Fixed brake wheel type dead-point-free brake device of oil pumping unit and brake method

Abstract

The invention provides a fixed brake wheel type dead-point-free brake device for an oil pumping unit and a brake method. The fixed brake wheel type dead-point-free brake device comprises a brake force arm rod and a rotary fluted disc which are fixed on a speed reducer of the oil pumping unit, the brake force arm rod is matched with the rotating fluted disc to achieve braking and comprises a brake force arm body, a movable clamping block and a limiting structure. An arc-shaped limiting sliding groove is formed in the brake force arm body. The first end of the brake force arm body is hinged to the operating rod, and the second end of the brake force arm body is rotatably connected to the pumping unit speed reducer. The movable clamping block is installed in the arc-shaped limiting sliding groove in a sliding mode. The limiting structure is installed in the arc-shaped limiting sliding groove and is in sliding connection with the movable clamping block. Therefore, the movable clamping block can automatically slide to the locking position where the movable clamping block and the rotary fluted disc are locked in the process of being clamped into the rotary fluted disc, rotation of the brake wheel is limited, braking is achieved, the stability and reliability of braking are kept, operation convenience and efficiency are improved, and the brake device is suitable for popularization and application. And the movable clamping block locks the rotary fluted disc in a self-adaptive manner, so that the braking can be accurately and reliably realized, and the operation safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum machinery accessories, in particular to a dead-point-free braking device of a fixed brake wheel type for an oil pump and a braking method. Background Art

[0002] The brake mechanism of the oil pump usually adopts a brake wheel installed on the input shaft of the reducer and a brake shoe fixed on the reducer, which are connected by an operating mechanism to achieve braking and releasing, which is the main brake mechanism. For greater safety, an auxiliary locking component is also provided. A simpler way is to install a hook on the reducer. When the main brake is applied, the hook is directly clamped in the spacing groove on the brake wheel. One problem with this method is that after the brake is applied, the groove on the wheel may not be exactly aligned with the hook claw. The brake needs to be slightly loosened and the brake wheel slightly rotated to engage the claw. The engagement and disengagement of the claw are both directly operated manually, which is complicated to operate and poses safety risks.

[0003] Therefore, it is necessary to provide a brake mechanism to solve the problems existing in the prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a dead-point-free brake device and a brake method for an oil pump with a fixed brake wheel, so as to at least solve the problem in the prior art that after the brake is set, the brake needs to be manually loosened when the slot is not aligned with the hook claw, resulting in complicated operation and possible safety risks.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a dead-point-free brake device of a fixed brake wheel type for an oil pumping unit, comprising a brake lever arm and a rotating gear disc fixed on a reducer of the oil pumping unit, wherein the rotating gear disc is fixedly connected to the brake wheel; the brake lever arm cooperates with the rotating gear disc to achieve braking, and the brake lever arm comprises: a brake lever arm body, a movable clamping block and a limiting structure; an arc-shaped limiting slide groove is provided on the brake lever arm body, and the curvature of the arc-shaped limiting slide groove matches the curvature of the wheel edge of the rotating gear disc; the first end of the brake lever arm body is hinged to an operating rod, and the second end of the brake lever arm body is rotatably connected to the reducer of the oil pumping unit; the movable clamping block is slidably installed in the arc-shaped limiting slide groove along the extension direction of the arc-shaped limiting slide groove; the limiting structure is installed in the arc-shaped limiting slide groove and is slidably connected to the movable clamping block;

[0006] Among them, the movable clamping block has an initial position sliding along the arc-shaped limiting groove and a locking position moving to both sides; when the first end of the brake arm body moves toward the rotating gear disc to a preset position under the action of external force, the movable clamping block and the rotating gear disc are clamped with each other and driven to the locking position by the rotating gear disc; the limiting structure is used to limit the locking position of the movable clamping block.

[0007] Optionally, the brake lever body includes a lever base and two sealing plates; the first end of the lever base is hinged to the operating rod, and the second end of the lever base is rotatably connected to the oil pump reducer; the two sealing plates are symmetrically installed on both sides of the lever base, and form the arc-shaped limiting groove between the lever base and the lever base.

[0008] Optionally, a plurality of identical tooth grooves are formed between each adjacent tooth of the rotating gear disk, and the movable clamping block includes a guide block and a latching tooth; the guide block is installed in the arc-shaped limiting slide groove, and the arc-shaped top surface edge of the guide block is in contact with the inner arc-shaped surface of the arc-shaped limiting slide groove; the latching tooth is arranged on the bottom surface of the guide block, and the outer dimensions of the latching tooth match the shape of the tooth groove, and the latching tooth is used to be clamped into the tooth groove under the drive of the guide block.

[0009] Optionally, a strip slide groove is opened inside the guide block, and the curvature of the strip slide groove matches the curvature of the wheel edge of the rotating gear disk; the limiting structure includes a limiting pin, both ends of the limiting pin are fixed on the two groups of the sealing plates, and the limiting pin passes through the strip slide groove, and the limiting pin is used to limit the guide block from moving to the locking position in the arc-shaped limiting slide groove.

[0010] Optionally, the brake lever rod further comprises an elastic structure, wherein the elastic structure is respectively connected to the brake lever body and the movable block; the elastic structure is used for resetting the movable block to the initial position.

[0011] Optionally, the elastic structure includes two groups of compression springs, the two groups of compression springs are arranged in the arc-shaped limiting slide groove and correspondingly arranged on both sides of the movable block, and the two ends of each group of compression springs are respectively fixedly installed on an inner wall of the arc-shaped limiting slide groove and the side wall of the movable block; wherein, when the brake is released, the action force of the two groups of compression springs resets the movable block to the initial position.

[0012] Optionally, the inner side walls on both sides of the arc-shaped limiting sliding groove are each provided with a first slot, and the side walls of the movable blocking block opposite to the first slot are each provided with a second slot; the two ends of each group of compression springs are respectively fixedly installed in one of the first slots and a corresponding one of the second slots.

[0013] Optionally, both ends of the strip-shaped slide groove are arcs that precisely match the surface of the limiting pin; and the width of the strip-shaped slide groove precisely matches the diameter of the limiting pin.

[0014] The present application also provides a method for braking a pumping unit with a fixed brake wheel and no dead point, which is applied to the fixed brake wheel and no dead point braking device for the pumping unit described in the present application, and the method comprises:

[0015] When the engine oil needs to be pumped into the braking state, the operating lever is operated so that the operating lever drives the first end of the brake arm body to move toward the rotating gear disc to a preset position;

[0016] The movable clamping block is clamped with the rotating gear disc and is driven by the rotating gear disc from the initial position to the locking position to lock the rotating gear disc;

[0017] When the brake state needs to be released during the pumping of the engine oil, the operating lever is operated in the reverse direction, so that the operating lever drives the first end of the brake arm body to leave the preset position, and the movable block gradually disengages from the rotating gear disc;

[0018] After the movable clamping block is disengaged from the rotating gear disc, the movable clamping block is reset from the locking position to the initial position.

[0019] The present invention provides a dead-point-free brake device and a braking method for an oil pumping unit with a fixed brake wheel, comprising a brake lever and a rotating gear plate fixed on a reducer of the oil pumping unit, wherein the rotating gear plate is fixedly connected to the brake wheel; the brake lever cooperates with the rotating gear plate to achieve braking, and the brake lever comprises a brake lever body, a movable clamping block and a limiting structure; an arc-shaped limiting groove is provided on the brake lever body, and the arc of the arc-shaped limiting groove matches the arc of the wheel edge of the rotating gear plate; the first end of the brake lever body is hinged to the operating rod, and the second end of the brake lever body can be rotatably connected to the operating rod. The invention is connected to the reducer of the oil pump; the movable clamping block is slidably installed in the arc-shaped limiting sliding groove along the extension direction of the arc-shaped limiting sliding groove; the limiting structure is installed in the arc-shaped limiting sliding groove and is slidably connected with the movable clamping block; wherein the movable clamping block has an initial position sliding along the arc-shaped limiting sliding groove and a locking position moving to both sides; when the first end of the brake arm body moves to a preset position toward the rotating toothed disc under the action of an external force, the movable clamping block and the rotating toothed disc are mutually clamped and driven to the locking position by the rotating toothed disc; the limiting structure is used to limit the locking position of the movable clamping block. Thus, the movable clamping block can automatically slide to a locking position locked with the rotating toothed disc during the process of being clamped into the rotating toothed disc, so that at any rotation position of the rotating toothed disc, the movable clamping block can be clamped into the rotating toothed disc and locked with the rotating toothed disc, thereby limiting the rotation of the brake wheel, achieving braking, and maintaining the stability and reliability of the brake, thereby improving the convenience and efficiency of the operation, and the movable clamping block adaptively locks the rotating toothed disc to ensure that the brake can be accurately and reliably realized, thereby improving the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of a dead-point-free brake device of a pumping unit with a fixed brake wheel, which can be selected according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of a brake lever arm which can be selected according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] 10. Brake lever arm; 11. Brake lever body; 111. Lever base; 112. Closing plate; 12. Movable clamping block; 121. Guide block; 122. Clamping teeth; 13. Limiting structure; 131. Limiting pin; 14. Elastic structure; 141. Compression spring; 20. Rotating gear disc; 30. Fixed pin shaft. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] like Figure 1 As shown, a dead-point-free brake device of a pumping unit with a fixed brake wheel comprises a brake lever 10 and a rotating toothed disc 20 fixed on a reducer of the pumping unit, wherein the rotating toothed disc 20 is fixedly connected to the brake wheel; the brake lever 10 cooperates with the rotating toothed disc 20 to achieve braking, and the brake lever 10 comprises a brake lever body 11, a movable clamping block 12 and a limiting structure 13; an arc-shaped limiting groove is provided on the brake lever body 11, and the curvature of the arc-shaped limiting groove matches the curvature of the wheel edge of the rotating toothed disc 20; the first end of the brake lever body 11 is hinged to the operating rod, and the second end of the brake lever body 11 is rotatably connected to the operating rod. On the oil pump reducer; the movable clamping block 12 is slidably installed in the arc-shaped limiting groove along the extension direction of the arc-shaped limiting groove; the limiting structure 13 is installed in the arc-shaped limiting groove and is slidably connected with the movable clamping block 12; wherein, the movable clamping block 12 has an initial position sliding along the arc-shaped limiting groove and a locking position moving to both sides; when the first end of the brake arm body 11 moves toward the rotating gear disc 20 to a preset position under the action of external force, the movable clamping block 12 and the rotating gear disc 20 are clamped with each other and driven to the locking position by the rotating gear disc 20; the limiting structure 13 is used to limit the locking position of the movable clamping block 12.

[0027] Specifically, the rotating toothed disc 20 is fixedly connected to the rotating toothed disc of the brake wheel of the oil pumping unit through positioning bolts, so that the braking force acting on the rotating toothed disc 20 is directly transmitted to the brake wheel. That is, when the rotating toothed disc is restricted from rotating, the brake wheel also stops rotating, so that the oil pumping unit brakes and stops working. When the movable clamping block 12 is not in contact with the rotating toothed disc 20, the movable clamping block 12 is always in the set position of the arc-shaped limiting groove, and the set position is the initial position. The arc-shaped limiting groove allows the movable clamping block 12 to move only along the arc of the arc-shaped limiting groove, so that it can match the wheel edge of the rotating toothed disc 20 more smoothly. Among them, the first end of the brake arm body 11 is hinged with the operating rod on the oil pumping unit, and a fixed pin shaft 30 is fixedly installed on the oil pumping unit reducer. The second end of the brake arm body 11 is rotatably sleeved on the outer surface of the fixed pin shaft 30. When the force of the operating rod acts on the first end of the brake arm body 11, the second end of the brake arm body 11 is driven to rotate around the fixed pin shaft 30.

[0028] When the movable clamping block 12 is in contact with the rotating toothed disc 20 and subjected to force, the movable clamping block 12 moves until it is locked with the rotating toothed disc 20. At this time, the position of the movable clamping block 12 is the locking position. The movable clamping block 12 can move in different directions according to the rotation position of the rotating toothed disc 20, so there are two locking positions, and the initial position is located between the two locking positions. Sometimes the initial position is the same as the locking position.

[0029] In the present application, an arc-shaped limiting groove is provided on the brake arm body 11, and the curvature of the arc-shaped limiting groove matches the wheel edge of the rotating gear disc 20. The movable clamping block 12 is installed along the sliding of the arc-shaped limiting groove, that is, the movable clamping block 12 slides around the wheel edge of the rotating gear disc during the clamping process with the rotating gear disc 20. Among them, a limiting structure 13 is installed in the arc-shaped limiting groove, and the limiting structure 13 limits the sliding position of the movable clamping block 12 in the arc-shaped limiting groove. When the brake arm body 11 moves to a preset position toward the rotating gear disc 20 under the force of the operating rod at the first end, the movable clamping block 12 slides in the arc-shaped limiting groove with the center of the rotating gear disc 20 as the center under the limitation of the limiting structure 13, and then clamps into the rotating gear disc 20 to achieve locking. Since the movable clamping block 12 can slide to a locking position with the rotating gear disc 20 during the process of being inserted into the rotating gear disc 20, the movable clamping block 12 can be inserted into the rotating gear disc 20 and locked with the rotating gear disc 20 at any rotation position of the rotating gear disc 20, thereby limiting the rotation of the brake wheel, achieving braking, and maintaining the stability and reliability of the brake. The operator does not need to perform cumbersome manual fine-tuning before braking, and can achieve braking with simple operations, which greatly improves the convenience and efficiency of operation. Moreover, the adaptive locking of the rotating gear disc 20 by the movable clamping block 12 ensures that braking can be achieved accurately and reliably regardless of the position of the rotating gear disc, reducing the risk of brake failure caused by improper operation and improving operational safety.

[0030] In a possible embodiment, the brake arm body 11 includes an arm base 111 and two sealing plates 112; the first end of the arm base 111 is hinged to the operating rod, and the second end of the arm base 111 is rotatably connected to the oil pump reducer; the two sealing plates 112 are symmetrically installed on both sides of the arm base 111, and form an arc-shaped limiting groove between the arm base 111.

[0031] Specifically, the brake arm body 11 is composed of an arm base 111 and two sealing plates 112, and the manufacturing process is simpler. In addition, the movable block 12 can be more conveniently installed in the arc-shaped limit slot. During installation, the sealing plate 112 on one side is first installed, and then the movable block 12 is placed in the arc-shaped limit slot, and then the sealing plate 112 on the other side is installed, so that the movable block 12 is restricted in the arc-shaped limit slot. In addition, when one of the arm base 111 and the two sealing plates 112 is damaged or needs to be repaired, it can be replaced or repaired separately, which can reduce maintenance costs and difficulties.

[0032] In a possible embodiment, a plurality of identical tooth grooves are formed between each adjacent tooth of the rotating gear disk 20, and the movable clamping block 12 includes a guide block 121 and a latching tooth 122; the guide block 121 is installed in an arc-shaped limiting groove, and the arc-shaped top surface edge of the guide block 121 fits with the inner arc-shaped surface of the arc-shaped limiting groove; the latching tooth 122 is arranged on the bottom surface of the guide block 121, and the outer dimensions of the latching tooth 122 match the shape of the tooth groove, and the latching tooth 122 is used to be clamped into the tooth groove under the drive of the guide block 121.

[0033] Specifically, Figure 2 As shown, the guide block 121 is in the arc-shaped limiting groove, and the edge of the arc-shaped top surface of the guide block 121 fits with the inner arc surface of the arc-shaped limiting groove so that the guide block 121 moves and slides along the inner arc surface of the arc-shaped limiting groove. The latch 122 is fixed to the bottom surface of the guide block 121 and is located outside the arc-shaped limiting groove. When the guide block 121 slides along the inner arc surface of the arc-shaped limiting groove, it drives the latch 122 to move along the same path. The outer circle of the rotating gear disk 20 is evenly distributed with multiple teeth, and a tooth groove is formed between each adjacent tooth, that is, the wheel edge of the rotating gear disk 20 forms multiple tooth grooves. The outer dimensions of the latch 122 match the tooth groove. When the outer shape of the latch 122 is completely matched with the tooth groove, the latch 122 is clamped with the tooth groove. Among them, the guide block 121 and the latch 122 are cast as one piece.

[0034] In a possible embodiment, a strip slide groove is opened inside the guide block 121, and the curvature of the strip slide groove matches the curvature of the wheel edge of the rotating gear disk 20; the limiting structure 13 includes a limiting pin 131, both ends of the limiting pin 131 are fixed on two sets of sealing plates 112, and the limiting pin 131 passes through the strip slide groove, and the limiting pin 131 is used to limit the guide block 121 to move to a locked position in the arc-shaped limiting slide groove.

[0035] Specifically, both ends of the limit pin 131 are fixed on the two sets of sealing plates 112, and the limit pin 131 passes through the strip slide. The limit pin 131 limits the guide block 121 in the arc-shaped limit slide, and the limit pin 131 cooperates with the strip slide so that the longest sliding distance of the guide block 121 in the arc-shaped limit slide is the length of the strip slide, and limits the guide block 121 to move to the locked position in the arc-shaped limit slide, and can also limit the guide block 121 from moving from the locked position to the initial position.

[0036] In a possible implementation manner, the brake lever 10 further includes an elastic structure 14 , which is respectively connected to the brake lever body 11 and the movable block 12 ; the elastic structure 14 is used to reset the movable block 12 to an initial position.

[0037] Specifically, the elastic structure 14 is connected to the brake arm body 11 and the movable block 12 respectively, and the automatic resetting function of the movable block 12 can be realized. When the brake state is released, the movable block 12 leaves the position clamped with the tooth groove of the rotating gear plate 20, and the elastic structure 14 can provide a restoring force to automatically pull the movable block 12 back to the initial position. The stability and reliability of the brake system can be improved and the operation process can be simplified. Moreover, the automatic resetting of the movable block 12 under the action of the elastic structure 14 can also reduce manual operation and improve safety.

[0038] In a possible implementation, the elastic structure 14 includes two groups of compression springs 141, which are arranged in the arc-shaped limiting slide groove and correspondingly arranged on both sides of the movable block 12, and the two ends of each group of compression springs 141 are respectively fixedly installed on an inner side wall of the arc-shaped limiting slide groove and a side wall of the movable block 12;

[0039] When the brake is released, the force of the two sets of compression springs 141 causes the movable block 12 to return to the initial position.

[0040] Specifically, a group of compression springs 141 are respectively provided on both sides of the movable block 12. The compression spring 141 has a clear restoring force and restoring direction, which can ensure that the movable block 12 is quickly and accurately reset to the initial position after the brake state is released. Moreover, the elasticity and restoring force of the compression spring 141 can be adjusted according to actual needs to adapt to different operating requirements. In addition, compared with other complex elastic structures, the cost of compression springs is relatively low and easy to purchase and install. This helps to reduce the overall cost of the brake system and has a high cost performance.

[0041] In a possible implementation, a first slot is provided on both inner side walls of the arc-shaped limiting slide groove, and a second slot is provided on the side wall of the movable block 12 opposite to the first slot; the two ends of each group of compression springs 141 are respectively fixedly installed in a first slot and a corresponding second slot.

[0042] Specifically, the inner side wall of the arc-shaped limiting slide groove is provided with a first slot for installing one end of a group of compression springs 141, and the side wall of the movable clamping block 12 corresponding to the first slot is provided with a second slot for installing the other end of the compression spring 141. The first slot and the second slot provide a clear installation position for the compression spring 141, ensuring that the two ends of the compression spring 141 can be stably fixed on the brake arm body 11 and the movable clamping block 12, avoiding the loosening or misalignment of the compression spring 141 during the installation process, and ensuring the normal operation and long-term reliability of the compression spring. In addition, the first slot and the second slot not only provide an installation position for the compression spring, but also enhance the structural stability between the brake arm body 11 and the movable clamping block 12, and can prevent the movable clamping block from shaking or shifting during the force application process, thereby improving the overall stability and safety of the brake system.

[0043] In a possible implementation manner, both ends of the strip-shaped slide groove are arcs that precisely match the surface of the limiting pin 131 ; and the width of the strip-shaped slide groove precisely matches the diameter of the limiting pin 131 .

[0044] Specifically, the width of the strip chute is precisely matched with the diameter of the limit pin 131, which can reduce the shaking or deviation of the movable block 12 during movement, thereby improving the overall accuracy and reliability of the brake system. When the movable block 12 slides to the point where the strip chute contacts the limit pin 131, the arc of the end surface of the strip chute is precisely matched with the outer surface of the limit pin 131, further improving stability.

[0045] The present application also provides a method for braking a pumping unit with a fixed brake wheel and no dead point, which is applied to the fixed brake wheel and no dead point braking device of the pumping unit in the present application, and the method comprises:

[0046] When the engine oil needs to be pumped into the braking state, the operating lever is operated so that the operating lever drives the first end of the brake arm body 11 to move toward the rotating gear disc 20 to a preset position;

[0047] The movable clamping block 12 is clamped with the rotating gear disc 20 and is driven by the rotating gear disc 20 from the initial position to the locking position to lock the rotating gear disc 20;

[0048] When the brake state needs to be released during the pumping of the engine oil, the operating lever is operated in the reverse direction, so that the operating lever drives the first end of the brake arm body 11 to leave the preset position, and the movable block 12 gradually disengages from the rotating gear disc 20;

[0049] After the movable clamping block 12 is separated from the rotating gear disc 20 , the movable clamping block 12 is reset from the locking position to the initial position.

[0050] Specifically, when the engine oil needs to be pumped into the braking state, the operating lever is manipulated, and the operating lever immediately generates a mechanical linkage to drive the first end of the brake arm body 11 to move toward the rotating sprocket 20 until it reaches the preset braking position.

[0051] The interaction between the movable block 12 and the rotating gear disc 20 is rapid and precise. The movable block 12 is tightly inserted into the preset slot of the rotating gear disc 20 and is firmly driven from the initial position to the locked position by the mechanical structure of the rotating gear disc 20. This process ensures that the rotating gear disc 20 is completely locked and cannot rotate.

[0052] When the brake state needs to be released during oil extraction, the operating lever is manipulated in the opposite direction to the direction of manipulation when braking is required, so that the first end of the brake arm body 11 gradually leaves the preset braking position reached previously, and begins to release the braking pressure on the rotating sprocket 20.

[0053] As the operating lever continues to be operated in the reverse direction, the clamping state between the movable clamping block 12 and the rotating gear disc 20 gradually weakens until the movable clamping block 12 is completely disengaged from the tooth groove of the rotating gear disc 20, at which time the locking state of the rotating gear disc 20 is released.

[0054] Once the movable clamping block 12 is completely separated from the rotating toothed disc 20, the reset mechanism is immediately activated to quickly reset the movable clamping block 12 from the locked position to its initial position, so as to prepare for the next braking operation.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dead-point-free brake device of a pumping unit with a fixed brake wheel, comprising a brake lever arm (10) and a rotating toothed disc (20) fixed on a reducer of the pumping unit, characterized in that: The rotating toothed disc (20) is fixedly connected to the brake wheel; the brake lever arm (10) cooperates with the rotating toothed disc (20) to achieve braking, and the brake lever arm (10) comprises: A brake arm body (11), wherein the brake arm body (11) is provided with an arc-shaped limit sliding groove, the arc of the arc-shaped limit sliding groove matches the arc of the wheel edge of the rotating gear plate (20); the first end of the brake arm body (11) is hinged to the operating rod, and the second end of the brake arm body (11) is rotatably connected to the oil pump reducer; A movable clamping block (12) is slidably mounted in the arc-shaped limiting sliding groove along the extension direction of the arc-shaped limiting sliding groove; A limiting structure (13), installed in the arc-shaped limiting sliding groove and slidably connected to the movable clamping block (12); Wherein, the movable clamping block (12) has an initial position sliding along the arc-shaped limiting groove and a locking position moving to both sides; when the first end of the brake arm body (11) moves toward the rotating gear disc (20) to a preset position under the action of an external force, the movable clamping block (12) and the rotating gear disc (20) are clamped with each other and driven to the locking position by the rotating gear disc (20); the limiting structure (13) is used to limit the locking position of the movable clamping block (12).

2. The dead-point-free brake device of a pumping unit with a fixed brake wheel according to claim 1, characterized in that: The brake arm body (11) comprises: A lever base (111), wherein a first end of the lever base (111) is hinged to the operating rod, and a second end of the lever base (111) is rotatably connected to the pumping unit reducer; Two sealing plates (112) are symmetrically mounted on both sides of the lever arm base (111), and form the arc-shaped limiting sliding groove between the two sealing plates and the lever arm base (111).

3. The dead-point-free brake device of a pumping unit with a fixed brake wheel according to claim 2, characterized in that: A plurality of identical tooth grooves are formed between each adjacent tooth of the rotating toothed disc (20), and the movable clamping block (12) comprises: A guide block (121), wherein the guide block (121) is installed in the arc-shaped limiting sliding groove, and the edge of the arc-shaped top surface of the guide block (121) is in contact with the inner arc-shaped surface of the arc-shaped limiting sliding groove; A latching tooth (122), wherein the latching tooth (122) is arranged on the bottom surface of the guide block (121), the outer dimensions of the latching tooth (122) match the shape of the tooth groove, and the latching tooth (122) is used to be latched into the tooth groove under the drive of the guide block (121).

4. The dead-point-free brake device of a pumping unit with a fixed brake wheel according to claim 3, characterized in that: The guide block (121) is provided with a strip-shaped slide groove inside, and the curvature of the strip-shaped slide groove matches the curvature of the wheel edge of the rotating toothed disc (20); the limiting structure (13) comprises: A limit pin (131), both ends of which are fixedly mounted on the two sets of sealing plates (112), and the limit pin (131) passes through the strip-shaped slide groove, and the limit pin (131) is used to limit the guide block (121) from moving to the locking position in the arc-shaped limit slide groove.

5. The dead-point-free brake device of a pumping unit with a fixed brake wheel according to claim 3, characterized in that: The brake lever (10) further comprises: An elastic structure (14), wherein the elastic structure (14) is respectively connected to the brake arm body (11) and the movable clamping block (12); the elastic structure (14) is used to reset the movable clamping block (12) to the initial position.

6. The dead-point-free brake device of a fixed brake wheel type for an oil pump according to claim 5, characterized in that: The elastic structure (14) comprises: Two groups of compression springs (141), the two groups of compression springs (141) are arranged in the arc-shaped limiting sliding groove and are correspondingly arranged on both sides of the movable clamping block (12), and the two ends of each group of compression springs (141) are respectively fixedly mounted on an inner side wall of the arc-shaped limiting sliding groove and a side wall of the movable clamping block (12); Wherein, in the brake release state, the action force of the two groups of compression springs (141) causes the movable clamping block (12) to return to the initial position.

7. The dead-point-free brake device of a pumping unit with a fixed brake wheel according to claim 6, characterized in that: The inner side walls on both sides of the arc-shaped limiting sliding groove are each provided with a first clamping groove, and the side wall of the movable clamping block (12) opposite to the first clamping groove is each provided with a second clamping groove; the two ends of each group of the compression springs (141) are respectively fixedly installed in one of the first clamping grooves and a corresponding one of the second clamping grooves.

8. The dead-point-free brake device of a pumping unit with a fixed brake wheel according to claim 4, characterized in that: The two ends of the strip-shaped slide groove are arcs that precisely match the surface of the limiting pin (131); and the width of the strip-shaped slide groove precisely matches the diameter of the limiting pin (131).

9. A method for braking a pumping unit with a fixed brake wheel and no dead point, characterized in that: The method for the dead-point-free brake device with a fixed brake wheel for an oil pumping unit according to any one of claims 1 to 8 comprises: When the engine oil needs to be pumped into a braking state, the operating lever is operated so that the operating lever drives the first end of the brake arm body (11) to move toward the rotating gear disc (20) to a preset position; The movable clamping block (12) and the rotating toothed disc (20) are clamped together and driven by the rotating toothed disc (20) from an initial position to a locking position to lock the rotating toothed disc (20); When the brake state needs to be released for pumping oil, the operating lever is operated in the reverse direction, so that the operating lever drives the first end of the brake arm body (11) to leave the preset position, and the movable block (12) gradually disengages from the rotating gear disc (20); After the movable clamping block (12) is disengaged from the rotating toothed disc (20), the movable clamping block (12) is reset from the locking position to the initial position.

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