A braking system for a drainage robot

Abstract

The present invention relates to a drainage robot braking system. The drainage robot braking system comprises: a cylinder; a driving device, comprising a driving motor and a transmission shaft, the driving motor is connected to the transmission shaft in a transmission manner; a transmission wheel, which is located in the cylinder and fixed on the transmission shaft to move along the circumference of the cylinder with the transmission shaft, and the end of the transmission wheel is provided with a diameter-changing groove, and the diameter-changing groove has at least two transmission groove wall sections in the circumference of the transmission wheel, and the transmission groove wall sections gradually approach the center line of the transmission wheel in the circumference of the transmission wheel; a brake block, which is arranged outside the cylinder, and at least two brake blocks are arranged along the circumference of the cylinder, and a brake convex portion is provided on the outer surface of the brake block, and both side surfaces of the brake convex portion in the axial direction of the cylinder are inclined surfaces; a reset elastic member, which is arranged between the cylinder and the corresponding brake block, and is used to apply an elastic force to the brake block to make it move away from the cylinder; a transmission hook, which is fixed on the corresponding brake block, and the transmission hook has a hook head, which is located in the diameter-changing groove and hooked on the corresponding transmission groove wall section.

Description

Technical Field

[0001] The invention relates to a braking system for a drainage robot. Background Art

[0002] Plunger gas lift has been widely used as a water drainage gas production technology. This method can reduce bottom hole liquid accumulation and extend the production time of gas wells. Moreover, it can be used in oil and gas wells that are prone to wax and scale formation, eliminating the process of cleaning wax and scale.

[0003] The plungers currently in operation basically ignore speed control. During the drainage process, due to the continuous increase in well depth, when the plunger is in a state of almost free fall when it descends, when the plunger touches the liquid surface or reaches the bottom of the well, it will inevitably produce excessive impact on itself and the bottom of the well buffer, thereby destroying the plunger or the buffer and causing serious downhole accidents. When the plunger is ascending, the high-pressure gas at the bottom of the well forms a continuous lifting force on the plunger. During the continuous discharge of the liquid on the top of the plunger, the plunger will continue to accelerate upward. When it reaches the wellhead position, it will also collide with the wellhead blowout preventer due to excessive speed, damaging the plunger or the wellhead blowout preventer, posing a major safety hazard. Summary of the invention

[0004] The object of the present invention is to provide a drainage robot braking system to solve the technical problem in the prior art that a plunger will generate a large impact when moving upward and downward.

[0005] To achieve the above purpose, the technical solution of the drainage robot braking system of the present invention is:

[0006] The braking system of the drainage robot comprises a cylinder body, in which a driving device and a transmission wheel are arranged, the driving device comprises a driving motor and a transmission shaft, the driving motor is connected to the transmission shaft for driving the transmission shaft to move circumferentially along the cylinder body; the transmission wheel is fixed on the transmission shaft for moving circumferentially along the cylinder body with the transmission shaft, a reducing groove is arranged at the end of the transmission wheel, the reducing groove has at least two transmission groove wall sections in the circumferential direction of the transmission wheel, the transmission groove wall sections gradually approach or move away from the center line of the transmission wheel in the circumferential direction of the transmission wheel; a brake block is arranged on the outside of the cylinder body, at least two brake blocks are arranged along the circumference of the cylinder body, a brake convex portion is arranged on the outer side surface of the brake block, and both side surfaces of the brake convex portion in the axial direction of the cylinder body are inclined surfaces; a transmission hook is arranged on the brake block, and the transmission hook has a hook head, which is located in the reducing groove and hooked on the corresponding transmission groove wall section; a reset elastic member is arranged between the cylinder body and the corresponding brake block, and the reset elastic member is used to apply an elastic force to the brake block to make it move away from the cylinder body.

[0007] The beneficial effect is that the drainage robot braking system of the present invention can adjust the radial movement of the brake block in real time according to the current operating state and well conditions through the cooperation of the transmission shaft and the reset elastic part, thereby controlling the operating speed of the drainage robot, effectively avoiding excessive impact force when the drainage robot reaches the extreme position, preventing the drainage robot from being damaged, and increasing the service life of the drainage robot. At the same time, it protects the bottom of the well and the wellhead equipment, greatly reducing the safety production accidents caused by high-speed impacts.

[0008] As a further improvement, the transmission groove wall section includes a first groove wall unit and a second groove wall unit, and the change rate of the first groove wall unit approaching or moving away from the center line of the transmission wheel is smaller than the change rate of the second groove wall unit approaching or moving away from the center line of the transmission wheel.

[0009] The beneficial effect is that such a design can quickly adjust the movement of the brake block along the radial direction of the cylinder, thereby realizing rapid opening and closing of the brake system.

[0010] As a further improvement, two transmission groove wall sections are provided, and the two transmission groove wall sections are centrally symmetrical structures.

[0011] The beneficial effect is that such a design is conducive to the stability and uniformity of the force during braking.

[0012] As a further improvement, the opening of the reducing groove faces the drive motor, the transmission wheel is sleeved on the transmission shaft from the end of the transmission shaft away from the drive motor, and the transmission wheel and the transmission shaft are assembled together to prevent rotation.

[0013] The beneficial effect is that such a design makes it easy to install the variable diameter wheel on the transmission shaft.

[0014] As a further improvement, the transmission hook is a U-shaped structure.

[0015] The beneficial effect is that such a design is conducive to ensuring the uniformity of the force applied to the brake block.

[0016] As a further improvement, the resetting elastic member is a compression spring.

[0017] The beneficial effect is that such a design makes it easy to install the resetting elastic member between the cylinder and the corresponding brake block.

[0018] As a further improvement, a compression spring positioning groove is provided on the cylinder and / or the corresponding brake block, and the end of the compression spring is installed in the compression spring positioning groove.

[0019] The beneficial effect is that such a design can ensure the stability of the compression spring during its expansion and contraction process.

[0020] As a further improvement, the inclined surface is a straight inclined surface.

[0021] The beneficial effect is that such a design facilitates the processing of the inclined surface.

[0022] As a further improvement, the hook head is a cylindrical structure.

[0023] As a further improvement, at least two resetting elastic members are provided between the cylinder and the corresponding brake block.

[0024] The beneficial effect is that such a design can ensure that the brake block is ejected outwards. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the drainage robot when the braking system of the present invention is closed;

[0026] Figure 2 It is a structural schematic diagram of the brake block being at the coupling when the brake system of the drainage robot of the present invention is turned on;

[0027] Figure 3 It is a structural schematic diagram of the brake block being above the coupling when the brake system of the drainage robot of the present invention is turned on;

[0028] Figure 4 for Figure 1 Schematic diagram of the structure of the middle and upper cylinder;

[0029] Figure 5 for Figure 1 A schematic diagram of the structure of the middle brake block and the transmission hook;

[0030] Figure 6 for Figure 1 The structural diagram of the middle transmission wheel;

[0031] Figure 7 for Figure 6 Bottom view of

[0032] Figure 8 for Figure 1 Middle AA section view;

[0033] In the figure: 101, driving bin; 102, driving motor; 103, lower cylinder; 104, coupling; 105, oil pipe; 106, upper cylinder; 107, transmission shaft; 108, lower limit sleeve; 109, compression spring; 110, coupling gap; 111, transmission hook; 112, brake block; 113, transmission wheel; 114, upper limit sleeve; 115, retaining ring; 116, avoidance hole; 117, first compression spring positioning groove; 118, limit groove; 119, hook head; 120, brake convex part; 121, second compression spring positioning groove; 122, limit protrusion; 123, small diameter section; 124, large diameter section; 125, first slot wall unit; 126, second slot wall unit; 127, stop hole; 128, transmission slot wall section. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0036] It should be noted that the relational terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. In addition, the terms "front", "back", "up", "down", "left" and "right" are based on the orientation and positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention, rather than indicating that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0037] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0038] Embodiment 1 of the drainage robot braking system of the present invention:

[0039] like Figure 1 As shown, the braking system of the drainage robot includes a cylinder, which is arranged in the oil pipe 105 along the up and down direction. The cylinder includes an upper cylinder 106 and a lower cylinder 103, and the upper cylinder 106 and the lower cylinder 103 are threadedly connected together.

[0040] In this embodiment, the inner cavity of the lower cylinder 103 constitutes a driving chamber 101, and a driving motor 102 and a coupling 104 are provided in the driving chamber 101. The driving motor 102 is connected to the transmission shaft 107 through the coupling 104 to drive the transmission shaft 107 to move along the circumference of the cylinder.

[0041] In this embodiment, a transmission wheel 113 is provided in the inner cavity of the upper cylinder 106, and the transmission wheel 113 is fixed on the transmission shaft 107 to move along the axial direction of the cylinder with the transmission shaft 107. Figure 1 and Figure 7 As shown, the transmission wheel 113 has a stop hole 127, which extends axially along the transmission wheel 113. The transmission wheel 113 is mounted on the transmission shaft 107, and the transmission wheel 113 and the transmission shaft 107 are assembled together to stop rotation, and the transmission wheel 113 is limited by the retaining ring 115 to limit the axial movement of the transmission wheel 113 on the transmission shaft 107.

[0042] like Figure 1 and Figure 4 As shown, a lower limit sleeve 108 and an upper limit sleeve 114 are provided on the upper cylinder 106 , and a mounting groove is formed between the two limit sleeves. A brake block 112 is installed in the mounting groove. The brake block 112 is arranged outside the upper cylinder 106 , and two brake blocks 112 are arranged along the circumference of the upper cylinder 106 .

[0043] In this embodiment, the bottom of the installation groove is provided with an avoidance hole 116, a first compression spring positioning groove 117 and a limiting groove 118; each brake block 112 corresponds to one avoidance hole 116, and the avoidance hole 116 is located in the middle position of the installation groove in the axial direction of the upper cylinder 106; each brake block 112 corresponds to two first compression spring positioning grooves 117, and the two first compression spring positioning grooves 117 are located on both sides of the avoidance hole 116 in the axial direction of the upper cylinder 106; each brake block 112 corresponds to two limiting grooves 118, and the two limiting grooves 118 are located on both sides of the avoidance hole 116 in the axial direction of the upper cylinder 106. Among them, the first compression spring positioning groove 117 is between the avoidance hole 116 and the corresponding limiting groove 118.

[0044] like Figure 1 and Figure 5 As shown, the brake block 112 is provided with limiting protrusions 122 at both ends of the upper cylinder 106 in the axial direction. After the limiting protrusion 122 is inserted into the limiting groove 118, the lower limiting sleeve 108 and the upper limiting sleeve 114 cooperate to make the brake block 112 float and be assembled on the upper cylinder 106.

[0045] In this embodiment, a second compression spring positioning groove 121 is provided on the inner side surface of the brake block 112, and two second compression spring positioning grooves 121 are provided, and the second compression spring positioning grooves 121 are arranged one-to-one with the first compression spring positioning groove 117; a compression spring 109 is provided between the brake block 112 and the upper cylinder 106, and the compression spring 109 is used to apply an elastic force to the brake block 112 to make it move away from the upper cylinder 106; one end of the compression spring 109 is installed in the first compression spring positioning groove 117, and the other end of the compression spring 109 is installed in the second compression spring positioning groove 121, so as to ensure the stability of the compression spring 109 during the expansion and contraction process. Among them, the compression spring 109 constitutes a reset elastic member.

[0046] In this embodiment, a braking protrusion 120 is provided on the outer side of the braking block 112, and both sides of the braking protrusion 120 in the axial direction of the upper cylinder 106 are inclined surfaces, so that after the braking block 112 hits an obstacle, the braking block 112 is easy to retract, and the drainage and gas production plunger is prevented from getting stuck when running in the well. Among them, the inclined surface is a straight inclined surface for easy processing. In other embodiments, the inclined surface can be an arc-shaped inclined surface.

[0047] In this embodiment, a transmission hook 111 is fixed on the inner side of the brake block 112, and the transmission hook 111 is located between the two second compression spring positioning grooves 121. A hook head 119 is provided at one end of the transmission hook 111 away from the brake block 112. The hook head 119 is a cylindrical structure.

[0048] like Figure 1 , Figure 6 , Figure 7 as well as Figure 8 As shown, a diameter reducing groove is provided at the end of the transmission wheel 113, the notch of the diameter reducing groove faces the drive motor 102, and the diameter reducing groove has two transmission groove wall sections 128 in the circumferential direction of the transmission wheel 113, and the transmission groove wall sections 128 gradually approach the center line of the transmission wheel 113 in the circumferential direction (clockwise) of the transmission wheel 113. Among them, the two transmission groove wall sections 128 are centrally symmetrical structures.

[0049] In this embodiment, the transmission hook 11 is in a U-shaped structure as a whole, and the hook head 119 enters the reducing groove from the notch of the reducing groove and is hooked on the transmission groove wall section 128 .

[0050] In this embodiment, the transmission groove wall section 128 includes a first groove wall unit 125 and a second groove wall unit 126, and the change rate of the first groove wall unit 125 close to the center line of the transmission wheel 113 is smaller than the change rate of the second groove wall unit 126 close to the center line of the transmission wheel 113. The transmission shaft 107 passes through the transmission wheel 113, and the upper end of the transmission shaft 107 is used to open and close the flow channel valve.

[0051] In this embodiment, the transmission wheel 113 includes a small diameter section 123 and a large diameter section 124. The transmission groove is arranged on the large diameter section 124. The length of the small diameter section 123 is longer, so that the contact area between the transmission shaft 107 and the transmission wheel 113 is larger, thereby ensuring the stability of power transmission; moreover, the transmission wheel 113 is longer as a whole, which is conducive to installing the transmission wheel 113 into the upper cylinder 106.

[0052] like Figure 7 As shown, the large diameter section 124 is not a complete cylinder, so that a larger gap is formed in a partial area between the large diameter section 124 and the upper cylinder 106, so that sand or dirt entering the upper cylinder 106 can fall through the gap, avoiding the variable diameter wheel 113 from getting stuck when rotating.

[0053] During the up and down operation, when the sensor detects that the current running speed exceeds the set value, the drive motor 102 is controlled to rotate forward through the signal, and the coupling 104 drives the transmission wheel 113 to rotate forward. Under the action of the compression spring 109, the transmission hook 111 moves radially outward along the cylinder, and the hook head 119 corresponds to the position of the second groove wall unit 126 farthest from the center line of the transmission shaft 107. At this time, Figure 2 and Figure 3 As shown, the brake block 112 can be opened to the maximum, so that the brake protrusion 120 and the oil pipe 105 generate friction and the brake protrusion 120 and the coupling gap 110 generate hooking to achieve braking, thereby reducing the running speed of the robot, wherein the hooking of the brake protrusion 120 and the coupling gap 110 is the main braking force; when the sensor detects that the current running speed is lower than the set value, the drive motor 102 is reversed through signal control, the coupling 104 drives the transmission wheel 113 to rotate in the opposite direction, the second groove wall unit 126, the first groove wall unit 125 and the hook head 119 are pushed and matched in turn to overcome the elastic force of the compression spring 109, and then drive the transmission hook 111 to move radially inward along the cylinder. At this time, the hook head 119 is hooked at the set position of the first groove wall unit 125, so that the brake block 112 is contracted to the minimum to avoid friction with the oil pipe 105, and the running speed is increased under the action of the bottom hole pressure.

[0054] like Figure 2 As shown, for low-yield gas wells, when the sensor detects that the lifting pressure is insufficient, the drive motor 102 is controlled to rotate forward through a signal, and the brake block 112 is rebounded to the maximum, so that the brake protrusion 120 of the brake block 112 is stuck in the coupling gap 110, thereby realizing energy storage; when the sensor detects that the lifting pressure reaches the set value, the drive motor 102 is controlled to reverse through a signal, so that the brake block 112 shrinks to the minimum, thereby realizing the continued upward movement of the drainage and gas production plunger and avoiding falling to the bottom of the well.

[0055] The drainage robot braking system of the present invention can adjust the radial movement of the brake block in real time according to the current operating state and well conditions, control the operating speed of the drainage robot, effectively avoid excessive impact force when the drainage robot reaches the extreme position, prevent the drainage robot from being damaged, and increase the service life of the drainage robot. At the same time, it protects the bottom of the well and the wellhead equipment, greatly reducing the safety production accidents caused by high-speed impact.

[0056] Embodiment 2 of the drainage robot braking system of the present invention:

[0057] The difference between this embodiment and embodiment 1 is that in embodiment 1, the transmission groove wall section 128 includes a first groove wall unit 125 and a second groove wall unit 126, and the change rate of the first groove wall unit 125 close to the center line of the transmission wheel 113 is smaller than the change rate of the second groove wall unit 126 close to the center line of the transmission wheel 113. In this embodiment, the transmission groove wall section includes only one groove wall unit, and the groove wall unit gradually approaches the center line of the transmission wheel in the clockwise direction.

[0058] Embodiment 3 of the drainage robot braking system of the present invention:

[0059] The difference between this embodiment and the first embodiment is that in the first embodiment, two transmission groove wall segments 128 are provided, and the two transmission groove wall segments 128 are of a central symmetrical structure. In this embodiment, three transmission groove wall segments are provided.

[0060] Embodiment 4 of the drainage robot braking system of the present invention:

[0061] The difference between this embodiment and embodiment 1 is that in embodiment 1, the opening of the diameter-changing groove faces the drive motor 102, and the hook head 119 extends upward. In this embodiment, the opening of the diameter-changing groove faces away from the drive motor, and the hook head extends downward.

[0062] Embodiment 5 of the drainage robot braking system of the present invention:

[0063] The difference between this embodiment and embodiment 1 is that in embodiment 1, the upper cylinder 106 is provided with a first compression spring positioning groove 117, the brake block 112 is provided with a second compression spring positioning groove 121, and the two ends of the compression spring 109 are respectively installed in the two compression spring positioning grooves. In this embodiment, the upper cylinder is provided with a first compression spring positioning protrusion, the brake block is provided with a second compression spring positioning protrusion, and the two ends of the compression spring are respectively sleeved outside the two compression spring positioning protrusions.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. The drainage robot braking system is characterized by: The invention comprises a cylinder, wherein a driving device and a transmission wheel (113) are arranged in the cylinder, wherein the driving device comprises a driving motor (102) and a transmission shaft (107), wherein the driving motor (102) is in transmission connection with the transmission shaft (107) so as to drive the transmission shaft (107) to move in the circumferential direction of the cylinder; the transmission wheel (113) is fixed on the transmission shaft (107) so as to move in the circumferential direction of the cylinder along with the transmission shaft (107), wherein a diameter-changing groove is arranged at an end of the transmission wheel (113), wherein the diameter-changing groove has at least two transmission groove wall sections (128) in the circumferential direction of the transmission wheel (113), and the transmission groove wall sections (128) gradually approach or move away from the transmission wheel (113) in the circumferential direction of the transmission wheel (113). The cylinder body is provided with a brake block (112) on the outside, at least two brake blocks (112) are arranged along the circumference of the cylinder body, and a brake convex portion (120) is provided on the outer side surface of the brake block (112), and both side surfaces of the brake convex portion (120) in the axial direction of the cylinder body are inclined surfaces; the brake block (112) is provided with a transmission hook (111), and the transmission hook (111) has a hook head (119), and the hook head (119) is located in the diameter-changing groove and hooked on the corresponding transmission groove wall section (128); a reset elastic member is provided between the cylinder body and the corresponding brake block (112), and the reset elastic member is used to apply an elastic force to the brake block (112) to make it move away from the cylinder body.

2. The drainage robot braking system according to claim 1, characterized in that: The transmission groove wall section (128) comprises a first groove wall unit (125) and a second groove wall unit (126), wherein the rate of change of the first groove wall unit (125) approaching or moving away from the center line of the transmission wheel (113) is smaller than the rate of change of the second groove wall unit (126) approaching or moving away from the center line of the transmission wheel (113).

3. The drainage robot braking system according to claim 1 or 2, characterized in that: Two transmission groove wall sections (128) are provided, and the two transmission groove wall sections (128) are of a centrally symmetrical structure.

4. The drainage robot braking system according to claim 1 or 2, characterized in that: The opening of the diameter-changing groove faces the drive motor (102); the drive wheel (113) is sleeved on the drive shaft (107) from one end of the drive shaft (107) away from the drive motor (102); and the drive wheel (113) and the drive shaft (107) are assembled together to prevent rotation.

5. The drainage robot braking system according to claim 1 or 2, characterized in that: The transmission hook (111) is a U-shaped structure.

6. The drainage robot braking system according to claim 1 or 2, characterized in that: The resetting elastic member is a compression spring (109).

7. The drainage robot braking system according to claim 6, characterized in that: A compression spring positioning groove is provided on the cylinder and / or the corresponding brake block (112), and the end of the compression spring (109) is installed in the compression spring positioning groove.

8. The drainage robot braking system according to claim 1 or 2, characterized in that: The inclined surface is a straight inclined surface.

9. The drainage robot braking system according to claim 1 or 2, characterized in that: The hook head (119) is a cylindrical structure.

10. The drainage robot braking system according to claim 1 or 2, characterized in that: At least two resetting elastic members are provided between the cylinder and the corresponding brake block (112).

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