Rotary drilling rig pressurized by multiple oil cylinders

Abstract

The invention relates to the field of rotary drilling rigs, and particularly discloses a multi-oil-cylinder pressurizing rotary drilling rig which comprises a vehicle body platform, a mast, an adjusting mechanism for adjusting the angle of the mast, a power head, a power head pressurizing oil cylinder and a drill rod assembly, and is characterized by further comprising a mast telescopic pressurizing oil cylinder and a connecting seat, the mast is connected with the connecting base in a sliding mode so that the mast can slide relative to the connecting base when the mast telescopic pressurizing oil cylinder acts. By optimizing the layout of the oil cylinders, the drilling machine can remarkably improve the drilling efficiency, enhance the working stability, adapt to various complex geological conditions and effectively solve the problems existing in the prior art.

Description

Technical Field

[0001] This application relates to the field of rotary drilling rigs, and in particular to a rotary drilling rig with multi-cylinder pressurization. Background Art

[0002] As a key equipment for pile foundation construction, rotary drilling rigs are widely used in infrastructure construction fields such as buildings, bridges, and subways. Traditional rotary drilling rigs mostly adopt single-cylinder pressurization or simple double-cylinder pressurization systems, which expose many deficiencies when facing complex geological conditions and large-diameter pile hole construction. The single-cylinder pressurization system has limited pressure and slow drilling speed, making it difficult to meet the construction requirements of large-diameter and deep pile holes. Moreover, when the single cylinder is working, the drill pipe is unevenly stressed, which easily causes the drill pipe to deflect and affects the hole-forming quality. Summary of the Invention

[0003] In order to improve the above problems, this application provides a rotary drilling rig with multi-cylinder pressurization. By optimizing the layout of the cylinders, this drilling rig can significantly improve the drilling efficiency, enhance the working stability, and adapt to various complex geological conditions, effectively solving the problems existing in the prior art.

[0004] A rotary drilling rig with multi-cylinder pressurization provided by this application adopts the following technical solutions:

[0005] A rotary drilling rig with multi-cylinder pressurization includes a vehicle body platform, a mast, an adjusting mechanism for adjusting the mast angle, a power head, a power head pressurization cylinder, and a drill pipe assembly. It is characterized in that: it further includes a mast telescopic pressurization cylinder and a connecting seat. One end of the mast telescopic pressurization cylinder is connected to the mast, and the other end is connected to the connecting seat. The mast is slidably connected to the connecting seat so that the mast slides relative to the connecting seat when the mast telescopic pressurization cylinder acts.

[0006] Optionally, one mast telescopic pressurization cylinder is arranged on each side of the power head, and the two mast telescopic pressurization cylinders are symmetrically distributed on both sides of the power head pressurization cylinder.

[0007] Optionally, the vehicle body platform includes a drilling rig chassis, a crawler support connected to the drilling rig chassis, and crawlers installed on the crawler support; a rescue winch is installed on the drilling rig chassis. The rescue winch is located in front of or behind the drilling rig chassis, and the rescue winch is fixed on the drilling rig chassis or is fixed to the drilling rig chassis in a detachable manner.

[0008] Optionally, the rescue winch includes a frame body, a hydraulic motor fixed on the frame body, a drum rotatably connected to the frame body, and a steel wire rope with one end fixed to the drum. The output shaft of the hydraulic motor rotates synchronously with the drum; a rotating rod is rotatably connected to the frame body. One end of the rotating rod is connected with a return spring, and the end of the return spring away from the rotating rod is fixed on the frame body. The rotating rod is provided with an abutting member for abutting against the steel wire rope.

[0009] Optionally, the crawler bracket is slidably connected to the drill rig chassis. A double-rod hydraulic cylinder is fixed inside the drill rig chassis, and the two pistons of the double-rod hydraulic cylinder are respectively connected to the crawler brackets on both sides.

[0010] Optionally, it further includes a jib. One end of the jib is rotatably connected to the mast, and the other end has a connecting part for connecting a steel wire rope. A spring is connected near the middle of the jib, and the end of the spring away from the jib is connected to the mast. The jib is in a horizontally extended state under the action of the spring. A fixing device is provided on the mast. When the jib overcomes the action of the spring and fits or approaches the mast, the fixing device locks the jib.

[0011] Optionally, a pulley frame is installed at the top of the mast, and an installation frame is installed on the pulley frame. A height limit switch is fixed inside the installation 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 limiting member is fixed on the installation frame, and the limiting member is located directly below the control rod to limit the maximum stroke of the control rod.

[0012] Optionally, the control rod is connected to the counterweight through a first chain. A second chain is also provided on the pulley frame, and the other end of the second chain is connected to the counterweight. The limiting member passes through the link of the first chain.

[0013] Optionally, it further includes: a mounting bracket rotatably connected to the pulley frame;

[0014] A drum rotatably mounted on the mounting bracket;

[0015] A tension spring with one end fixed to the mounting bracket and the other end fixed to the pulley frame, providing a pre-tightening force to ensure that the drum wheel always adheres to the steel wire rope;

[0016] A travel switch installed below the mounting bracket. When the drill pipe touches the bottom and causes the steel wire rope to loosen, the mounting bracket moves downward under the tension of the tension spring, triggering the travel switch to cut off the power of the winch.

[0017] Optionally, a rotating shaft is provided on the pull plate, and a bearing is installed on the rotating shaft. The drum is sleeved outside the bearing; a limiting portion is provided on the inner circle of the drum, and the limiting portion abuts against the outer circle of one end face of the bearing. A spacer sleeve is sleeved on the rotating shaft, one side of the spacer sleeve abuts against the inner circle of the other end face of the bearing, and the other side of the spacer sleeve abuts against the pull plate. A gap is provided between the drum and the pull plate. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0019] Figure 2 is the partial structural schematic of the embodiment of the present application Figure 1 ;

[0020] Figure 3 is a schematic diagram of the partial structure of an embodiment of the present application Figure 2 ;

[0021] Figure 4 is a schematic diagram of the overall structure of the drilling rig chassis;

[0022] Figure 5 is Figure 4 an enlarged schematic diagram of part A in

[0023] Figure 6 is Figure 4 a schematic diagram of the rescue hoist in , and an abutting sleeve is omitted;

[0024] Figure 7 is Figure 4 a top view of ;

[0025] Figure 8 is a schematic diagram of the overall structure of the steel rope fixing mechanism of the auxiliary hoist;

[0026] Figure 9 is Figure 8 an enlarged schematic diagram of part B in ;

[0027] Figure 10 is a schematic diagram when the auxiliary hoist is working;

[0028] Figure 11 is a schematic diagram of the overall structure of the drill pipe limiting device;

[0029] Figure 12 is Figure 11 an enlarged schematic diagram of part C in ;

[0030] Figure 13 is a schematic diagram of the installation frame and the height limit switch;

[0031] Figure 14 is a structural diagram of the first counterweight ring;

[0032] Figure 15 is a schematic diagram of the overall structure of the drill pipe bottom-touching protection device installed on the pulley frame;

[0033] Figure 16 is a top view of the installation bracket;

[0034] Figure 17 is along Figure 16 a sectional structural schematic diagram taken along the D-D line in ;

[0035] Figure 18 is Figure 16 a side view in .

[0036] Reference numerals: 01, vehicle body platform; 02, power head; 03, power head pressure cylinder; 04, adjustment mechanism; 05, drill pipe assembly; 06, mast telescopic pressure cylinder; 07, connecting seat;

[0037] A1, drill rig chassis; A2, crawler support; A3, crawler; A4, double-rod hydraulic cylinder; A5, rescue winch; A6, frame; A7, hydraulic motor; A8, drum; A9, spiral groove; A10, locking bolt; A11, rotating rod; A12, reset tension spring; A13, lever arm; A14, connecting plate; A15, connecting shaft; A16, abutting sleeve;

[0038] B1, mast; B2, boom; B3, connecting seat; B4, spring; B5, fixed seat; B6, pin hole; B7, mounting seat; B8, lock hole; B9, pin shaft;

[0039] C1, pulley frame; C2, mounting frame; C3, mounting plate; C4, pin shaft; C5, pin hole; C6, height limit switch; C7, control rod; C8, limit rod; C9, first chain; C10, second chain; C11, first counterweight ring; C12, second counterweight ring; C13, through hole; C14, threaded hole; C15, bolt;

[0040] D1, mounting bracket; D2, drum; D3, travel switch; D4, tension spring; D5, wire rope; D6, fixed shaft; D7, pulley frame; D8, pull plate; D9, screw; D10, self-locking nut; D11, washer; D12, bearing; D13, middle section; D14, side section; D15, limiting part; D16, spacer sleeve; D17, bent plate. Detailed implementation manners

[0041] The following will further elaborate on this application in conjunction with the attached Figures 1 - 18 drawings.

[0042] As Figures 1 - 3, an embodiment of the present application discloses a rotary drilling rig with multi-cylinder pressurization, which includes a vehicle body platform 01, a mast B1, an adjusting mechanism 04 for adjusting the mast angle, a power head 02, a power head pressurizing cylinder 03, a drill pipe assembly 05, a mast telescopic pressurizing cylinder 06, and a connecting seat 07. One end of the power head pressurizing cylinder 03 is rotatably connected to the mast B1, and the other end is rotatably connected to the power head 02. The power head 02 is slidably connected to the mast B1. One end of the mast telescopic pressurizing cylinder is connected to the mast B1 (rotatably connected through a shaft), and the other end is connected to the connecting seat (rotatably connected through a shaft). The mast B1 is slidably connected to the connecting seat 07 so that the mast B1 slides relative to the connecting seat 07 when the mast telescopic pressurizing cylinder 06 acts. One mast telescopic pressurizing cylinder 06 is arranged on each side of the power head 02, and the two mast telescopic pressurizing cylinders 06 are symmetrically distributed on both sides of the power head pressurizing cylinder 03. The above-mentioned adjusting mechanism can refer to the luffing mechanism of CN114562204A. Since it is prior art, it will not be elaborated too much. The drill pipe assembly 05 passes through the power head and is connected to the power head 02.

[0043] As Figures 4 - 7 , the vehicle body platform includes a drilling rig chassis A1, a crawler support A2 connected to the drilling rig chassis A1, and a crawler A3 installed on the crawler support A2. Among them, the crawler support A2 and the drilling rig chassis A1 can be connected in a fixed form (such as welding, bolt connection, etc.), or can be connected in a sliding manner, and its horizontal sliding direction is perpendicular to the advancing direction of the rotary drilling rig. Specifically, a part of the crawler support A2 is inserted into a chute in the drilling rig chassis A1, and a double-rod hydraulic cylinder A4 is installed in the chute. The cylinder body of the double-rod hydraulic cylinder A4 is fixed to the drilling rig chassis A1, and the two pistons of the double-rod hydraulic cylinder A4 are respectively connected to the crawler supports A2 on both sides.

[0044] A rescue winch A5 is installed on the drilling rig chassis A1. The rescue winch A5 is located in front of or behind the drilling rig chassis A1, and the rescue winch A5 is fixed to the drilling rig chassis A1 or is fixed to the drilling rig chassis A1 in a detachable manner. That is, the rescue winch A5 can be welded to the drilling rig chassis A1. Of course, in this embodiment, it is installed on the drilling rig chassis A1 by means of bolt fixation.

[0045] The rescue winch A5 includes a frame A6, a hydraulic motor A7 fixed on the frame A6, a drum A8 rotatably connected to the frame A6, and a steel rope with one end fixed on the drum A8. The other end of the steel rope is a free end and is used when rescue is needed. The hydraulic motor A7 is fixed to the frame A6 by bolts. The output shaft of the hydraulic motor A7 rotates synchronously with the drum A8. Here, the output shaft of the hydraulic motor A7 can be directly connected to the drum A8 for fixing. In this embodiment, a transfer head (not shown) is fixed on the output shaft of the hydraulic motor A7. The transfer head can be fixed to the output shaft of the hydraulic motor A7 through a coupling. After the transfer head is inserted into the drum A8, it is loosely matched with the drum A8. The locking bolt A10 radially passes through the drum A8 and is connected to the threaded hole on the transfer head to achieve synchronous rotation of the transfer head and the drum A8. There is a spiral groove A9 on the outer wall of the drum A8, and the steel rope is arranged along the path of the spiral groove A9 to form a single-row rope. The single-row rope means that the steel ropes do not overlap. The hydraulic motor A7 can also be replaced with a self-locking motor, and both the hydraulic motor and the self-locking motor can be equipped with a reducer as needed. The reducer can be built-in or external. The reducer can be a planetary reducer or an ordinary gear reducer.

[0046] A rotating rod A11 is rotatably connected to the frame A6, and a reset spring A12 is connected to one end of the rotating rod A11. The end of the reset spring A12 away from the rotating rod A11 is fixed to the frame A6. In order to facilitate pulling the rotating rod A11 in this scheme, a force arm A13 is fixed to one end of the rotating rod A11, and a steel rope is fixed on the force arm A13, so as to facilitate driving the rotating rod A11 to rotate. The rotating rod A11 has an abutment member that abuts against the steel rope to limit the steel rope from escaping from the spiral groove A9. A connecting plate A14 is fixed to the rotating rod 11, and a connecting shaft A15 is provided on the connecting plate A14, and the abutment member is installed on the connecting shaft A15. Two connecting plates A14 are provided and are spaced apart along the axial direction of the connecting shaft A15. The abutment member includes three abutment sleeves A16, and the abutment sleeves A16 are sleeved on the connecting shaft A15 and can rotate relative to the connecting shaft A15. One of the abutting sleeves A16 is located between the two connecting plates A14, and the other one is located on both sides of the two connecting plates A14.

[0047] Special note: the rescue winch A5 here is not the winch that comes with the rotary drilling rig itself, but is installed additionally. The drilling rig itself is generally equipped with a main winch and an auxiliary winch. Generally, the main winch is mainly connected to the drill rod, and the auxiliary winch is used to hoist other accessories. The main winch and the auxiliary winch are not used together. When the main winch is in use, the auxiliary winch steel rope fixing mechanism is required to fix the steel rope of the auxiliary winch.

[0048] like Figures 8 - 10, the steel rope fixing mechanism of the auxiliary hoist is as follows: One end of the boom B2 is rotatably connected to the mast B1, and the other end of the boom B2 has a connecting part for connecting the steel rope. A connecting seat B3 is fixed on the mast B1, and the boom B2 is rotatably connected to the connecting seat B3. Here, the connecting seat B3 can be regarded as a part of the mast B1. The connecting part is preferably a hole structure, and the hook at the end of the steel rope of the auxiliary hoist is hung in the hole structure.

[0049] Near the middle of the boom B2, a spring B4 is connected. Specifically, the connection point of the spring B4 and the boom B2 is located on the side of the midpoint of the boom B2 close to the mast 1, and the end of the spring B4 away from the boom B2 is connected to the mast 1. The boom B2 is in a horizontally extended state under the action of the spring B4. A fixing device is provided on the mast B1. When the boom B2 overcomes the action of the spring B4 and fits or approaches the mast B1, the fixing device locks the boom B2. An installation seat B7 is fixed on the mast B1, and a first hook hole is provided on the installation seat B7. A second hook hole is integrally formed on the boom B2. Hooks are formed at both ends of the spring B4 and are respectively hung in the first hook hole and the second hook hole.

[0050] The fixing device includes a fixing seat B5, the fixing seat B5 is fixed on the mast B1, a pin hole B6 is provided on the fixing seat B5, a pin shaft B9 is inserted into the pin hole B6, and a lock hole B8 corresponding to the pin hole B6 is provided on the mast B1. In order to simplify the structure, the lock hole B8 and the above-mentioned connecting part are common holes. The pin shaft B9 is connected to the fixing seat B5 or the mast B1 through a connecting rope. The setting of the connecting rope can prevent the pin shaft B9 from being lost.

[0051] As Figures 11 - 14 , a pulley frame C1 is installed at the top of the mast, and an installation frame C2 is installed on the pulley frame C1. The installation frame C2 can be directly fixed on the pulley frame C1 in any way, such as welded to the pulley frame C1, or directly fixed on the pulley frame C1 through bolts C15. Of course, it can also be indirectly fixed on the pulley frame C1 in other ways. In this embodiment, an indirect fixing method is adopted. Specifically, an installation plate C3 is fixed on the pulley frame C1, and a pin shaft C4 is fixed on the installation plate C3. The pin shaft C4 is generally integrally formed with the installation plate C3. The installation frame C2 has a pin hole C5, the pin shaft C4 passes through the pin hole C5, and an R-shaped pin (not shown in the figure) is inserted into the end of the pin shaft C4. By sleeving the installation frame C2 on the pin shaft C4 and limiting it with an R-shaped pin, the fixing of the installation frame C2 is realized. The installation plate C3 is fixed on the pulley frame C1 by means of bolt connection C15.

[0052] A height limit switch C6 is fixed inside the mounting frame C2, specifically a spring return type height limit switch C6. Here, the housing of the height limit switch C6 is integrally formed with the mounting frame C2 or connected by screws. The control rod C7 of the height limit switch C6 is located at the bottom, and the control rod C7 is used to control the closing or opening of the internal contacts of the height limit switch C6. A counterweight is connected to the control rod C7 of the height limit switch C6 so that the limit switch is in a normally open state under the counterweight. Under the action of the counterweight, the control rod C7 is pulled down, causing the contacts inside the height limit switch C6 to disconnect, and then the height limit switch C6 is in a normally open state. When the counterweight is lifted by the drill pipe, due to the spring return action inside the height limit switch C6, the control rod C7 moves upward, and when it reaches the designed stroke, the contacts inside the height limit switch C6 close, sending an instruction to control the winch on the rotary drilling rig to stop working.

[0053] A limiting member is fixed on the mounting frame C2. The limiting member is located directly below the control rod C7 to limit the maximum stroke of the control rod C7. In this embodiment, the limiting member is a limiting rod C8 integrally formed with the mounting frame C2, and the limiting rod C8 is located directly below the control rod C7. The control rod C7 is connected to the counterweight through a first chain C9. Since the two sides are unbalanced in this case, a second chain C10 is provided on the other side of the pulley frame C1. The other end of the second chain C10 is connected to the counterweight; the upper end of the second chain 10 can be directly welded to the pulley frame C1, but in this solution, a mounting plate C3 is also fixed on the other side of the pulley frame C1. The uppermost link of the first connection is sleeved on the pin shaft C4 of the mounting plate C3, and the pin shaft C4 also has an R-type pin for limiting. The uppermost link of the first chain C9 is passed through by the limiting rod C8. The counterweight includes a first counterweight ring C11 and a second counterweight ring C12. Both the first counterweight ring C11 and the second counterweight ring C12 are C-shaped rings. The first counterweight ring C11 and the second counterweight ring C12 are detachably connected and form a through hole after splicing. The function of the through hole is to allow the steel cable connecting the drill pipe to pass through. A threaded hole C14 is provided on the first counterweight ring C11, and a through hole C13 is provided on the second counterweight ring C12. A bolt C15 passes through the through hole C13 and is connected to the threaded hole C14 to realize the assembly of the counterweight. The second counterweight ring C12 is connected to the first chain C9, and the first counterweight ring C11 is connected to the second chain C10.

[0054] As Figures 15 - 18 The rotary drilling rig further includes a drill pipe bottom contact protection device. The drill pipe bottom contact protection device includes a mounting bracket D1, a drum D2, a tension spring D4, and a travel switch D3.

[0055] Among them, the mounting bracket D1 is rotatably connected to the pulley bracket D7. The pulley bracket D7 is generally fixed to the top of the mast of the rotary drilling rig. The drum D2 is rotatably mounted on the mounting bracket 1. One end of the tension spring D4 is fixed to the mounting bracket D1, and the other end is fixed to the pulley bracket D7, providing a pre-tightening force to ensure that the drum D2 always adheres to the wire rope D5. The travel switch D3 is installed below the mounting bracket D1. When the drill pipe touches the bottom and causes the wire rope D5 to loosen, the mounting bracket 1 moves downward under the tension of the tension spring D4, triggering the travel switch D3 to cut off the power of the hoist.

[0056] Among them, the mounting bracket D1 includes two symmetrically arranged pull plates D8 and a screw D9 passing through both pull plates D8. Self-locking nuts D10 are connected to both ends of the screw D9. The drum D2 is located between the two pull plates D8. In order to make the connection of the self-locking nut D10 reliable, a washer 11 is provided between the self-locking nut D10 and the pull plate D8.

[0057] A rotating shaft is provided on the pull plate D8, and a bearing D12 is installed on the rotating shaft. The drum D2 is sleeved outside the bearing D12. The inner ring of the bearing D12 is in interference fit with the rotating shaft, and the outer ring of the bearing D12 is in interference fit with the drum D2. Specifically, the rotating shaft includes an intermediate section D13 and edge sections D14. Both the intermediate section D13 and the edge sections D14 are cylinders. The diameter of the intermediate section D13 is larger than that of the edge sections D14. Two edge sections D14 are provided at both ends of the intermediate section D13 and are integrally formed with the intermediate section D13. A first mounting hole for the edge section D14 to pass through is opened on the pull plate D8. The diameter of the first mounting hole is generally slightly larger than the clearance fit between the edge section D14 and the edge section D14. The diameter of the first mounting hole is smaller than the diameter of the intermediate section D13. The tension spring 4 can be fixed to the edge section D14 outside the pull plate.

[0058] The drum D2 is a hollow structure with both ends penetrating. The inner ring of the drum D2 has a limiting portion D15. The limiting portion D15 can be a limiting ring integrally formed with the drum D2 or a limiting strip. The limiting portion D15 abuts against the outer ring of one end face of the bearing D12. A spacer sleeve D16 is sleeved on the intermediate section D13 of the rotating shaft. One side of the spacer sleeve D16 abuts against the inner ring of the other end face of the bearing D12, and the other side of the spacer sleeve D16 abuts against the pull plate 8. There is a clearance between the drum D2 and the pull plate D8.

[0059] A bent plate D17 is fixed on one of the pull plates D8. The bent plate D17 is L-shaped and is fixed to the pull plate D8 by bolts. The travel switch D3 is located below the bent plate D17. One end of the mounting bracket D1 away from the drum D2 is rotatably connected to the pulley bracket D7 through a fixed shaft D6. The pull plate D8 is provided with a first hole D18 for the screw to pass through and a second hole D19 for the fixed shaft D6 to pass through. The fixed shaft D6 is in interference fit with the second hole D19, and the fixed shaft D6 is rotatably connected to the pulley bracket D7.

[0060] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present invention. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0061] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0062] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present invention.

Claims

1. A rotary drilling rig with multi-cylinder pressurization, comprising a vehicle body platform, a mast, an adjusting mechanism for adjusting the mast angle, a power head, a power head pressurization cylinder, and a drill pipe assembly, characterized in that: It also includes a mast telescopic pressure cylinder and a connecting seat. One end of the mast telescopic pressure cylinder is connected to the mast, and the other end is connected to the connecting seat. The mast is slidably connected to the connecting seat so that the mast slides relative to the connecting seat when the mast telescopic pressure cylinder acts.

2. The rotary drilling rig with multi-cylinder pressurization according to claim 1, characterized in that: One mast telescopic pressure cylinder is arranged on each side of the power head, and the two mast telescopic pressure cylinders are symmetrically distributed on both sides of the power head pressure cylinder.

3. A rotary drilling rig with multi-cylinder pressurization according to claim 1, characterized in that: The vehicle body platform includes a drilling rig chassis, a crawler support connected to the drilling rig chassis, and crawlers installed on the crawler support; a rescue winch is installed on the drilling rig chassis. The rescue winch is located in front of or behind the drilling rig chassis, and the rescue winch is fixed on the drilling rig chassis or is fixed to the drilling rig chassis in a detachable manner.

4. A rotary drilling rig with multi-cylinder pressurization according to claim 3, characterized in that: The rescue winch includes a frame body, a hydraulic motor fixed on the frame body, a drum rotatably connected to the frame body, and a steel wire rope with one end fixed on the drum. The output shaft of the hydraulic motor rotates synchronously with the drum; a rotating rod is rotatably connected to the frame body. One end of the rotating rod is connected with a return spring, and the end of the return spring far from the rotating rod is fixed on the frame body. An abutting member for abutting the steel wire rope is provided on the rotating rod.

5. The rotary drilling rig with multi-cylinder pressurization according to claim 3, characterized in that: The crawler support is slidably connected to the drilling rig chassis. A double-rod piston cylinder is fixed inside the drilling rig chassis, and the two pistons of the double-rod piston cylinder are respectively connected to the crawler supports on both sides.

6. The rotary drilling rig with multi-cylinder pressurization according to claim 1, characterized in that: It also includes a boom. One end of the boom is rotatably connected to the mast, and the other end has a connecting portion for connecting a steel wire rope. A spring is connected near the middle of the boom. The end of the spring far from the boom is connected to the mast. The boom is in a horizontally extended state under the action of the spring. A fixing device is provided on the mast. When the boom overcomes the action of the spring and fits or approaches the mast, the fixing device locks the boom.

7. A rotary drilling rig with multiple oil cylinders for pressurization, characterized in that: A pulley frame is installed on the top of the mast, and an installation frame is installed on the pulley frame. A height limit switch is fixed inside the installation frame. The control rod of the height limit switch is connected with a counterweight so that the limit switch is in a normally open state under the counterweight. A limiting member is fixed on the installation frame, and the limiting member is located directly below the control rod to limit the maximum stroke of the control rod.

8. A rotary drilling rig with multi-cylinder pressurization according to claim 7, characterized in that: The control rod is connected to the counterweight through a first chain. A second chain is also provided on the pulley frame, and the other end of the second chain is connected to the counterweight. The limiting member passes through the link of the first chain.

9. The rotary drilling rig with multi-cylinder pressurization according to claim 1, characterized in that: It also includes: An installation bracket rotatably connected to the pulley frame; A drum rotatably installed on the installation bracket; A tension spring with one end fixed to the installation bracket and the other end fixed to the pulley frame, providing a pre-tightening force to ensure that the drum wheel always adheres to the steel wire rope; A travel switch installed below the installation bracket. When the drill pipe touches the bottom and causes the steel wire rope to loosen, the installation bracket moves downward under the tension of the tension spring, triggering the travel switch to cut off the power of the winch.

10. The rotary drilling rig with multi-cylinder pressurization according to claim 9, characterized in that: A rotating shaft is provided on the pull plate, and a bearing is installed on the rotating shaft. The drum is sleeved outside the bearing; a limiting portion is provided on the inner ring of the drum, and the limiting portion abuts against the outer ring of one end face of the bearing. A spacer sleeve is sleeved on the rotating shaft. One side of the spacer sleeve abuts against the inner ring of the other end face of the bearing, and the other side of the spacer sleeve abuts against the pull plate. There is a gap between the drum and the pull plate.

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