Automatic load limiting protection device for hydraulic slip tong head lifting mechanism

Abstract

The utility model discloses an automatic load limiting protection device for a hydraulic slip tong head lifting mechanism, which relates to the technical field of petroleum drilling devices, and particularly structurally comprises a cylinder body, a piston rod, a piston rod and a piston rod, the piston end of the outer rod head connecting shaft is located in the cavity, and a front-back through channel is formed in the outer rod head connecting shaft; the adjusting screw plug is mounted at the piston end of the outer rod head connecting shaft so as to close one end of the channel; the inner rod head connecting shaft is installed in the channel, and a gap is reserved between the inner rod head connecting shaft and the adjusting screw plug; the combined disc spring is mounted between the inner rod head connecting shaft and the adjusting screw plug; the sealing piece is installed on the outer rod head connecting shaft, and the outer wall of the sealing piece makes contact with the inner wall of the cylinder body to form sealing. The hydraulic cylinder for the hydraulic slip tong head solves the technical problem that an existing hydraulic cylinder for the hydraulic slip tong head and a connecting component are prone to damage.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling devices, in particular to an automatic load-limiting protection device for a hydraulic slip tong head lifting mechanism. Background Art

[0002] A hydraulic slip is a mechanized device for clamping a drill string during tripping operations in oil drilling. The movement of its tong head lifting mechanism is driven by two hydraulic cylinders. The two ends of the hydraulic cylinders are respectively connected to a fixed bracket and a tong head earring through pin shafts. When the hydraulic cylinder extends, the tong head descends and then clamps the pipe string; when the hydraulic cylinder retracts, the tong head rises to release the pipe string.

[0003] During the drilling operation, after the tong head descends in place and clamps the pipe string, the directional control valve that controls the telescopic movement of the hydraulic cylinder immediately switches to the middle position. Since the middle position function of the directional control valve is a non-pressure-relief mode, the two oil cavities of the hydraulic cylinder are in a sealed pressure-holding state; then the elevating elevator is lifted to release the pipe string, and the tong head of the hydraulic slip bears the weight of the entire pipe string. Due to the large weight of the pipe string, the tong head generates a secondary downward displacement driven by the pipe string. This displacement causes the piston rod of the hydraulic cylinder to extend, and the pressure in the rodless cavity instantaneously increases and outputs a large reaction force, resulting in a large support reaction force being borne between the fixed bracket and the tong head earring, causing components such as the fixed bracket, tong head earring, and pin shaft to be frequently damaged and replaced, affecting the normal use of the equipment. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an automatic load-limiting protection device for a hydraulic slip tong head lifting mechanism, which solves the technical problem that the hydraulic cylinder and connecting components of the existing hydraulic slip tong head are easily damaged.

[0005] The embodiment of the present application discloses an automatic load-limiting protection device for a hydraulic slip tong head lifting mechanism, including:

[0006] A cylinder body, in which a cavity with one end open is provided;

[0007] An outer rod head connecting shaft, the piston end of which is located inside the cavity, and a through channel is provided inside the outer rod head connecting shaft;

[0008] An adjusting plug, installed at the piston end of the outer rod head connecting shaft to close one end of the channel;

[0009] An inner rod head connecting shaft, installed inside the channel, and a gap is left between the inner rod head connecting shaft and the adjusting plug;

[0010] A combined disc spring, installed between the inner rod head connecting shaft and the adjusting plug;

[0011] A seal is installed on the outer rod head connecting shaft, and the outer wall of the seal contacts the inner wall of the cylinder block to form a seal.

[0012] This application is provided with an inner rod head connecting shaft, an adjusting plug and a combined disc spring to form a structure similar to a buffer, so that it can play a role in protecting this application during subsequent work.

[0013] On the basis of the above technical solutions, the embodiments of this application can also be improved as follows:

[0014] Further, a pre-tightening force is applied to the combined disc spring. The beneficial effect of this step is to improve the buffer through the pre-tightening force to protect this application.

[0015] Further, the adjusting plug is threadedly connected to the inner wall of the channel. The beneficial effect of this step is that it is convenient to provide a pre-tightening force through the adjusting plug.

[0016] Further, a first stepped stage is provided on the inner wall of the channel, and a second stepped stage is provided on the outer wall of the inner rod head connecting shaft to cooperate with the first stepped stage. The beneficial effect of this step is that the synchronous movement or relative movement of the outer rod head connecting shaft and the inner rod head connecting shaft can be realized through the two stepped stages.

[0017] Further, it also includes:

[0018] A first sealing ring, which is sleeved on the piston end of the outer rod head connecting shaft, and the outer wall of the first sealing ring cooperates with the inner wall of the cavity to form a seal;

[0019] A second sealing ring, which is installed on the inner wall of the seal, and the second sealing ring contacts the outer wall of the outer rod head connecting shaft to form a seal;

[0020] A third sealing ring, which is installed on the outer wall of the seal, and the third sealing ring contacts the inner wall of the cavity to form a seal. The beneficial effect of this step is to improve the sealing performance through the mutual cooperation of the first sealing ring, the second sealing ring and the third sealing ring.

[0021] Further, the piston end of the outer rod head connecting shaft divides the cavity into a rod chamber and a rodless chamber;

[0022] A first oil port communicating with the rod chamber and a second oil port communicating with the rodless chamber are spaced apart on the side wall of the cylinder block. The beneficial effect of this step is to realize the function of the hydraulic cylinder through multiple oil ports.

[0023] Further, a signal interface is provided on the side wall of the cylinder block, and the signal interface is located between the first oil port and the second oil port. The beneficial effect of this step is that signal feedback can be realized through the signal interface.

[0024] Further, a fixed bracket is hinged to the end of the cylinder block. The beneficial effect of this step is to connect the overall structure.

[0025] Further, a rod head is installed at one end of the inner rod head connecting shaft away from the adjusting plug. The beneficial effect of this step is that the rod head is convenient for connecting other components.

[0026] Further, a tong head earring is installed on the rod head.

[0027] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0028] 1. In the present application, the inner rod head connecting shaft is matched with the stepped inner hole of the outer rod head connecting shaft through a stepped outer circle, and the two are combined to form the function of a telescopic piston rod.

[0029] 2. In the present application, the adjusting plug is installed at the end of the inner hole of the rod body through a thread, and the forward and reverse rotation of the adjusting plug is used to adjust the pre-tightening force of the combined disc spring.

[0030] 3. In the present application, a buffer structure is formed by arranging an adjusting plug, an inner rod head connecting shaft and a combined disc spring, which can avoid the compression damage of the counter-thrust generated after the piston rod of the tong head lifting hydraulic cylinder extends out for the second time to the body parts, and ensure the safe and reliable operation of the equipment; at the same time, if the operator makes a misoperation and lifts the pipe string before the tong head releases the pipe string, the pipe string drives the tong head to rise and the piston rod bears pressure. When this pressure is greater than the pre-tightening force of the disc spring in the piston rod, the total length of the piston rod contracts to give timely buffering, avoiding damage to the parts of the tong head lifting mechanism. Description of the Drawings

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic structural diagram of an automatic load-limiting protection device for a hydraulic chuck tong head lifting mechanism according to a specific embodiment of the present invention;

[0033] 1 - Cylinder block; 2 - Outer rod head connecting shaft; 3 - Adjusting plug; 4 - Inner rod head connecting shaft; 5 - Combined disc spring; 6 - Seal; 7 - First sealing ring; 8 - Second sealing ring; 9 - Third sealing ring; 10 - Rod chamber; 11 - Rodless chamber; 12 - First oil port; 13 - Second oil port; 14 - Signal interface; 15 - Fixed bracket; 16 - Rod head; 17 - Clamp head earring;

[0034] 101 - Opening; 102 - Cavity;

[0035] 201 - Channel; 202 - First stage; 203 - Second stage. Detailed implementation manner

[0036] The embodiments of the technical solution of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, so they are only examples and cannot be used to limit the protection scope of the present utility model.

[0037] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present utility model belongs.

[0038] In this application, unless otherwise clearly defined and limited, terms such as "installation", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific implementation manners.

[0040] Embodiment:

[0041] As Figure 1 shown, this application discloses an automatic load-limiting protection device for a hydraulic chuck head lifting mechanism, which is used to design an existing hydraulic cylinder. Specifically, a combined disc spring is arranged inside the piston rod to form a buffer structure, which plays a buffering role in case of special situations and avoids easy damage to the hydraulic cylinder and connecting components.

[0042] The specific structure of this application includes:

[0043] Cylinder block 1, inside which there is a cavity 102 with an opening 101 at one end. This cylinder block 1 is an existing cylinder block and will not be elaborated here;

[0044] Outer rod head connecting shaft 2, the piston end of the outer rod head connecting shaft 2 is located inside the cavity 102, this piston end is the right end of the outer rod head connecting shaft 2, and a through channel 201 is provided inside the outer rod head connecting shaft 2 from front to back; As Figure 1 shown, the right end of the outer rod head connecting shaft 2 is the piston end, and the left end is for the free end. The piston end divides the cavity 102 into two cavities, so that the left - right lateral movement of the outer rod head connecting shaft 2 can be completed. Compared with the existing rod heads, in this application, the inside of the outer rod head connecting shaft 2 is opened to form a through channel from left to right, which is convenient for assembling subsequent related components;

[0045] Adjusting plug 3, installed at the piston end of the outer rod head connecting shaft 2 to close one end of the channel 201;

[0046] Inner rod head connecting shaft 4, installed inside the channel 201, and there is a gap between the inner rod head connecting shaft 4 and the adjusting plug 3;

[0047] Combined disc spring 5, installed between the inner rod head connecting shaft 4 and the adjusting plug 3; In this application, the adjusting plug 3, the inner rod head connecting shaft 4 and the combined disc spring 5 are combined to form a buffer structure. When the jaw of the hydraulic slip bears the weight of the entire pipe string, the pipe string drives the outer rod head connecting shaft to produce a secondary extension action, the pressure in the cylinder body rises instantaneously and outputs a large reaction force, and the components between the fixed bracket and the jaw earring bear the reaction force. When the reaction force is greater than the pre - tightening force of the combined disc spring, the combined disc spring is compressed and deformed, and the distance between the inner rod head connecting shaft 4 and the adjusting plug 3 is shortened, making the connection between the fixed bracket 15 and the jaw earring 17 become a flexible connection, restricting the further increase of the reaction force and protecting components such as the fixed bracket, the jaw earring, and the pin shaft from damage;

[0048] Seal 6, installed on the outer rod head connecting shaft 2, and the outer wall of the seal 6 contacts the inner wall of the cylinder block 1 to form a seal. This seal 6 is used to form a seal so that the basic function of the hydraulic cylinder can be formed for the whole device.

[0049] In order to enable this application to achieve the buffering function, a pre - tightening force is applied to the combined disc spring 5 in this application, and the magnitude of this pre - tightening force can be set according to the user's choice.

[0050] In order to ensure the stability of the stroke of the combined spring 5, the adjusting plug 3 in this application is thread - connected with the inner wall of the channel 201 to ensure stability.

[0051] Specifically, a first stepped stage 202 is provided on the inner wall of the channel 201, and a second stepped stage 203 that cooperates with the first stepped stage 202 is provided on the outer wall of the inner rod head connecting shaft 4; the first and second in the first stepped stage 202 and the second stepped stage 203 are only used for distinction. Specifically, the first stepped stage 202 is a convex table surface protruding inward, and the second stepped stage 203 is a concave surface recessed inward. The functions of the first stepped stage 202 and the second stepped stage 203 are as follows: when the inner rod head connecting shaft 4 and the outer rod head connecting shaft 2 move outward, they move synchronously; when moving inward, relative movement can occur.

[0052] The specific structure of the present application includes:

[0053] A first sealing ring 7, the first sealing ring 7 is sleeved on the piston end of the outer rod head connecting shaft 2, and the outer wall of the first sealing ring 7 cooperates with the inner wall of the cavity 102 to form a seal;

[0054] A second sealing ring 8 is installed on the inner wall of the seal 6, and the second sealing ring 8 contacts the outer wall of the outer rod head connecting shaft 2 to form a seal;

[0055] A third sealing ring 9 is installed on the outer wall of the seal 6, and the third sealing ring 9 contacts the inner wall of the cavity 102 to form a seal. Similarly, the first, second, and third in the present application are only used for distinction and have no special meaning; as Figure 1 shown, the first sealing ring 7 is located on the right side, the second sealing ring 8 is located between the first sealing ring 7 and the third sealing ring 9, and the third sealing ring is located on the left side, so as to ensure sealing; in order to further ensure sealing, the present application can also be provided with components such as a guide ring and a dust ring at corresponding positions.

[0056] Specifically, the piston end of the outer rod head connecting shaft 2 divides the cavity 102 into a rod chamber 10 and a rodless chamber 11;

[0057] A first oil port 12 communicating with the rod chamber 10 and a second oil port 13 communicating with the rodless chamber 11 are spaced apart and provided on the side wall of the cylinder block 1; similarly, the first and second here are only used for distinction. The rod chamber 10 is located on the left side, the rodless chamber 11 is located on the right side, the first oil port 12 is located on the left side, and the second oil port 13 is located on the right side.

[0058] Specifically, a signal interface 14 is provided on the side wall of the cylinder block 1, that is, when the entire rod is fully retracted, a feedback variable signal is output.

[0059] Specifically, a fixed bracket 15 is hinged to the end of the cylinder block 1; a rod head 16 is installed at one end of the inner rod head connecting shaft 4 away from the adjusting plug 3; a clamp head earring 17 is installed on the rod head 16. When this application is in use, it is connected to components such as the fixed bracket 15, the rod head 16, and the clamp head earring 17 to achieve corresponding functions.

[0060] The working principle of this application is as follows:

[0061] When this application is in use, first assemble it according to the above structure, and at the same time apply a pre-tightening force to the combined disc spring 5, and this pre-tightening force is set as F1; the thrust output by this application as a hydraulic cylinder under the rated working pressure is F2, and the set disc spring pre-tightening force F1 is equal to the output thrust F2 of the hydraulic cylinder; when this application works within the rated working pressure, the combined state remains unchanged, and the total length of the piston rod (outer rod head connecting shaft and inner rod head connecting shaft) remains unchanged; when the clamp head of the hydraulic slip bears the weight of all the pipe strings, the pipe strings drive the piston rod to produce a secondary extension action, the pressure in the hydraulic cylinder instantaneously increases and outputs a large reaction thrust F3, and the components between the fixed bracket and the clamp head earring bear the action of the reaction thrust F3; when the reaction thrust F3 is greater than the disc spring pre-tightening force F1, the combined disc spring is compressed and deformed, the total length of the piston rod is shortened, and a flexible connection is formed between the fixed bracket and the clamp head earring, restricting the further increase of the reaction thrust and protecting components such as the fixed bracket, the clamp head earring, and the pin shaft from damage.

[0062] In the description of this utility model, a large number of specific details are illustrated. However, it can be understood that the embodiments of this utility model can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0063] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of this utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. An automatic load limiting protection device for a hydraulic slip clamp head lifting mechanism, characterized in that: include: A cylinder body (1), wherein a cavity (102) having an opening (101) is provided in the cylinder body (1); An outer rod head connecting shaft (2), wherein the piston end of the outer rod head connecting shaft (2) is located inside the cavity (102), and a passage (201) that passes through from front to back is provided inside the outer rod head connecting shaft (2); An adjusting screw plug (3) is mounted on the piston end of the outer rod head connecting shaft (2) to complete the sealing of one end of the channel (201); An inner rod head connecting shaft (4) is installed inside the channel (201), and a gap is left between the inner rod head connecting shaft (4) and the adjusting screw plug (3); A combined disc spring (5) is installed between the inner rod head connecting shaft (4) and the adjusting screw plug (3); A sealing member (6) is mounted on the outer rod head connecting shaft (2), and an outer wall of the sealing member (6) contacts an inner wall of the cylinder body (1) to form a seal.

2. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 1 is characterized in that: The combined disc spring (5) exerts a pre-tightening force.

3. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 2 is characterized in that: The adjusting screw plug (3) is threadedly connected to the inner wall of the channel (201).

4. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 1 is characterized in that: The inner wall of the channel (201) is provided with a first stage (202), and the outer wall of the inner rod head connecting shaft (4) is provided with a second stage (203) that matches the first stage (202).

5. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 1 is characterized in that: It also includes: A first sealing ring (7), the first sealing ring (7) being sleeved on the piston end of the outer rod head connecting shaft (2), and the outer wall of the first sealing ring (7) cooperates with the inner wall of the cavity (102) to form a seal; A second sealing ring (8) is mounted on the inner wall of the sealing member (6), and the second sealing ring (8) contacts the outer wall of the outer rod head connecting shaft (2) to form a seal; A third sealing ring (9) is mounted on the outer wall of the sealing member (6), and the third sealing ring (9) contacts the inner wall of the cavity (102) to form a seal.

6. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 1 is characterized in that: The piston end of the outer rod head connecting shaft (2) divides the cavity (102) into a rod cavity (10) and a rodless cavity (11); A first oil port (12) communicating with the rod chamber (10) and a second oil port (13) communicating with the rodless chamber (11) are provided at intervals on the side wall of the cylinder body (1).

7. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 6 is characterized in that: A signal interface (14) is provided on the side wall of the cylinder body (1), and the signal interface (14) is located between the first oil port (12) and the second oil port (13).

8. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 1 is characterized in that: A fixing bracket (15) is hingedly connected to the end of the cylinder body (1).

9. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 1, characterized in that: A rod head (16) is installed at one end of the inner rod head connecting shaft (4) away from the adjusting screw plug (3).

10. The automatic load limiting protection device for the hydraulic slip clamp head lifting mechanism according to claim 9, characterized in that: A clamp head earring (17) is mounted on the rod head (16).

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