each stage within the same braking time, thereby protecting the driving shaft 402 and improving the service life and efficiency of the device.

[0037] Then the sliding member 2 continues to move to the left, carrying the first intermediate ring 503 and the second intermediate ring 603 to move continuously, and the first intermediate ring 503 and the second intermediate ring 603 further squeeze the inert gas therein respectively, and the compressed inert gas squeezes the first brake pad 504 and the second brake pad 604 respectively, further increasing the friction between the brake disc 403 and the first brake pad 504 and the second brake pad 604, and fixing the brake disc 403 by the static friction between the two, ensuring the normal progress of subsequent maintenance work by the staff.

[0038] During the movement of the sliding member 2, the sliding member 2 drives the adjacent fixed block 701 to move in opposite directions, and the fixed block 701 carries the first limiting rod 702 to slide in the straight groove section of the adjacent limiting groove on the T-shaped block 703. As the sliding member 2 moves, when the brake disc 403 is braked, the first limiting rod 702 enters the oblique groove section of the limiting groove of the adjacent T-shaped block 703. Under the limiting cooperation of the first limiting rod 702 and the oblique groove section of the limiting groove of the adjacent T-shaped block 703, the symmetrical T-shaped blocks 703 begin to carry the parts thereon to move in opposite directions. When the brake disc 403 stops rotating and the brake disc 403 is locked, the first limiting rod 702 enters the oblique groove section of the limiting groove of the adjacent T-shaped block 703. When the horizontal area of ​​the stop block 709 is a slot, at this time, as the locking block 709 continues to move, the locking block 709 moves to fit the arc area of ​​the slot of the brake disc 403. When the brake disc 403 stops rotating and the area of ​​the brake disc 403 in the horizontal direction of the locking block 709 is the area between adjacent slots, at this time, as the locking block 709 continues to move, the locking block 709 is squeezed by the brake disc 403 and begins to deflect with the rotation center of the rotating shaft 704, twisting the second elastic element 706 until it enters the slot of the brake disc 403 and fits the arc area of ​​the slot of the brake disc 403.

[0039] When the first limit rod 702 is fully inserted into the groove of the brake disc 403, if the first limit rod 702 is located at the adjacent end of the symmetrical limit groove of the T-shaped block 703, the brake disc 403 is locked. By quenching and tempering the first limit rod 702, the rotating shaft 704 and the locking block 709 with high temperature, the hardness, strength and toughness of the first limit rod 702, the rotating shaft 704 and the locking block 709 are greatly improved, the service life of the three is increased, and the reliability of the device is further improved. If the first limit rod 702 does not slide to the symmetrical limit groove of the T-shaped block 703, the brake disc 403 is locked. When the first limiting rod 702 slides to the adjacent end of the symmetrical limiting groove of the T-shaped block 703, the locking block 709 enters the slot of the brake disc 403 to lock the brake disc 403, avoiding abnormal movement of the walking beam pumping unit to threaten the safety of the staff and providing safety protection for the staff during subsequent maintenance. After the locking is completed, the staff turns off the drive motor 3.

[0040] After the staff completes the maintenance of the walking beam pumping unit, the staff turns on the drive motor 3, and the output shaft of the drive motor 3 drives the screw 401 to rotate. The two symmetrical sliding parts 2 carrying the parts thereon begin to move backward under the action of the screw 401. As the first limit rod 702 moves in the inclined groove of the T-shaped block 703, the symmetrical T-shaped block 703 carries the parts thereon and begins to move backward. The locking block 709 gradually disengages from the slot of the brake disc 403 and gradually loses the lock on the brake disc 403. When the locking block 709 is completely disengaged from the slot of the brake disc 403, as the sliding part 2 moves, the first brake pad 504 and the second brake pad 604 also gradually lose their fixation to the brake disc 403. After all parts are reset, the staff turns off the drive motor 3. Example 2

[0041] On the basis of Example 1, Figure 1 、 Figure 7 and Figure 8 As shown, it also includes an emergency mechanism 8 for limiting the driving shaft 402, the emergency mechanism 8 is arranged on the base plate 1, and the emergency mechanism 8 includes a bracket 801, the bracket 801 is fixed to the upper side of the base plate 1, the bracket 801 is rotatably connected to a rotating block 802 for rotating with the driving shaft 402 in an emergency, the rotating block 802 is provided with four limiting holes, the bracket 801 is fixed to a circumferentially distributed L-shaped plate 803, the L-shaped plate 803 is slidably connected to four limiting slides 804 that are limited and matched with adjacent limiting holes on adjacent rotating blocks 802, the limiting slide 804 is fixed to a retaining ring 805, and a fourth elastic element 806 for emergency braking of the driving shaft 402 is fixed between the retaining ring 805 and the L-shaped plate 803. The fourth elastic element 806 is a spring, and the rotating block 802 is slidingly connected to the clamping block 807. The clamping block 807 is fixed with a circumferentially distributed second limiting rod 808. A fifth elastic element 809 is fixed between the clamping block 807 and the rotating block 802. The fifth elastic element 809 is a spring, and the rotating block 802 is threadedly connected to the rotating sleeve 810. The rotating sleeve 810 is provided with a notch that cooperates with the second limiting rod 808. The notch is a right-angled trapezoid and its upper bottom is close to the second ring 601. Through the cooperation of the rotating sleeve 810 and the clamping block 807, the clamping block 807 is automatically adjusted to the ready-to-trigger state, reducing the operating steps of the staff and increasing the protection of the device to the staff. A square groove 404 that cooperates with the clamping block 807 is provided at the right end of the active shaft.

[0042] like Figure 7-Figure 9As shown, the rotating sleeve 810 is provided with circumferentially distributed arc grooves, and the opposite sides of the symmetrical second ring 601 are fixed with circumferentially distributed L-shaped rods 811, and the L-shaped rods 811 are limited by the arc grooves of the adjacent rotating sleeves 810 to realize automatic resetting of the rotating sleeves 810 and the blocking blocks 807, further increasing the practicality of the device and reducing the hazards caused by the lack of operating steps due to various reasons of the staff. The bracket 801 is slidingly connected to the rotating ring 901, and the rotating ring 901 is provided with circumferentially distributed arc limiting grooves. The rotating ring 901 is fixed with a handle 902, and the retaining ring 805 is fixed with a short rod that is limited by the arc limiting grooves of the adjacent rotating rings 901. The short rod of the retaining ring 805 is limited by the arc limiting grooves of the adjacent rotating rings 901 to quickly reset the limiting slide bar 804 and improve work efficiency.

[0043] When the symmetrical sliding parts 2 move relative to each other, the second ring 601 drives the four L-shaped rods 811 to move together, and the rotating sleeve 810 starts to rotate under the action of the arc groove and the L-shaped rod 811 on it, and the rotating sleeve 810 starts to move to the left under the action of the thread of the rotating block 802. The clamping block 807 carries the second limiting rod 808 and moves to the left with the rotating sleeve 810 under the elastic force of the fifth elastic element 809 until the sliding part 2 stops, and the clamping block 807 contacts the right side of the active shaft 402. When the staff is repairing the walking beam pumping unit, when the first brake pad 504 and the second brake pad 604 suddenly lose their fixation on the brake disc 403 and the locking block 709 also loses its lock on the brake disc 403, the active shaft 402 starts to rotate independently. When the square groove 404 at the right end of the active shaft 402 rotates to match the clamping block 807, the clamping block 807 moves to the left and enters the square groove 404 under the elastic force of the fifth elastic element 809, and the block 807 rotates with the driving shaft 402 under the limit of the square groove 404. When the driving shaft 402 rotates until the axis of the limiting hole of the rotating block 802 coincides with the axis of the limiting slide 804, the four limiting slides 804 carry the retaining ring 805 to move relative to each other under the elastic force of the fourth elastic element 806. At the same time, the short rod of the retaining ring 805 cooperates with the arc-shaped limiting groove of the rotating ring 901 to make the rotating ring 901 rotate clockwise until the retaining ring 805 contacts the rotating block 802, and the limiting slide 804 enters the limiting hole of the rotating block 802, limits the rotating block 802, and then performs emergency braking on the driving shaft 402 to prevent personal injury to the maintenance staff due to abnormal movement of the walking beam pumping unit, thereby improving the safety of the maintenance work.

[0044] When the maintenance is completed and needs to be reset, the staff turns on the drive motor 3, and the drive motor 3 drives the lead screw 401 to move the symmetrical sliding member 2 and the parts thereon in the opposite direction. The second ring 601 carries the L-shaped rod 811 to move together. Under the limiting cooperation between the L-shaped rod 811 and the rotating sleeve 810, the rotating sleeve 810 starts to rotate. Under the limiting action of the right-angled trapezoidal notch of the rotating sleeve 810, the second limiting rod 808 starts to move to the right, compressing the fifth elastic element 809, so that the block 807 and the first The second limit rod 808 is reset. At the same time, the staff pulls the handle 902 to drive the swivel 901 to rotate downward. Under the limit cooperation between the arc-shaped limit groove of the swivel 901 and the adjacent short rod of the retaining ring 805, the limit slide 804 moves outward, and the retaining ring 805 compresses the fourth elastic element 806. Then the rotating block 802 is slightly rotated to make the adjacent sides of the four limit slides 804 contact the outside of the rotating block 802. After completing the reset of all parts, the staff turns off the drive motor 3 for next use.

[0045] It should be understood that the above description is only for illustrative purposes and is not intended to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will fall within the scope of the claims herein.

Claims

1. An electronically controlled brake device for a beam pumping unit, comprising a base plate (1), the base plate (1) being slidably connected to symmetrically distributed sliding members (2), the base plate (1) being mounted with a drive motor (3), the output shaft of the drive motor (3) being fixedly connected to a lead screw (401), the lead screw (401) being threadedly connected to the sliding member (2), a driving shaft (402) being arranged between the sliding members (2), and a brake disc (403) being fixedly connected to the driving shaft (402), wherein: The invention also includes a symmetrically arranged brake mechanism (5), which is respectively arranged on both sides of the brake disc (403). The brake mechanism (5) is used to stop the walking beam pump. The brake mechanism (5) includes a first ring (501), which is fixedly connected to the sliding member (2). A first cavity (5011) is arranged in the first ring (501), and the first cavity (5011) is filled with hydraulic oil for transmitting power. The first ring (501) is provided with circumferentially distributed first through holes, which are communicated with the first cavity (5011). The first ring (501) is fixedly connected to the sliding member (2). The first ring (501) is slidably connected to a piston rod (502), and the piston rod (502) is fixedly connected to the first intermediate ring through an intermediate fixing rod. A ring (503), a first intermediate ring (503) is provided with a circumferentially distributed first air storage cavity, the first air storage cavity is filled with an inert gas, the first intermediate ring (503) is slidably connected with a first brake pad (504), the first brake pad (504) is circumferentially provided with a first slide bar, the first slide bar slides in an adjacent first air storage cavity, the first ring (501) is provided with a buffer mechanism (6) for reducing the speed change of the brake disc (403) in the initial stage of braking, a locking mechanism (7) for limiting the brake disc (403) is provided between the symmetrical sliding parts (2), and the rotation speed of the first brake pad (504) is slowed down by the resistance when the piston rod (502) squeezes the hydraulic oil in the first cavity (5011), thereby slowing down the rotation speed of the brake disc (403); The buffer mechanism (6) comprises a second circular ring (601), the second circular ring (601) being fixedly connected to the first circular ring (501), a second cavity (6011) being arranged in the second circular ring (601), the second cavity (6011) being filled with hydraulic oil for transmitting power, the second circular ring (601) being provided with circumferentially distributed second through holes, the second through holes being in communication with the second cavity (6011), the first cavity (5011) and the second cavity (6011) being in communication with each other through the first through holes and the second through holes, the second circular ring (601) being fixedly connected with a circumferentially distributed intermediate tube (602), the intermediate tube (602) being in communication with the second cavity (6011), a first piston (6021) and a second piston (6022) being slidably connected in sequence from one side of the intermediate tube (602) close to the second circular ring (601) to the other side, and an inert gas being arranged between the first piston (6021) and the second piston (6022); A first elastic element (6023) is fixedly connected between the second piston (6022) and the side of the intermediate tube (602) away from the second circular ring (601); a second intermediate circular ring (603) is fixedly connected to the side of the second piston (6022) away from the second circular ring (601); the second intermediate circular ring (603) is provided with a circumferentially distributed second gas storage cavity, the second gas storage cavity is filled with an inert gas, the second intermediate circular ring (603) is slidably connected with a second brake pad (604), the second brake pad (604) is provided with a circumferentially distributed second sliding rod, and the second sliding rod slides in an adjacent second gas storage cavity; The locking mechanism (7) comprises symmetrically distributed fixing blocks (701), the symmetrical fixing blocks (701) are respectively fixed to adjacent sliding members (2), the fixing blocks (701) are fixed to first limiting rods (702), a T-shaped block (703) is slidably connected between the symmetrical first limiting rods (702), the T-shaped block (703) is provided with symmetrical limiting grooves, the limiting grooves are composed of straight grooves and oblique grooves connected end to end, the symmetrical limiting grooves are respectively limitedly matched with adjacent first limiting rods (702), the T-shaped block (703) is rotatably connected to a rotating shaft (704), the rotating shaft (70 4) A symmetrical rotating rod (705) is fixedly connected, a second elastic element (706) is fixedly connected between the T-shaped block (703) and the rotating rod (705), a self-adjusting slider (707) is slidably connected to the rotating rod (705), a third elastic element (708) is fixedly connected between the self-adjusting slider (707) and the rotating rod (705), a locking block (709) is rotatably connected between the symmetrical self-adjusting sliders (707), the locking block (709) is limitedly matched with the slot of the brake disc (403), and a T-shaped baffle (710) is fixedly connected to the T-shaped block (703) for limiting the rotation range of the rotating rod (705).

2. The electronically controlled brake device for a beam pumping unit according to claim 1 is characterized in that: The edge of the brake disc (403) is provided with circumferentially distributed clamping grooves, and the clamping grooves are used to limit the position of the brake disc (403).

3. The electronically controlled brake device for a beam pumping unit according to claim 1 is characterized in that: The first brake pad (504) and the second brake pad (604) have a side close to the brake disc (403) that is configured as a rough surface, and the rough surfaces of the first brake pad (504) and the second brake pad (604) are used to increase the friction between the first brake pad (504) and the second brake pad (604) and the brake disc (403).

4. The electronically controlled brake device for a beam pumping unit according to claim 1 is characterized in that: The first limiting rod (702), the rotating shaft (704) and the locking block (709) are all subjected to heat treatment, and the heat treatment is used to increase the service life of the first limiting rod (702), the rotating shaft (704) and the locking block (709).

5. The electronically controlled brake device for a beam pumping unit according to claim 1 is characterized in that: The invention also comprises an emergency mechanism (8) for limiting the driving shaft (402), the emergency mechanism (8) being arranged on the bottom plate (1), the emergency mechanism (88) comprising a bracket (801), the bracket (801) being fixedly connected to the bottom plate (1), the bracket (801) being rotatably connected to a rotating block (802), the rotating block (802) being provided with circumferentially distributed limiting holes, the bracket (801) being fixedly connected to a circumferentially distributed L-shaped plate (803), the L-shaped plate (803) being slidably connected to a limiting slide bar (804) which is matched with the limiting holes adjacent to the limiting holes on the rotating block (802), the limiting slide bar (804) being fixedly connected to a retaining ring (805) ), a fourth elastic element (806) is fixedly connected between the retaining ring (805) and the L-shaped plate (803), a clamping block (807) is slidably connected to the rotating block (802), a circumferentially distributed second limiting rod (808) is fixedly connected to the clamping block (807), a fifth elastic element (809) is fixedly connected between the clamping block (807) and the rotating block (802), a rotating sleeve (810) is threadedly connected to the rotating block (802), the rotating sleeve (810) is provided with a notch that cooperates with the second limiting rod (808), and a square groove (404) that cooperates with the clamping block (807) is provided at one end of the driving shaft (402) close to the rotating block (802).

6. The electronically controlled brake device for a beam pumping unit according to claim 5 is characterized in that: The rotating sleeve (810) is provided with circumferentially distributed arcuate grooves, and a circumferentially distributed L-shaped rod (811) is fixedly connected to one side of the second ring (601) close to the rotating sleeve (810), and the L-shaped rod (811) is limitedly matched with an adjacent arcuate groove on the rotating sleeve (810).

7. The electronically controlled brake device for a beam pumping unit according to claim 5 is characterized in that: The bracket (801) is slidably connected to a rotating ring (901), the rotating ring (901) is provided with arc-shaped limiting grooves distributed in the circumferential direction, the rotating ring (901) is fixedly connected to a handle (902), and the retaining ring (805) is fixedly connected to a short rod that is limitedly matched with an adjacent arc-shaped limiting groove on the rotating ring (901).

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