A rotary drilling rig drill rod limiting device with protection

Abstract

The application relates to the rotary drilling rig field and particularly discloses a rotary drilling rig drill rod limiting device with protection, which comprises a pulley frame, characterized in that: an installation frame is installed on the pulley frame; a height limiting switch is fixed in the installation frame; a counterweight is connected to the control rod of the height limiting switch so that the limiting switch is in an open state under the counterweight; a limiting piece is fixed on the installation frame; and the limiting piece is located directly below the control rod to limit the maximum stroke of the control rod. The limiting piece limits the maximum tensile displacement of the spring in the height limiting switch, and the internal structure of the sensor is protected.

Description

Technical Field

[0001] This application relates to the field of rotary drilling rigs, and in particular to a protective drill rod limiting device for rotary drilling rigs. Background Technology

[0002] A rotary drilling rig is a type of soil drilling equipment, mainly consisting of a chassis, winch, drill rod, and power head. The rotary table or power head on the rig drives the telescopic drill rod and the drill bit at the bottom of the rod to rotate. Cutting tools on the bottom and side openings of the drill bucket cut through the soil and rock, and the cut soil and rock enter the drill bucket through the openings. Once the drill bucket is full, the drill bit is raised to the borehole opening by extending the drill rod, automatically opening the bottom to unload the cuttings. The drill bucket is then lowered back to the bottom of the hole to continue drilling, repeating this process until the designed hole depth is reached.

[0003] When lifting drill rods using a winch, it's necessary to control the lifting height. Currently, most equipment uses spring-reset height limit switches. Since the drill rod or other heavy objects are attached to the bottom of the limit switch, it's normally in an open state. When the drill rod is lifted, it touches the bottom of the limit switch, causing it to close from the open state, thus limiting the height. However, in the normal open state, the internal spring is constantly under extreme tension, which can easily damage the internal structure, causing the height limit switch to malfunction and requiring replacement of the entire switch. Utility Model Content

[0004] To address the aforementioned issues, this application provides a protective rotary drilling rig drill rod limit device, which prevents the limit switch from being damaged and extends its service life.

[0005] The protective rotary drilling rig drill rod limiting device provided in this application adopts the following technical solution: A protective rotary drilling rig drill rod limiting device includes a pulley frame, characterized in that: an installation frame is installed on the pulley frame, a height limit switch is fixed inside the installation frame, a control rod of the height limit switch is connected to a counterweight so that the limit switch is normally open under the counterweight, and a limiting member is fixed on the installation frame, the limiting member being located directly below the control rod to limit the maximum stroke of the control rod.

[0006] Optionally, the control lever is connected to a counterweight via a first chain.

[0007] Optionally, the pulley frame is also provided with a second chain, the other end of which is connected to a counterweight.

[0008] Optionally, the counterweight includes a first counterweight ring and a second counterweight ring, which are detachably connected and form a perforation after being spliced ​​together.

[0009] Optionally, the first counterweight ring has a threaded hole, and the second counterweight ring has a through hole, through which a bolt passes and connects to the threaded hole.

[0010] Optionally, a mounting plate is fixed on the pulley frame, a pin is fixed on the mounting plate, the mounting frame has a pin hole, the pin passes through the pin hole, and an R-shaped pin is inserted into the end of the pin.

[0011] Optionally, the limiting member passes through a link of the first chain.

[0012] Optionally, the limiting component is integrally formed with the mounting frame.

[0013] In summary, this application includes at least one of the following beneficial technical effects: Under the action of the counterweight, the control rod is pulled down, causing the contacts in the height limit switch to open, thereby putting the height limit switch in a normally open state. When the counterweight is lifted by the drill rod, due to the spring reset action inside the height limit switch, the control rod moves upward, and when it reaches the designed stroke, the contacts in the height limit switch close, issuing a command to control the winch on the rotary drilling rig to stop working. The height limit switch is protected by the limit component, thereby improving the overall lifespan of the product.

[0014] The position of the counterweights of different weights can be changed to adjust the maximum lifting height of the drill pipe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 yes Figure 2 An enlarged schematic diagram of part A in the middle; Figure 3 This is a schematic diagram of the mounting frame and the height limit switch; Figure 4 This is a structural diagram of the first counterweight ring.

[0016] Reference numerals in the attached drawings: 1. Pulley frame; 2. Mounting frame; 3. Mounting plate; 4. Pin shaft; 5. Pin hole; 6. Height limit switch; 7. Control rod; 8. Limit rod; 9. First chain; 10. Second chain; 11. First counterweight ring; 12. Second counterweight ring; 13. Through hole; 14. Threaded hole; 15. Bolt. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0018] A protective drill rod limiting device for a rotary drilling rig includes a pulley frame 1, on which a mounting frame 2 is installed. The mounting frame 2 can be directly fixed to the pulley frame 1 in any way, such as by welding it to the pulley frame 1 or by directly fixing it to the pulley frame 1 with bolts 15. Alternatively, it can be indirectly fixed to the pulley frame 1 in other ways; this embodiment uses an indirect method. Specifically, a mounting plate 3 is fixed to the pulley frame 1, and a pin 4 is fixed to the mounting plate 3. The pin 4 is generally integrally formed with the mounting plate 3. The mounting frame 2 has a pin hole 5 through which the pin 4 passes, and an R-shaped pin (not shown in the figure) is inserted into the end of the pin 4. The mounting frame 2 is fixed by fitting the mounting frame 2 onto the pin 4 and using the R-shaped pin for limiting. The mounting plate 3 is fixed to the pulley frame 1 by bolts 15.

[0019] A height limit switch 6, specifically a spring-return type, is fixed inside the mounting frame 2. The housing of the height limit switch 6 is integrally formed with the mounting frame 2 or connected by screws. The control rod 7 of the height limit switch 6 is located at the bottom and controls the opening and closing of the internal contacts. A counterweight is connected to the control rod 7 so that the limit switch is normally open under the counterweight. Under the action of the counterweight, the control rod 7 is pulled down, causing the contacts inside the height limit switch 6 to open, thus returning the height limit switch 6 to the normally open state. When the counterweight is lifted by the drill pipe, the spring inside the height limit switch 6 returns the control rod 7 upwards. Upon reaching the designed stroke, the contacts inside the height limit switch 6 close, sending a command to stop the winch on the rotary drilling rig.

[0020] A limiting member is fixed on the mounting frame 2. The limiting member is located directly below the control rod 7 to limit the maximum stroke of the control rod 7. In this embodiment, the limiting member is a limiting rod 8 integrally formed with the mounting frame 2, and the limiting rod 8 is located directly below the control rod 7. The control rod 7 is connected to the counterweight via a first chain 9. Since the two sides are unbalanced in this case, a second chain 10 is provided on the other side of the pulley frame 1. The other end of the second chain 10 is connected to the counterweight. The upper end of the second chain 10 can be directly welded to the pulley frame 1, but in this solution, a mounting plate 3 is also fixed on the other side of the pulley frame 1. The uppermost link of the first connection is sleeved on the pin 4 of the mounting plate 3, and the pin 4 also has an R-type pin limiting. The uppermost link of the first chain 9 is passed through by the limiting rod 8. The counterweight includes a first counterweight ring 11 and a second counterweight ring 12, both of which are C-shaped rings. The first and second counterweight rings 11 and 12 are detachably connected and, after assembly, form a through hole. The through hole allows the steel cable connecting the drill rod to pass through. The first counterweight ring 11 has a threaded hole 14, and the second counterweight ring 12 has a through hole 13. A bolt 15 passes through the through hole 13 and connects to the threaded hole 14 to assemble the counterweight. The second counterweight ring 12 is connected to the first chain 9, and the first counterweight ring 11 is connected to the second chain 10.

[0021] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A protective rotary drilling rig drill rod limiting device, comprising a pulley frame, characterized in that: A mounting frame is installed on the pulley frame, and a height limit switch is fixed inside the mounting frame. The control rod of the height limit switch is connected to a counterweight so that the limit switch is normally open under the counterweight. A limit member is fixed on the mounting frame and is located directly below the control rod to limit the maximum stroke of the control rod.

2. The protective rotary drilling rig drill rod limiting device according to claim 1, characterized in that: The control lever is connected to the counterweight via a first chain.

3. A protective rotary drilling rig drill rod limiting device according to claim 2, characterized in that: The pulley frame is also equipped with a second chain, the other end of which is connected to a counterweight.

4. The protective rotary drilling rig drill rod limiting device according to claim 1, characterized in that: The counterweight includes a first counterweight ring and a second counterweight ring, which are detachably connected and form a perforation after being spliced ​​together.

5. A protective rotary drilling rig drill rod limiting device according to claim 4, characterized in that: The first counterweight ring has a threaded hole, and the second counterweight ring has a through hole. The bolt passes through the through hole and connects to the threaded hole.

6. A protective rotary drilling rig drill rod limiting device according to claim 1, characterized in that: A mounting plate is fixed on the pulley frame, and a pin is fixed on the mounting plate. The mounting frame has a pin hole, through which the pin passes, and an R-shaped pin is inserted at the end of the pin.

7. A protective rotary drilling rig drill rod limiting device according to claim 2, characterized in that: The limiting member passes through a link of the first chain.

8. A protective rotary drilling rig drill rod limiting device according to claim 1, characterized in that: The limiting component is integrally formed with the mounting frame.

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