Ground driving double-cylinder balance hydraulic brake device of oil extraction screw pump

Abstract

The utility model relates to a ground driving double-cylinder balance hydraulic brake device of an oil extraction screw pump. Reliable braking is achieved. A horizontal brake disc is fixedly arranged on a main shaft extending out of the top of an oil extraction screw pump ground driving device, the main shaft is sleeved with an upper brake fixed disc and a lower floating brake disc which are located on the upper face and the lower face of the horizontal brake disc respectively in a matched mode at intervals, and a plurality of parallel vertical sliding shafts extending downwards from the periphery of the upper brake fixed disc slide downwards, penetrate through the lower floating brake disc in a matched mode and are fixed to a brake base. At least two opposite oil pressure brake cylinders are circumferentially arranged between the brake seat and the lower floating brake disc; the upper brake fixed disc is kept at an upper initial position under non-hydraulic pressure by means of a supporting spring, and the lower floating brake disc is kept at a lower initial position under non-hydraulic pressure by means of a supporting spring; the main shaft drives the hydraulic brake driving mechanism through the overrun clutch or drives the hydraulic brake driving mechanism through the steering transmission mechanism and the overrun clutch. The brake buffering device has the advantages of strong and reliable braking buffering force, capability of avoiding equipment damage through intermittent braking, simplicity in operation and convenience in maintenance.

Description

Technical Field

[0001] The utility model relates to a ground-driven brake device for an oil production screw pump, in particular to a ground-driven double-cylinder balanced hydraulic brake device for an oil production screw pump. Background Art

[0002] When a downhole progressive cavity pump system is operating, the surface drive transmits torque to the wellbore via the sucker rod. This torque causes the rod to deform elastically and store a certain amount of energy. If the surface drive suddenly stops, causing the fluid in the tubing string to drop and pressure to build up, the stored energy in the sucker rod is released, causing the drive to reverse direction. This reverse rotation often accelerates, even to the point of "runaway," potentially causing equipment damage and personal injury. Utility Model Content

[0003] The utility model aims to overcome the above-mentioned defects of the prior art and provides a ground-driven double-cylinder balanced hydraulic brake device for an oil production screw pump.

[0004] To achieve the above-mentioned purpose, the utility model discloses a ground-driven double-cylinder balanced hydraulic brake device for oil production screw pump, which is special in that a horizontal brake disc is fixed on the main shaft extending from the top of the ground drive device of the oil production screw pump, and the main shaft is spaced apart with an upper brake fixed disc and a lower floating brake disc respectively located above and below the horizontal brake disc, and a plurality of parallel vertical sliding shafts extending downward from the periphery of the upper brake fixed disc are slidably fitted through the lower floating brake disc and fixed on the brake seat, and at least two relative oil pressure brake cylinders are circumferentially arranged between the brake seat and the lower floating brake disc; the upper brake fixed disc relies on a support spring to maintain the upper initial position under non-hydraulic conditions, and the lower floating brake disc relies on a support spring to maintain the lower initial position under non-hydraulic conditions; the main shaft drives the hydraulic brake drive mechanism through an overrunning clutch or the main shaft drives the hydraulic brake drive mechanism through a steering transmission mechanism and an overrunning clutch, and the hydraulic brake drive mechanism drives the lower floating brake disc upward and the upper brake fixed disc downward through the oil pressure brake cylinder to clamp the horizontal brake disc for buffering braking. Compared to existing brake rings around vertical shafts, the horizontal brake disc fixed to the main shaft of the surface drive unit for oil production screw pumps avoids impact on the vertical shaft during braking, harming the main shaft bearings and significantly extending equipment life. The main shaft spacer is equipped with an upper fixed brake disc and a lower floating brake disc, respectively, located above and below the horizontal brake disc. Multiple parallel vertical slide shafts extending downward from the periphery of the upper fixed brake disc are threaded through the lower floating brake disc and secured to the brake seat. Multiple hydraulic brake cylinders are positioned circumferentially between the brake seat and the lower floating brake disc. This allows the upper and lower brake discs to squeeze the horizontal brake disc, preventing vertical vibration during braking. It also increases braking torque and multiplies the number of brake discs, enhancing and maintaining braking strength and ensuring stable braking. The fixed brake disc is maintained in its upper initial position by a support spring, while the lower floating brake disc is maintained in its lower initial position by a support spring. This ensures that the upper and lower floating brake discs securely separate from the horizontal brake disc when the brake oil pressure decreases, preventing unnecessary braking resistance, energy consumption, and equipment wear. Two or more pairs of opposing hydraulic brake cylinders enable balanced braking. The main shaft drives the hydraulic brake mechanism via an overrunning clutch, or via a steering transmission and an overrunning clutch. An overrunning clutch is a clutch that slips during forward drive and synchronizes during reverse drive. Compared to directly driving an overrunning clutch, driving the hydraulic brake mechanism via a steering transmission and an overrunning clutch provides more space for auxiliary equipment. The hydraulic brake mechanism provides a greater degree of braking cushioning while maintaining braking force, preventing damage from excessive braking. It also offers simple operation and easy maintenance. It offers the advantages of strong and reliable braking cushioning, no damage to the equipment, and simple operation and easy maintenance.

[0005] As an optimization, the main shaft is driven by an overrunning clutch, which is a main shaft driving a hydraulic brake drive mechanism through a one-way wheel overrunning clutch.

[0006] The main shaft is driven by a steering transmission mechanism and an overrunning clutch. Alternatively, the main shaft drives a transverse shaft or a lateral shaft via a steering gear, which in turn drives a hydraulic brake drive mechanism via a one-way wheel overrunning clutch. Alternatively, the main shaft drives a transverse shaft or a lateral shaft via a steering gear, with one end of the transverse shaft or the lateral shaft driving a main sheave. The main sheave drives a secondary sheave via a transmission belt, which in turn drives the one-way wheel overrunning clutch and the hydraulic brake drive mechanism. This configuration, compared to the previous description, helps avoid impacts on the space occupied by other ancillary mechanisms of the main shaft. In this configuration, the main sheave driven by the main shaft drives the secondary sheave via a transmission belt, which provides increased cushioning compared to methods that omit the main sheave, transmission belt, and secondary sheave, helping to prevent severe brake lock. The one-way wheel overrunning clutch drives the hydraulic brake drive mechanism, automatically activating the brake during reverse rotation and ensuring that the brake is not activated during forward rotation. Compared to the lateral shaft, the other end of the transverse shaft can also be connected to the motor drive mechanism of the screw oil extraction machine.

[0007] As an optimization, the drive belt is equipped with an adjustable tensioner for adjusting tension. Braking force can be flexibly adjusted based on oil production depth and reverse force, ensuring appropriate braking by preventing excessive or insufficient braking through moderate belt slippage. The drive belt is preferably composed of multiple V-belts. This multi-V-belt transmission ensures reliable transmission while preventing poor braking from affecting individual V-belt conditions.

[0008] As an optimization, the brake seat is fixed on the large housing of the ground drive device of the oil production screw pump, and the upper brake fixed disc and the lower floating brake disc are configured to slide vertically and circumferentially with the main shaft. Brake friction pads that cooperate with the horizontal brake disc are respectively embedded under the upper brake fixed disc and on the lower floating brake disc. The brake seat is fixed on the large housing of the ground drive device of the oil production screw pump to provide stable support for the brake. The upper brake fixed disc and the lower floating brake disc are configured to slide vertically and circumferentially with the main shaft, which is conducive to ensuring braking stability. Brake friction pads that cooperate with the horizontal brake disc are respectively embedded under the upper brake fixed disc and on the lower floating brake disc to ensure braking force and durability. The hydraulic brake cylinder is equipped with an exhaust bolt, which can avoid air braking by exhausting air to ensure oil braking.

[0009] As an optimization, the hydraulic brake drive mechanism utilizes an overrunning clutch that drives a hydraulic pump. This hydraulic pump is connected to the hydraulic brake cylinder and regulating valve via a hydraulic oil output pipe. The hydraulic pump is connected to the hydraulic oil tank via a hydraulic oil input pipe, and the regulating valve is connected to the hydraulic oil tank via a return oil pipe. The overrunning clutch can disengage to completely release the spindle, meeting the requirements of a free spindle operation. Furthermore, during braking, the clutch can be manipulated for intermittent braking, preventing unnecessary damage to downhole equipment caused by excessive braking.

[0010] As an optimization, after buffering the brake, the regulating valve is opened, and under the pressure of the support spring, some of the hydraulic oil in the hydraulic brake cylinder is allowed to flow back into the hydraulic oil tank through the hydraulic oil output pipe, the return pipe and the regulating valve. This simplifies the recovery from the non-braking state.

[0011] As an optimization, the regulating valve is an overpressure relief valve with a settable overpressure value. In this way, intermittent braking can be automatically achieved by intermittent automatic overpressure release. That is, because the overpressure opening of the overpressure relief valve is sudden, the hydraulic oil released when the overpressure is opened cannot release the overpressure to the extent that it is necessary, but must be over-released. After the over-release, the overpressure relief valve is closed, and there must be a process of re-pumping oil and pressurizing. This re-pumping oil and pressurizing until the overpressure is released again will inevitably be able to brake again through the hydraulic cylinder. In this way, repeated release of pressurization will inevitably complete intermittent braking. Compared with continuous braking, intermittent braking can not only avoid brake locking, but also avoid unnecessary damage to underground equipment caused by excessive braking through intermittent buffering during braking. The diameter of the return oil pipe where the overpressure relief valve is located is larger than the diameter of the hydraulic oil output pipe, so that sufficient over-release can be ensured by increasing the release flux; when the overpressure value is lower than the overpressure value, the overpressure relief valve is closed, and the brake disc is clamped when the hydraulic oil is supplied; when the overpressure value is exceeded, the overpressure relief valve opens and the oil supply pressure drops, releasing the horizontal brake disc; the hydraulic oil is released through the release valve and then the overpressure relief valve is closed when the overpressure value is lower than the overpressure value, and the brake disc is clamped when the hydraulic oil is supplied. This cycle is repeated until the torque is released.

[0012] As an optimization, the main shaft is equipped with a driven sheave above the upper brake plate. The large housing of the oil production screw pump's ground drive unit houses the drive motor and its output shaft drive sheave via two outriggers. These two drive sheaves each drive the driven sheave via multiple parallel V-belts. A chassis is located beneath the large housing. The upper portion of the chassis cavity houses the one-way overrunning clutch driven by the main shaft and the hydraulic pump that drives the hydraulic brake drive mechanism. This facilitates the deployment of powerful driving power. The hydraulic pump, connected by a pipeline to a hydraulic oil tank and regulating valve, is mounted on the outriggers.

[0013] Alternatively, the main shaft drives a horizontal shaft extending from the opposite side of the large housing of the oil production screw pump's surface drive unit through a steering transmission mechanism. A driven sheave is located at one end of the horizontal shaft. A drive motor and a driving sheave at the output shaft end are located on the side of the large housing adjacent to the driven sheave via an outwardly extending adjustable support. Each driving sheave drives the driven sheave via multiple parallel V-belts. A one-way wheel overrunning clutch driven by the other end of the horizontal shaft and a hydraulic pump for a hydraulic brake drive mechanism driven by the one-way wheel overrunning clutch are located on the opposite side of the large housing. A hydraulic oil tank and a regulating valve connected to the hydraulic pump via an oil pipeline are located on one side of the outwardly extending adjustable support. This relatively coaxial arrangement facilitates separate maintenance of the power mechanism and brake drive mechanism.

[0014] Alternatively, the main shaft, through a steering transmission mechanism, drives a side shaft extending from the side of the main housing of the surface drive unit for the oil production screw pump. This side shaft is secured with a primary sheave and a secondary sheave, mounted in sequence from the inside out. The primary sheave drives a secondary sheave via a transmission belt, which in turn drives a one-way overrunning clutch, which in turn drives the hydraulic pump of the hydraulic brake drive mechanism. A base frame is located beneath the main housing. The drive motor and its output shaft end active sheave are mounted on an externally extending adjustable support. The active sheave drives the secondary sheave via multiple parallel V-belts. The primary sheave, transmission belt, and secondary sheave provide additional braking cushioning. This coaxial configuration, compared to the aforementioned oppositely arranged configuration, offers greater clearance for wellhead maintenance and operation. The hydraulic pump, connected via an oil pipeline to a hydraulic oil tank and regulating valve, is mounted on the externally extending adjustable support.

[0015] Alternatively, the main shaft drives a side extension shaft extending from a side of a large box body of a ground drive device of an oil production screw pump through a steering transmission mechanism, a driven sheave is fixed on the side extension shaft, a base frame is provided under the large box body, a driving motor and an active sheave at the output shaft end of the base frame are provided on an outward-extending adjustment support of the base frame, and the active sheaves drive the driven sheaves through multiple parallel V-belts; a one-way wheel overrunning clutch driven by the main shaft and a hydraulic pump of a hydraulic brake drive mechanism driven by the one-way wheel overrunning clutch are provided on the upper part of the base frame cavity.

[0016] As an optimization, a wellhead seat is positioned below the base frame. The lower end of the main shaft in the center of the base frame is driven downward via a seamless slip coupling to connect to the lower section of the main shaft. The lower section of the main shaft extends downward through a packing seal box at the bottom of the base frame and into the wellhead seat. The seamless slip coupling facilitates disassembly and maintenance. The packing seal box acts as a wellhead seal for the main shaft.

[0017] This new brake system utilizes a hydraulic pump as its power source. When the drive gear shaft rotates clockwise (forward), the hydraulic pump is inoperative. If the drive shaft reverses for some reason, the one-way wheel (clutch) drives the hydraulic pump through a coupling. The pump supplies oil, and the hydraulic cylinder actuates to lift the floating brake disc and compress the pressure spring. The dual brake pads clamp the discs and the main shaft, applying braking force. The braking process progresses as follows: oil supply, clamping the brake pads, oil cutoff, release, re-clamping, and release, all until torque is released. A regulating valve adjusts the pressure and also provides a release function. This hydraulic brake utilizes dual cylinders, pressure springs for cushioning, and a floating disc for clamping. This mechanism offers reliable braking, simple operation, and easy maintenance.

[0018] As an optimization, the main shaft drives the main sheave located on the upper side of the screw pump's surface drive unit through a steering gear transmission mechanism. The main sheave drives the one-way sheave located on the lower side of the screw pump's surface drive unit through a transmission belt. This reduces the space occupied by the large main sheave and also helps increase the speed of the one-way sheave.

[0019] After adopting the above technical solution, the utility model of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pump has the advantages of strong and reliable buffer braking force, can avoid equipment damage through intermittent braking, is simple to operate, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a schematic diagram of the brake structure of a ground-driven double-cylinder balanced hydraulic brake device for an oil production screw pump. Figure 2 This is a structural diagram of the first embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps before it is connected to the hydraulic sump tank and the hydraulic oil pipe. Figure 3 It is a structural schematic diagram of the core part of the first embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps of the present invention. Figure 4 It is a schematic diagram of the main structure of the second embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps of the present invention. Figure 5 It is a side structural schematic diagram of a second embodiment of the ground-driven double-cylinder balanced hydraulic brake device for an oil production screw pump of the present invention. Figure 6 This is a schematic diagram of the main structure of the core part of the second embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps of the present invention. Figure 7 It is a main structural schematic diagram of the third embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps of the present invention. Figure 8 This is a schematic diagram of the main structure of the core part of the third embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps of the present invention. Figure 9 It is a schematic diagram of the main structure of the fourth embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps of the present invention. Figure 10 It is a top structural schematic diagram of the fourth embodiment of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pumps of the present invention. DETAILED DESCRIPTION

[0021] Embodiment 1, as shown in Figures 1-3, the utility model of the ground-driven double-cylinder balanced hydraulic brake device of the oil production screw pump is a main shaft 11 extending from the top of the ground drive device of the oil production screw pump, with a horizontal brake disc 4 fixed thereon, and the main shaft 11 is spaced apart and fitted with an upper brake fixed disc 2 and a lower floating brake disc 3 respectively located above and below the horizontal brake disc 4, and a plurality of parallel vertical sliding shafts extending downward from the periphery of the upper brake fixed disc 2 are slidably fitted through the lower floating brake disc 3 and fixed on the brake seat 5, and at least two relative oil pressure brake cylinders 6 are circumferentially arranged between the brake seat 5 and the lower floating brake disc 3; the upper brake fixed disc 2 relies on a support spring to maintain an upper initial position under non-hydraulic conditions, and the lower floating brake disc 3 relies on a support spring to maintain a lower initial position under non-hydraulic conditions; the main shaft 11 drives the hydraulic brake drive mechanism through the overrunning clutch 80 transmission mechanism, or the main shaft can drive the hydraulic brake drive mechanism through the steering transmission mechanism and the overrunning clutch, and the hydraulic brake drive mechanism drives the lower floating brake disc 3 upward and the upper brake fixed disc 2 downward through the oil pressure brake cylinder 6 to clamp the horizontal brake disc 4 for buffering braking. Compared to existing brake rings around vertical shafts, the horizontal brake disc fixed to the main shaft of the surface drive unit for oil production screw pumps avoids impact on the vertical shaft during braking, harming the main shaft bearings and significantly extending equipment life. The main shaft spacer is equipped with an upper fixed brake disc and a lower floating brake disc, respectively, located above and below the horizontal brake disc. Multiple parallel vertical slide shafts extending downward from the periphery of the upper fixed brake disc are threaded through the lower floating brake disc and secured to the brake seat. Multiple hydraulic brake cylinders are positioned circumferentially between the brake seat and the lower floating brake disc. This allows the upper and lower brake discs to squeeze the horizontal brake disc, preventing vertical vibration during braking. It also increases braking torque and multiplies the number of brake discs, enhancing and maintaining braking strength and ensuring stable braking. The fixed brake disc is maintained in its upper initial position by a support spring, while the lower floating brake disc is maintained in its lower initial position by a support spring. This ensures that the upper and lower floating brake discs securely separate from the horizontal brake disc when the brake oil pressure decreases, preventing unnecessary braking resistance, energy consumption, and equipment wear. Two or more pairs of opposing hydraulic brake cylinders enable balanced braking. The main shaft drives the hydraulic brake mechanism via an overrunning clutch, or via a steering transmission and an overrunning clutch. An overrunning clutch is a clutch that slips during forward drive and synchronizes during reverse drive. Compared to directly driving an overrunning clutch, driving the hydraulic brake mechanism via a steering transmission and an overrunning clutch provides more space for auxiliary equipment. The hydraulic brake mechanism provides a greater degree of braking cushioning while maintaining braking force, preventing damage from excessive braking. It also offers simple operation and easy maintenance. It offers the advantages of strong and reliable braking cushioning, no damage to the equipment, and simple operation and easy maintenance.

[0022] Specifically, the main shaft 11 is driven by the overrunning clutch, and the main shaft 11 drives the hydraulic brake drive mechanism through the one-way wheel overrunning clutch 80.

[0023] Specifically, the brake seat 5 is fixed to the large housing 1 of the surface drive unit of the oil production screw pump. The upper brake plate 2 and the lower floating brake plate 3 are vertically and circumferentially slidably mounted on the main shaft 11. Brake friction pads 41 are embedded on the lower surface of the upper brake plate 2 and the upper surface of the lower floating brake plate 3, respectively, and cooperate with the horizontal brake plate 4. The hydraulic brake cylinder 6 is equipped with an exhaust bolt 61.

[0024] Specifically, the hydraulic brake drive mechanism consists of an overrunning clutch 80 driving a hydraulic pump 8. This pump 8 is connected to the hydraulic brake cylinder 6 and a regulating valve 9 via a hydraulic oil output pipe 91. This pump 8 is connected to a hydraulic oil tank 90 via a hydraulic oil input pipe 92. The regulating valve 9 is then connected to the hydraulic oil tank 90 via a return pipe 93. More specifically, after the buffer brake is applied, the regulating valve 9 opens, allowing some of the hydraulic oil in the hydraulic brake cylinder 6 to flow back into the hydraulic oil tank 90 through the hydraulic oil output pipe 91, the return pipe 93, and the regulating valve 9 under the pressure of the support spring. More specifically, the regulating valve 9 is an overpressure relief valve with a settable overpressure value. More specifically, the diameter of the return oil pipe 93 where the overpressure relief valve is located is larger than the diameter of the hydraulic oil output pipe 91; when the overpressure value is lower than the overpressure value, the overpressure relief valve is closed, and the horizontal brake disc 4 is clamped when the hydraulic oil is supplied; when the overpressure value is exceeded, the overpressure relief valve opens, the oil supply pressure drops, and the horizontal brake disc 4 is released; the hydraulic oil is released through the release valve, and then the overpressure relief valve is closed when the overpressure value is lower than the overpressure value, and the horizontal brake disc 4 is clamped when the hydraulic oil is supplied, and this cycle is repeated until the torque is released.

[0025] Specifically, the main shaft 11 is equipped with a driven sheave 12 above the upper brake plate 2. The main housing 1 of the surface drive unit for the oil production screw pump houses a drive motor 18 and its output shaft drive sheave 13, respectively, via two externally extending adjustable supports 19. Each of the two drive sheaves 13 drives the driven sheave 12 via multiple parallel V-belts. Below the main housing 1 is a base frame 20. The upper portion of the base frame 20 houses a one-way overrunning clutch 80 driven by the main shaft 11, as well as the hydraulic pump 8 of the hydraulic brake drive mechanism driven by the one-way overrunning clutch 80. More specifically, a wellhead seat is positioned below the base frame 20. The lower end of the main shaft 11 in the middle of the base frame 20 is driven downwardly by a non-marking slip coupling 21, which connects the lower section of the main shaft 11 downwardly. The lower section of the main shaft 11 then passes through a packing seal 22 at the bottom of the base frame 20 and extends downward into the wellhead seat. The wellhead seat 30 is not shown in the figure. The hydraulic pump 8 is connected to the hydraulic oil tank 90 and the regulating valve 9 through the oil pipeline and is arranged on the extended regulating support 19.

[0026] In the second embodiment, as shown in Figures 1 and 4-6, the present invention's ground-driven, dual-cylinder balanced hydraulic brake device for oil production screw pumps differs from the first embodiment in that the main shaft 11 drives the hydraulic brake drive mechanism via a steering transmission mechanism and an overrunning clutch 80. This means that the main shaft 11 drives the transverse shaft via a steering gear, and one end of the transverse shaft drives the hydraulic brake drive mechanism via a one-way wheel-type overrunning clutch 80.

[0027] The main shaft 11 drives the horizontal shaft extending from the opposite side of the large box 1 of the oil production screw pump ground drive device through the steering transmission mechanism, and a driven sheave 12 is provided at one end of the horizontal shaft. The side of the large box 1 adjacent to the driven sheave 12 is provided with a driving motor 18 and an active sheave at its output shaft end through an outward adjusting support 19, and each active sheave drives the driven sheave 12 through multiple parallel V-belts; the large box 1 is provided with a one-way wheel overrunning clutch 80 driven by the other end of the horizontal shaft on the opposite side of the driven sheave 12, and a hydraulic pump 8 of a hydraulic brake drive mechanism driven by the one-way wheel overrunning clutch 80; a wellhead seat 30 is provided downwardly on the chassis seat 20, and the lower end of the main shaft 11 in the middle of the chassis seat 20 is driven downwardly through a markless slip coupling to connect to the lower section of the main shaft 11, and the lower section of the main shaft 11 passes through the packing sealing box 22 at the bottom of the chassis seat 20 and extends downward into the wellhead seat 30. The hydraulic pump 8 is connected to a hydraulic oil tank 90 and a regulating valve 9 via an oil pipeline and is arranged on one side of the outwardly extending regulating support 19. The traceless slip coupling 21 is not shown in the figure.

[0028] In the third embodiment, as shown in Figures 1 and 7-8, the present invention's ground-driven, dual-cylinder balanced hydraulic brake device for oil production screw pumps differs from the second embodiment described above in that the main shaft 11 drives the side extension shaft via the steering gear, which in turn drives the main sheave 71. The main sheave 71 drives the auxiliary sheave 72 via the transmission belt 7, which in turn drives the one-way wheel-type overrunning clutch 80 and the hydraulic brake drive mechanism. The transmission belt 7 is equipped with an adjustable tensioner 73 for adjusting its tension.

[0029] The main shaft 11 drives a side extension shaft extending from the side of the large housing 1 of the oil production screw pump surface drive unit through a steering transmission mechanism. The side extension shaft is fixed with a main sheave 71 and a driven sheave 12, sequentially mounted from the inside to the outside. The main sheave 71 drives the auxiliary sheave 72 via a transmission belt 7. The auxiliary sheave 72 drives a one-way wheel overrunning clutch 80, which in turn drives the hydraulic pump 8 of the hydraulic brake drive mechanism. A chassis 20 is located below the large housing 1. A drive motor 18 and a driving sheave 13 at its output shaft end are mounted on an outwardly extending adjustment support 19 at the top of the chassis 20. The driving sheave 13 drives the driven sheave 12 via multiple parallel V-belts. The hydraulic pump 8 is mounted on the outwardly extending adjustment support 19, connected to a hydraulic oil tank 90 and a regulating valve 9 via an oil pipeline.

[0030] Embodiment 4, as shown in Figures 1 and 9-10, differs from the aforementioned embodiment 1 in that the main shaft drives a side shaft extending from a side of the large housing 1 of the surface drive device of the oil production screw pump through a steering transmission mechanism. The side shaft is fixedly provided with a driven sheave 12. A chassis 20 is provided below the large housing 1. A drive motor 18 and a driving sheave 13 at its output shaft end are provided on an outwardly extending adjustment support 19 of the chassis 20. Each driving sheave 13 drives the driven sheave 12 through multiple parallel V-belts. A main shaft-driven one-way wheel overrunning clutch and a hydraulic pump 8 for the one-way wheel overrunning clutch driving the hydraulic brake drive mechanism are provided in the upper portion of the chassis 20 cavity. The hydraulic pump 8 is provided with a hydraulic oil tank and a regulating valve connected via an oil pipeline and arranged on one side of the outwardly extending adjustment support 19.

[0031] This new brake system utilizes a hydraulic pump as its power source. When the drive gear shaft rotates clockwise (forward), the hydraulic pump is inoperative. If the drive shaft reverses for some reason, the one-way wheel (clutch) drives the hydraulic pump through a coupling. The pump supplies oil, and the hydraulic cylinder actuates to lift the floating brake disc and compress the pressure spring. The dual brake pads clamp the discs and the main shaft, applying braking force. The braking process progresses as follows: oil supply, clamping the brake pads, oil cutoff, release, re-clamping, and release, all until torque is released. A regulating valve adjusts the pressure and also provides a release function. This hydraulic brake utilizes dual cylinders, pressure springs for cushioning, and a floating disc for clamping. This mechanism offers reliable braking, simple operation, and easy maintenance.

[0032] In summary, the utility model of the ground-driven double-cylinder balanced hydraulic brake device for oil production screw pump has the advantages of strong and reliable buffer braking force, can avoid equipment damage through intermittent braking, is simple to operate, and is easy to maintain.

Claims

1. A ground driven double cylinder balanced hydraulic brake device for oil production screw pump, characterized in that A horizontal brake disc is fixed on the main shaft extending from the top of the ground drive device of the oil production screw pump, and the main shaft is spaced apart with an upper brake fixed disc and a lower floating brake disc respectively located above and below the horizontal brake disc. Multiple parallel vertical sliding shafts extending downward from the periphery of the upper brake fixed disc are lowered and passed through the lower floating brake disc and fixed on the brake seat, and at least two relative oil pressure brake cylinders are circumferentially arranged between the brake seat and the lower floating brake disc; the upper brake fixed disc is maintained in the upper initial position under non-hydraulic conditions by a support spring, and the lower floating brake disc is maintained in the lower initial position under non-hydraulic conditions by a support spring; the main shaft drives the hydraulic brake drive mechanism through an overrunning clutch or the main shaft drives the hydraulic brake drive mechanism through a steering transmission mechanism and an overrunning clutch, and the hydraulic brake drive mechanism drives the lower floating brake disc upward and the upper brake fixed disc downward through the oil pressure brake cylinder to clamp the horizontal brake disc for buffering braking.

2. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 1 is characterized in that The main shaft is driven by an overrunning clutch, which means that the main shaft drives the hydraulic brake drive mechanism through a one-way wheel overrunning clutch; The main shaft is driven by the steering transmission mechanism and the overrunning clutch, and the main shaft drives the transverse shaft or the side extension shaft through the steering gear, and the transverse shaft or the side extension shaft drives the hydraulic brake drive mechanism through the one-way wheel overrunning clutch; Or the main shaft drives the transverse shaft or side extension shaft through the steering gear, one end of the transverse shaft or the side extension shaft drives the main groove wheel, the main groove wheel drives the auxiliary groove wheel through the transmission belt, and the auxiliary groove wheel synchronously drives the one-way wheel overrunning clutch and the hydraulic brake drive mechanism.

3. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 2 is characterized in that The transmission belt is equipped with an adjustable tensioner for adjusting the tension.

4. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 1 is characterized in that The brake seat is fixed on the large box of the ground drive device of the oil production screw pump. The upper brake fixed disc and the lower floating brake disc are vertically and circumferentially slidably matched with the main shaft. Brake friction pads that cooperate with the horizontal brake disc are respectively embedded under the upper brake fixed disc and on the lower floating brake disc.

5. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 1 is characterized in that The hydraulic brake drive mechanism is an overrunning clutch driving hydraulic pump, the hydraulic pump is connected to the oil brake cylinder and the regulating valve through a hydraulic oil output pipe, the hydraulic pump is connected to the hydraulic oil tank through a hydraulic oil input pipe, and the regulating valve is connected to the hydraulic oil tank through a return oil pipe.

6. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 5 is characterized in that After buffering the brake, open the regulating valve and allow part of the hydraulic oil in the hydraulic brake cylinder to flow back to the hydraulic oil tank through the hydraulic oil output pipe, return oil pipe and regulating valve under the pressure of the support spring.

7. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 5 is characterized in that The regulating valve is an overpressure relief valve with a settable overpressure value.

8. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 7 is characterized in that The diameter of the oil return pipe where the overpressure relief valve is located is larger than the diameter of the hydraulic oil output pipe; when the overpressure value is lower than the overpressure value, the overpressure relief valve is closed, and the brake disc is clamped when the hydraulic oil is supplied; when the overpressure value is exceeded, the overpressure relief valve opens, the oil supply pressure drops, and the horizontal brake disc is released; the hydraulic oil is released through the release valve, and then the overpressure relief valve is closed when the overpressure value is lower than the overpressure value, and the brake disc is clamped when the hydraulic oil is supplied. This cycle continues until the torque is released.

9. The double-cylinder balanced hydraulic brake device for the oil production screw pump according to claim 1 is characterized in that The main shaft is provided with a driven sheave above the upper brake fixed plate. The large housing of the ground drive device of the oil production screw pump is provided with a driving motor and an active sheave at the output shaft end thereof through the outward-extending adjustment supports on both sides. The two active sheaves drive the driven sheave together through multiple parallel V-belts. A chassis seat is provided under the large housing. The upper part of the chassis seat cavity is provided with a one-way wheel overrunning clutch driven by the main shaft and a hydraulic pump of the hydraulic brake drive mechanism driven by the one-way wheel overrunning clutch. Alternatively, the main shaft drives a horizontal shaft extending from the opposite side of the large housing of the oil production screw pump surface drive device through a steering transmission mechanism, a driven sheave is provided at one end of the horizontal shaft, a driving motor and a driving sheave at the output shaft end of the driving motor are provided on the side of the large housing adjacent to the driven sheave through an outwardly extending adjustment support, and each driving sheave drives the driven sheave through a plurality of parallel V-belts; the large housing is provided with a one-way wheel overrunning clutch driven by the other end of the horizontal shaft and a hydraulic pump of a hydraulic brake drive mechanism driven by the one-way wheel overrunning clutch on the side opposite to the driven sheave; Alternatively, the main shaft drives a side extension shaft extending from a side of a large housing of a surface drive device of an oil production screw pump through a steering transmission mechanism, and the side extension shaft is fixed with a main sheave and a driven sheave in sequence from the inside to the outside; the main sheave drives the auxiliary sheave through a transmission belt, the auxiliary sheave drives a one-way wheel type overrunning clutch, and the one-way wheel type overrunning clutch drives the hydraulic pump of a hydraulic brake drive mechanism; a chassis is provided under the large housing, and a driving motor and a driving sheave at the output shaft end thereof are provided on an outwardly extending adjustment support of the chassis, and the driving sheave drives the driven sheave through multiple parallel V-belts; Alternatively, the main shaft drives a side extension shaft extending from a side of a large box body of a ground drive device of an oil production screw pump through a steering transmission mechanism, a driven sheave is fixed on the side extension shaft, a base frame is provided under the large box body, a driving motor and an active sheave at the output shaft end of the base frame are provided on an outward-extending adjustment support of the base frame, and the active sheaves drive the driven sheaves through multiple parallel V-belts; a one-way wheel overrunning clutch driven by the main shaft and a hydraulic pump of a hydraulic brake drive mechanism driven by the one-way wheel overrunning clutch are provided on the upper part of the base frame cavity.

10. The double-cylinder balanced hydraulic brake device for a ground-driven oil production screw pump according to claim 9, characterized in that A wellhead seat is set below the base frame seat, and the lower end of the main shaft in the middle of the base frame seat is driven downward to connect the lower section of the main shaft through a markless slip coupling. The lower section of the main shaft passes through the packing sealing box at the bottom of the base frame seat and extends downward into the wellhead seat.

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