Drill rod retracting and releasing mechanism of lorry-mounted crane

Abstract

A drill rod retracting and releasing mechanism of a lorry-mounted crane belongs to the technical field of lorry-mounted cranes and comprises a lock catch assembly, a steel wire rope and an additional arm assembly. The lock catch assembly comprises a support, a clamping plate and a baffle. The support is fixed on the basic arm; the clamping plate is mounted on one surface of the support; the baffle is of an arc-shaped structure and hinged to the other face of the support. The other end of the steel wire rope is fixedly connected to the drill rod; the mounting arm assembly comprises a mounting arm mounting frame and a connecting assembly; the mounting arm mounting frame is mounted between the two-section arm and the basic arm in a sleeving manner, and the drill rod is movably connected with the mounting arm mounting frame through the connecting assembly. The drill rod linkage handle is operated, the drill rod is driven to rotate anticlockwise, the steel wire rope is wound around the drill rod to be screwed tightly, then the drill rod is stored in the position of the support and contained in the arc-shaped structure of the baffle, and the drill rod is supported by the clamping plate. Or the constraint of the baffle and the clamping plate is relieved, the drill rod is driven to rotate clockwise, the steel wire rope is loosened, and the drill rod is gradually lowered to the vertical state.

Description

Technical Field

[0001] The present invention relates to a drill pipe retracting and extending mechanism of a truck-mounted crane, belonging to the technical field of truck-mounted cranes. Background Art

[0002] With the development of engineering vehicle technology, integrating drill pipes on truck-mounted cranes has been widely applied and can be used for drilling in fields such as engineering construction and emergency rescue. This is an important innovation in the field of construction machinery in recent years. Through the design of functional integration, the operation efficiency and adaptability in complex construction scenarios have been significantly improved. However, during driving (when the drill pipe is in the retracted state), if the road surface jolts violently, the drill pipe will shake, sink, and even be bruised or damaged, affecting the operation quality of the drill pipe. Summary of the Invention

[0003] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and provide a drill pipe retracting and extending mechanism for a truck-mounted crane, ensuring smooth switching between the retracted and extended states of the drill pipe. Especially when the drill pipe is in the retracted state, it can be locked and fixed, is not prone to shaking and sinking with the vehicle, and avoids unnecessary damage.

[0004] The technical solution of the present invention is as follows:

[0005] A drill pipe retracting and extending mechanism of a truck-mounted crane, characterized by comprising: a locking component, a steel wire rope, a mounting arm component, etc. Among them: the locking component includes: a support, a clamping plate, and a baffle; the support is fixed on the basic arm, the clamping plate is installed on one side of the support for supporting the drill pipe; the baffle is in an arc structure, and one end of it is hinged to the other side of the support; one end of the steel wire rope is fixedly connected to the support, and the other end is fixedly connected to the drill pipe; the mounting arm component includes a mounting arm mounting frame and a connecting component; the mounting arm mounting frame is sleeved and installed between the second arm and the basic arm, and the drill pipe is movably connected to the mounting arm mounting frame through the connecting component.

[0006] By operating the drill pipe connection handle, driving the drill pipe to rotate counterclockwise, the steel wire rope winds around the drill pipe and tightens, and then the drill pipe is retracted to the position of the support. Moreover, the drill pipe is accommodated in the arc structure of the baffle, and the drill pipe is supported by the clamping plate; or, releasing the restraint of the baffle and the clamping plate, by operating the drill pipe connection handle, driving the drill pipe to rotate clockwise, the steel wire rope is relaxed, and the drill pipe is gradually lowered until it is in a vertical state.

[0007] Furthermore, the mounting arm mounting frame includes a fixing plate and a U-shaped plate. The two ends of the fixing plate are respectively connected to the two ends of the U-shaped plate through a plurality of bolts, so that the mounting arm mounting frame forms a ring and is sleeved and installed on the lifting arm.

[0008] Further, a U-shaped groove (i.e., U-shaped notch) for accommodating the drill pipe is provided at the bottom of the support. The top of the U-shaped groove is arc-shaped, and the diameter of the arc at the top of the U-shaped groove and the width of the straight groove are both larger than the outer diameter of the telescopic sleeve of the drill pipe.

[0009] Further, a pin-pulling assembly is provided on the support. The pin-pulling assembly is located on one side of the U-shaped groove and is used to prevent the baffle from rotating inward or outward to switch the working state of the baffle.

[0010] Further, the pin-pulling assembly includes a pin shaft, a bushing, a return spring, a split pin, and a handle. The bushing penetrates through the wall thickness of the support and is fixedly connected thereto. A circumferential step surface is provided on the outer wall of the pin shaft, and a limiting surface is provided on the inner wall of the cavity of the bushing. The pin shaft is sleeved in the cavity of the bushing, and the pin shaft and the bushing are in sliding fit. The return spring is sleeved outside the pin shaft, and the return spring is compressed between the step surface of the pin shaft and the limiting surface of the bushing. The split pin is installed at the tail end of the pin shaft to prevent the pin shaft from being driven by the force of the return spring to slide out of the bushing. The handle is provided at the tail end of the pin shaft.

[0011] By pulling the pin shaft outward to overcome the force of the return spring, the head end of the pin shaft retracts into the cavity of the bushing. At this time, the baffle can rotate freely without obstruction. When the pin shaft is released, under the action of the return spring force, the head end of the pin shaft extends out of the bushing and protrudes from the surface of the support, creating an obstacle to the rotation of the baffle and preventing the baffle from rotating inward or outward.

[0012] Further, the clamping plate is rotatably connected to the support through a clamping plate rotating shaft. Taking the clamping plate rotating shaft as the boundary, the clamping plate is divided into a long section and a short section. The end surface of the long section of the clamping plate is an arc concave surface for supporting the drill pipe. One end of a spring is connected to the short section of the clamping plate, and the other end of the spring is fixedly connected to the support.

[0013] Further, the arc concave surface of the long section of the clamping plate is provided with an upper vertex and a lower vertex, and both the upper vertex and the lower vertex are arc transition angles. The distance R between the upper vertex and the rotation center point of the clamping plate is greater than the distance C between the lower vertex and the rotation center point of the clamping plate.

[0014] Further, the connecting assembly includes a rocker arm, a first rotating shaft, and a second rotating shaft. The top of the rocker arm is rotatably connected to the bottom of the installation arm mounting frame through the first rotating shaft, enabling the rocker arm to swing left and right relative to the lifting arm. The bottom of the rocker arm is rotatably connected to the drill pipe through the second rotating shaft, enabling the drill pipe to swing back and forth relative to the lifting arm.

[0015] Further, the additional arm assembly further includes a station switching assembly, which includes a switching plate, a basic arm switching pull rod, and a secondary arm switching pull rod; the basic arm switching pull rod is fixed to the basic arm, and the secondary arm switching pull rod is fixed to the secondary arm; the switching plate is rotatably connected to the side wall of the additional arm mounting bracket through a switching plate rotating shaft. Taking the switching plate rotating shaft as the boundary, the switching plate is divided into a long section and a short section. First hooks and second hooks are respectively extended upward at both ends of the switching plate; the short section of the switching plate is close to the secondary arm switching pull rod and is connected to one end of a tension spring, and the other end of the tension spring is fixed to the side wall of the additional arm mounting bracket; on the long section of the switching plate, an inclined surface is provided at the bottom thereof for cooperating with the side of the swing arm.

[0016] During the storage process of the drill pipe, the swing arm is driven to swing upward. The side of the swing arm contacts the inclined surface at the bottom of the switching plate, overcoming the elastic force of the tension spring of the switching plate, causing the second hook of the short section of the switching plate to gradually disengage from the secondary arm switching pull rod. At the same time, the first hook of the long section of the switching plate hooks the basic arm switching pull rod, connecting the additional arm mounting bracket and the basic arm into one body; during the lowering process of the drill pipe, the swing arm swings downward and gradually separates from the switching plate. At the same time, the elastic force of the tension spring of the switching plate gradually resets, causing the first hook of the long section of the switching plate to gradually disengage from the basic arm switching pull rod, and hooking the second hook of the short section of the switching plate to the secondary arm switching pull rod, connecting the additional arm mounting bracket and the secondary arm into one body.

[0017] The working method of the drill pipe retracting and extending mechanism of the above-mentioned truck-mounted crane is as follows:

[0018] The initial state is that the drill pipe is in a stationary storage state, and the baffle is inside the pin pulling assembly. The pin pulling assembly can prevent the baffle from rotating outward, ensuring that the baffle always surrounds the drill pipe, which can play a role in blocking the drill pipe and preventing situations such as the drill pipe sinking due to severe bumps during driving.

[0019] (1) Lower the drill pipe

[0020] S1. Release the baffle insurance:

[0021] Pull the pin of the pin pulling assembly to drive the baffle to rotate outward (the baffle can automatically fall and rotate outward under the action of gravity) and cross the position of the pin pulling assembly to create space for the downward movement of the drill pipe; then release the pin pulling assembly. The pin of the pin pulling assembly is reset under the action of the return spring, and the pin extends out of the bushing and prevents the baffle from rotating inward (the baffle cannot cross the pin pulling assembly and return to the inside), ensuring that the baffle does not contact the gantry groove and creating space for the up and down movement of the drill pipe;

[0022] S2. Release the clamping plate insurance:

[0023] Operate the drill pipe connection handle to push forward (the drill pipe is lifted upward from the storage state), the drill pipe rotates counterclockwise, and the steel wire rope is continuously wound and tightened, that is, the distance L between the two fixed points of the straight part of the steel wire rope 1Shorten, and then the drill pipe is also lifted upward by the steel wire rope until the outer telescopic sleeve of the drill pipe crosses the upper vertex of the clamping plate and disengages from the clamping plate. The clamping plate rotates counterclockwise to be fixed under the action of spring force and gravity, and creates space for the downward movement of the drill pipe;

[0024] S3. Lower the drill pipe:

[0025] Pull the drill pipe connection handle backward, the drill pipe rotates clockwise, the steel wire rope is relaxed, and under the action of the gravity of the drill pipe, the distance L between the two fixed points at both ends of the straight part of the steel wire rope 2 lengthens, and the drill pipe slowly drops. When the outer telescopic sleeve of the drill pipe touches the upper vertex of the concave arc surface of the clamping plate, the clamping plate is pushed open counterclockwise by it, and the drill pipe can continue to drop until it is in a vertical state. At this time, the steel wire rope is completely released and disengages from the hook of the drill pipe under the action of tangential inertia;

[0026] S4. Switch the installation arm assembly to the second arm working position, that is, connect the installation arm mounting frame and the second arm into one body:

[0027] During the process of lowering the drill pipe to the vertical state, the swing arm swings down, and the side of the swing arm gradually separates from the inclined surface at the bottom of the switching plate. Under the action of gravity and the elastic force of the tension spring of the switching plate, the switching plate gradually resets, causing the switching plate to rotate counterclockwise until the drill pipe is vertical and the swing arm is also in a vertical state. At this time, the first hook on the long section of the switching plate disengages from the basic arm switching pull rod, while the second hook on the short section of the switching plate hooks the second arm switching pull rod, connecting the installation arm mounting frame and the second arm into one body;

[0028] S5. Move the drill pipe to the drilling position:

[0029] Push the telescopic arm connection handle to make the second arm move forward (it is recommended that the telescopic arm travel is 2.6 meters, with a reserve of 0.5 meters). The second arm drives the installation arm assembly, drill pipe, etc. to move forward together until the drill pipe reaches the drilling position.

[0030] (2) Drilling

[0031] Pull the drill pipe connection handle backward, the drill pipe rotates clockwise, and the drill bit starts to open the hole. As the hole depth increases, it is necessary to push the luffing connection handle forward to make the boom drop; to ensure that the drilling is in a vertical state, it is necessary to extend the second arm forward at the same time so that the center of the drill pipe always remains in the same position and vertical state;

[0032] When the jib rotates to the minimum angle, to increase the drilling depth, the outer telescopic sleeve of the drill pipe can be manually adjusted to lengthen the drill pipe;

[0033] After the drilling is completed, pull the luffing connection handle backward, slowly lift the boom to the horizontal state, and then pull the telescopic arm connection handle backward to retract the second arm until it stops.

[0034] (3) Store the drill pipe

[0035] S1. Drill pipe rising:

[0036] Connect the wire rope to the hook of the drill pipe, push the drill pipe coupling handle forward, the drill pipe rotates counterclockwise, the wire rope is tightened, and the length L of the straight part of the wire rope 1 decreases, driving the whole drill pipe to rotate towards the gantry groove of the support;

[0037] S2. The installation arm assembly is switched to the basic arm working position, that is, the installation arm mounting frame is integrated with the basic arm:

[0038] During the rising process of the drill pipe, the rocker arm is driven to swing and rise. The side of the rocker arm contacts the inclined surface at the bottom of the switching plate, overcoming the elastic force of the tension spring of the switching plate. The switching plate rotates clockwise, causing the second hook of the short section of the switching plate to gradually disengage from the second-section arm switching pull rod, while the first hook of the long section of the switching plate hooks the basic arm switching pull rod. The installation arm assembly and the drill pipe are disconnected from the second-section arm and integrated with the basic arm;

[0039] S3. Chuck plate insurance:

[0040] The drill pipe enters the gantry groove of the support and contacts the lower vertex f of the arc concave surface of the chuck plate. The chuck plate is pushed open clockwise by it, and the drill pipe can continue to rise until the outer telescopic sleeve of the drill pipe crosses the lower vertex f of the chuck plate and fits with the arc concave surface of the chuck plate. At this time, stop operating the drill pipe coupling handle. The arc concave surface of the chuck plate and the groove wall of the support gantry groove (the groove wall on the side far from the rotation center point of the chuck plate) cooperate together to support and lock the drill pipe firmly, making the drill pipe in a stored and stationary state;

[0041] S4. Baffle insurance

[0042] Pull the pin shaft of the pull-out pin assembly, drive the baffle to rotate inward across the pull-out pin position, and surround the outer circular surface of the drill pipe; then release the pin shaft, and the pin shaft resets under the action of the internal return spring and prevents the baffle from rotating outward (so that the baffle cannot cross the pull-out pin assembly and return to the outside), ensuring that the baffle always surrounds the drill pipe and accommodates the drill pipe in the arc-shaped structure of the baffle, playing an insurance role.

[0043] Furthermore, the distance from the rotation center point of the chuck plate to the groove wall on the far side of the support gantry groove is P, and the radius of the outer telescopic sleeve of the drill pipe is r; when the drill pipe is in the stored state, the connection line between the rotation center point of the chuck plate and the center point of the drill pipe (outer circular surface) is oa, the arc concave surface of the chuck plate is ef, the distance between the intersection point of oa and ef and the rotation center point o of the chuck plate is M, and the maximum distance between the rotation center point of the chuck plate and the outer telescopic sleeve of the drill pipe (on the far side) is M + 2r, then:

[0044] M + 2r > P ①;

[0045] The rising height required for the drill pipe to change from the storage state to the state where the clamping plate is unlocked is L. When the drill pipe is in the storage state, the reserved space height in the upper part of the portal groove (i.e., the distance between the top of the outer circular surface of the drill pipe and the highest point of the portal groove) is D. Then:

[0046] D > L ②.

[0047] Furthermore, when the drill pipe changes from the storage state to the state where the clamping plate is unlocked, the calculation method for the rising height L required for the drill pipe is as follows:

[0048] (1) Set the pushing angle of the drill pipe connection handle to be θ, and the duration to be t. According to the valve core flow curve graph, the total output flow can be deduced as:

[0049] V = K·θ·t ③,

[0050] where: the unit of the total output flow is L, and K is a proportionality constant;

[0051] (2) Given that the working displacement D of the drill pipe head, with the unit of ml / rev, the formula for obtaining the number of rotations N of the drill pipe is:

[0052] N = V·10 3 ÷ D ④,

[0053] (3) The formula for the change in length △L of the steel wire rope when it is wound is:

[0054] △L = 2·π·r·N ⑤,

[0055] where the unit of the change in length of the steel wire rope is mm, and r is the radius of the outer telescopic sleeve of the drill pipe, with the unit of mm;

[0056] (4) Set: when the drill pipe is in the storage state, the steel wire rope is in state a, and at this time the straight part length of the steel wire rope is L 1 , when the drill pipe is lifted to the state where the clamping plate is unlocked, the steel wire rope is in state b, and at this time the straight part length of the steel wire rope is L 2 , then:

[0057] △L = L 1 - L 2 ⑥;

[0058] (5) Set: the rising amount of the lower edge of the outer telescopic sleeve of the drill pipe is h 1 , the rising height of the drill pipe center is L, and when the steel wire rope is in state a, the horizontal distance between its two ends is S 1 , and assume it is a fixed value. Then:

[0059] h 1 = L ⑦;

[0060]

[0061] (6) From Equations ③, ④, ⑤, ⑥, ⑦, and ⑧, we get:

[0062]

[0063] The beneficial effects of the present invention are as follows:

[0064] 1) Modular integrated design, simple structure, and convenient installation

[0065] The latch assembly and the installation arm assembly are modularly integrated on the lifting arm to achieve rapid installation and disassembly, reducing the modification of the original machine structure.

[0066] 2) Power system adaptation

[0067] With the original hydraulic system parameters unchanged, by optimizing the control of the multi-way valve and reserving the drill pipe connection, the dynamic switching between the lifting and drilling functions is achieved.

[0068] 3) The drill pipe can be switched between work positions freely

[0069] By designing the left-right swing of the swing arm relative to the lifting arm, whether the side of the swing arm contacts the special-shaped edge (bevel) of the switching plate drives the switching plate to rotate around the axis, realizing the switching connection between the switching plate and the basic arm switching pull rod or the second-stage arm switching pull rod, and achieving the purpose of controlling the fixation or telescopic switching of the drill pipe;

[0070] 4) The drill pipe can be retracted and extended freely, and the latch assembly is safe and reliable

[0071] The clamping plate is tensioned through the pre-tightening force member, the spring is connected to the short section of the clamping plate, and the drill pipe is supported and clamped in the U-shaped groove of the support through the arc concave surface of the long section of the clamping plate;

[0072] There is a partial cavity at the top of the U-shaped groove of the support. Due to the rotation of the drill pipe itself, one end of the retracting wire rope is fixed on the triangular frame of the support, and the other end is fixed on the drill pipe; when the drill pipe is in the retracted state, continuing to drive the drill pipe to rotate, the wire rope will also continue to wind and tighten, the drill pipe is lifted at the top of the U-shaped groove, the drill pipe is separated from the clamping plate, and under the action of the spring, the long section of the clamping plate rotates downward and leaves a clearance space for the downward movement of the drill pipe, and the drill pipe moves downward due to gravity. Description of the drawings

[0073] Figure 1 It is a schematic structural diagram of the drill pipe in the vertical state in the present invention;

[0074] Figure 2 is Figure 1 the rear view of;

[0075] Figure 3 It is a schematic structural diagram of the drill pipe retracting and extending mechanism of the present invention;

[0076] Figure 4Schematic diagram of the drill pipe coupling handle in the present invention;

[0077] Figure 5 Schematic structure of the locking component in the present invention Figure 1 ;

[0078] Figure 6 Schematic diagram of the hook for fixing the steel wire rope on the drill pipe in the present invention;

[0079] Figure 7 Schematic structure of the locking component in the present invention Figure 2 ;

[0080] Figure 8 Schematic diagram of the structure of the additional arm assembly in the present invention (drill pipe in vertical state);

[0081] Figure 9 Schematic diagram when the drill pipe is lifted from the storage state to the state where the clamping plate is unlocked in the present invention;

[0082] Figure 10 Schematic diagram of the drill pipe being lowered when the clamping plate is in the unlocked state in the present invention;

[0083] Figure 11 Schematic diagram of the length change of the straight section of the steel wire rope when the drill pipe is lifted from the storage state to the state where the clamping plate is unlocked in the present invention;

[0084] Figure 12 Schematic diagram of the structure of the pin pulling component in the present invention;

[0085] Figures 13 - 15 Schematic diagram of the rocker arm and the switching plate in different contact states in the present invention;

[0086] Figure 16 Schematic diagram of the structure of the rocker arm in the present invention;

[0087] Figure 17 Schematic diagram of the structure of the switching plate in the present invention;

[0088] In the figure: steel wire rope 1, drill pipe coupling handle 2, drag chain 3, support 4, portal groove 4-1, clamping plate 5, baffle 6, pin pulling component 7, pin shaft 7-1, bushing 7-2, return spring 7-3, split pin 7-4, handle 7-5, basic arm 8, drill pipe 9, spring 10, additional arm mounting bracket 11, fixing plate 11-1, U-shaped plate 11-2, rocker arm 12, trigger protrusion 12-1, chamfered slope 12-2, long hypotenuse 12-3, first rotating shaft 13, second rotating shaft 14, switching plate 15, first hook 15-1, second hook 15-2, slope 15-3, front side edge 15-4, rear side edge 15-5, basic arm switching pull rod 16, second arm switching pull rod 17, second arm 18, tension spring 19, tripod 20, hook 21. Detailed implementation manners

[0089] A drill pipe retracting and extending mechanism for a truck-mounted crane, comprising: a locking component, a wire rope 1, a reinforced arm component, a drill pipe coupling handle 2, a drag chain 3, pipelines, a line bracket, etc.

[0090] 1. Regarding the locking component

[0091] The locking component includes: a support 4, a clamping plate 5, a baffle 6, and a pin pulling component 7.

[0092] (1) The support 4 is fixed on the basic arm 8 and is used to carry the entire locking component. A U-shaped groove 4-1 for storing the drill pipe is provided at the bottom of the support. The top of the U-shaped groove is arc-shaped, and the diameter of the top of the U-shaped groove and the width of the straight groove are both larger than the outer diameter of the telescopic sleeve of the drill pipe.

[0093] (2) The clamping plate is installed on one side of the support and is used to support and lock the drill pipe 9; the clamping plate 5 is rotatably connected to the support through a clamping plate rotating shaft. Taking the clamping plate rotating shaft as the boundary, the clamping plate is divided into a long section and a short section; the end face of the long section of the clamping plate is an arc concave surface for supporting the drill pipe; one end of a spring 10 is connected to the short section of the clamping plate, and the other end of the spring is fixedly connected to the support 4.

[0094] As Figure 9 shown, the arc concave surface of the long section of the clamping plate is provided with an upper vertex e and a lower vertex f, and both the upper vertex and the lower vertex are arc transition angles. The distance R between the upper vertex and the rotation center point of the clamping plate is greater than the distance C between the lower vertex and the rotation center point of the clamping plate.

[0095] (3) The baffle 6 is of an arc-shaped structure, and one end of it is hinged to the other side of the support. When the drill pipe 9 is in the retracted state, it is accommodated in the arc-shaped structure of the baffle to prevent the drill pipe from sinking due to road bumps when in the retracted state.

[0096] (4) The pin pulling component includes a pin shaft 7-1, a bushing 7-2, a return spring 7-3, a split pin 7-4, and a handle 7-5; the bushing penetrates through the wall thickness of the support 4 and is fixedly connected to it; a ring of stepped surface is provided on the outer wall of the pin shaft, and a limiting surface is provided on the inner wall of the cavity of the bushing; the pin shaft is sleeved in the cavity of the bushing, and the pin shaft and the bushing are in sliding fit; the return spring is sleeved on the pin shaft and is compressed between the stepped surface of the pin shaft and the limiting surface of the bushing; the split pin is installed at the tail end of the pin shaft to prevent the pin shaft from being driven by the return spring force and sliding out of the bushing, and the handle is arranged at the tail end of the pin shaft.

[0097] Pull the pin shaft to overcome the force of the return spring, retract the head end of the pin shaft into the cavity of the bushing, drive the baffle to rotate outward, creating space for the downward movement of the drill pipe. Release the pin shaft, and the pin shaft resets under the action of the return spring. The head end of the pin shaft extends out of the bushing and protrudes from the surface of the support, preventing the baffle from rotating inward and ensuring that the baffle does not contact the U-shaped groove, creating space for the up and down movement of the drill pipe. When the drill pipe is in the storage state, pull the pin shaft to drive the baffle to rotate inward and surround the outer cylindrical surface of the drill pipe. Release the pin shaft, and the pin shaft resets under the action of the spring, preventing the baffle from rotating outward and ensuring that the baffle always surrounds the drill pipe, accommodating the drill pipe within the arc-shaped structure of the baffle.

[0098] 2. Regarding the additional arm assembly

[0099] The additional arm assembly includes an additional arm mounting bracket 11, a connection assembly, and a station switching assembly.

[0100] (1) The additional arm mounting bracket is sleeved and installed between the second boom and the basic boom. As Figure 14 shown, the additional arm mounting bracket 11 includes a fixing plate 11-1 and a U-shaped plate 11-2. The two ends of the fixing plate are respectively connected to the two ends of the U-shaped plate by a number of bolts, forming a ring for the additional arm mounting bracket to be sleeved and installed on the lifting boom. Specifically, before installation, first extend the second boom a certain distance to create installation space for the additional arm mounting bracket. The U-shaped plate is buckled under the second boom from below, and the fixing plate is buckled above the second boom from above, and then the fixing plate and the U-shaped plate are connected.

[0101] (2) The drill pipe 9 is movably connected to the additional arm mounting bracket through the connection assembly. The connection assembly includes a rocker arm 12, a first rotating shaft 13, and a second rotating shaft 14. The top of the rocker arm 12 is rotationally connected to the bottom of the additional arm mounting bracket 11 through the first rotating shaft 13, enabling the rocker arm to swing left and right relative to the lifting boom. The bottom of the rocker arm 12 is rotationally connected to the drill pipe 9 through the second rotating shaft 14, enabling the drill pipe to swing forward and backward relative to the lifting boom.

[0102] (3) The station switching assembly includes a switching plate 15, a basic boom switching pull rod 16, and a second boom switching pull rod 17.

[0103] The basic boom switching pull rod 16 is fixed to the basic boom 8, and the second boom switching pull rod 17 is fixed to the second boom 18. The switching plate is rotationally connected to the side wall of the additional arm mounting bracket 11 through the switching plate rotating shaft. Taking the switching plate rotating shaft as the boundary, the switching plate is divided into a long section and a short section. The two ends of the switching plate respectively extend upward to be provided with a first hook 15-1 and a second hook 15-2.

[0104] The short section of the switching plate is close to the second boom switching pull rod and connects one end of the tension spring 19. The other end of the tension spring 19 is fixed to the side wall of the additional arm mounting bracket 11. The bottom of the long section of the switching plate is provided with an inclined surface that cooperates with the side of the rocker arm.

[0105] During the storage process of the drill pipe, the rocker arm is driven to swing and rise. The side of the rocker arm contacts the inclined surface at the bottom of the switching plate, overcoming the elastic force of the tension spring of the switching plate, so that the first hook at the long section of the switching plate hooks the basic arm switching pull rod, and the installation bracket of the additional arm is connected to the basic arm as a whole; during the lowering process of the drill pipe, the rocker arm swings and descends and gradually separates from the switching plate. At the same time, the elastic force of the tension spring of the switching plate is gradually reset, and the second hook at the short section of the switching plate hooks the second-stage arm switching pull rod, so that the installation bracket of the additional arm is connected to the second-stage arm as a whole.

[0106] 3. Regarding the wire rope

[0107] A tripod 20 is provided on the support, and a hook 21 is provided on the outer telescopic sleeve of the drill pipe; one end of the wire rope is fixedly connected to the support, and the other end is fixedly connected to the hook on the drill pipe.

[0108] By operating the drill pipe connection handle, the drill pipe is driven to rotate counterclockwise, so that the wire rope winds around the drill pipe and tightens, and then the drill pipe is stored in the position of the support, and the drill pipe is accommodated in the arc structure of the baffle, and the drill pipe is supported by the clamping plate; or, the restraint of the baffle and the clamping plate is released, and by operating the drill pipe connection handle, the drill pipe is driven to rotate clockwise, so that the wire rope loosens the drill pipe, and then the drill pipe is lowered to the vertical state.

[0109] 4. Related dimensional requirements of the clamping plate

[0110] In order to ensure that the drill pipe can always be clamped by the cooperation of the clamping plate and the groove wall of the U-shaped groove of the support when the drill pipe is in the storage static state, there are related dimensional requirements for the clamping plate.

[0111] (1) As Figure 9 shown, the radius of the outer telescopic sleeve of the drill pipe is r, and the distance from the rotation center point O of the clamping plate to the farther side groove wall of the U-shaped groove of the support is P; when the drill pipe is in the storage state, the connection line between the rotation center point of the clamping plate and the center point of the drill pipe (outer circular surface) is oa, the concave surface of the clamping plate arc is ef, and the distance between the intersection point of oa and ef and the rotation center point o of the clamping plate is M. The longest distance between the rotation center point O of the clamping plate and the outer telescopic sleeve of the drill pipe (farther side) is M + 2r, then there are:

[0112] M + 2r > P ①;

[0113] (2) When the drill pipe is lowered, the drill pipe needs to be moved upward first to cross the upper vertex e of the concave surface of the clamping plate arc, so that the drill pipe is not blocked by the clamping plate. The clamping plate can rotate counterclockwise under the spring retraction force, so that when the drill pipe falls, the drill pipe can push open the upper vertex e and continue to fall.

[0114] Therefore, the rising height required for the drill pipe to change from the storage state to the clamping plate unlocking state is L. When the drill pipe is in the storage state, the reserved space height at the upper part of the U-shaped groove (that is, the distance between the top of the outer circular surface of the drill pipe and the highest point of the U-shaped groove) is D, then there are:

[0115] D > L②.

[0116] 5. When the drill pipe moves from the storage state to the state where the chuck is unlocked, the calculation method for the rising height L required for the drill pipe is as follows:

[0117] (1) Set the pushing angle of the drill pipe joint handle to be θ, and the duration to be t. According to the valve core flow rate curve diagram, the total output flow rate can be deduced as:

[0118] V = K·θ·t③,

[0119] where: the unit of the total output flow rate is L, K is a proportionality constant determined by the valve characteristics, fluid properties, and pressure difference, and the unit is, for example, m3 / (°·S);

[0120] (2) Given the working displacement D of the drill pipe head, with the unit of ml / rev, the formula for the number of revolutions of the drill pipe is:

[0121] N = V·10 3 ÷D④,

[0122] (3) The steel wire rope is wound around the drill pipe. When the drill pipe rises from the storage state to the state where the chuck is unlocked, the length change

[0123] formula of the steel wire rope is:

[0124] △L = 2·π·r·N⑤,

[0125] where the unit of the length change of the steel wire rope is mm, and r is the radius of the outer telescopic sleeve of the drill pipe, with the unit of mm;

[0126] (4) Set: When the drill pipe is in the storage state, the steel wire rope is in state a, and at this time, the straight part length of the steel wire rope is L 1 , when the drill pipe is lifted to the state where the chuck is unlocked, the steel wire rope is in state b, and at this time, the straight part length of the steel wire rope is L 2 (The

[0127] straight part of the steel wire rope refers to the total length of the steel wire rope minus the length wound around the drill pipe), then:

[0128] △L = L 1 -L 2 ⑥;

[0129] As Figure 11 shown, the yellow line in the figure shows the drill pipe in the storage state, that is, the steel wire rope is in state a, and the cyan line shows the drill pipe rising to the state where the chuck is unlocked, leaving the upper vertex e of the chuck, that is, the steel wire rope is in state b.

[0130] (5) Set: The rising amount of the lower edge of the outer telescopic sleeve of the drill pipe is h 1, the upward displacement of the drill pipe center is L. When the wire rope is in state a, the horizontal distance between its two ends is S 1 , and a default value is assumed. Then there is:

[0131] h 1 = L⑦;

[0132]

[0133] (6) From equations ③, ④, ⑤, ⑥, ⑦, and ⑧, we get:

[0134]

[0135] 6. When the rocker arm contacts the switching plate, the angle should ensure that from the contact to the stop of the rocker arm swing, the second hook of the switching plate is completely disengaged from the second-stage arm switching pull rod, without hindering the telescoping of the second-stage arm, and the first hook coincides with the basic arm switching pull rod. In special cases, if the additional arm extends forward, it can be limited by the basic arm switching pull rod.

[0136] As Figure 16 shown, the rocker arm 12 is in the shape of a triangle with a larger upper part and a smaller lower part. A trigger protrusion 12-1 is provided at the top of the upper surface of the rocker arm. A chamfered inclined surface 12-2 is provided at the (left) end of the trigger protrusion. The chamfered inclined surface of the rocker arm is connected to the long hypotenuse 12-3 on the left side of the upper surface of the rocker arm to form the side edge on the left side of the rocker arm. As Figure 17 shown, the inclined surface 15-3 of the switching plate 15 includes a front side edge 15-4 and a rear side edge 15-5.

[0137] As Figure 13 shown, as state one, the rocker arm 12 and the switching plate 15 are initially in contact. At this time, the angle between the upper surface of the rocker arm and the vertical plane (i.e., the outer side surface of the switching plate) is 66.6°, and the chamfered inclined surface 12-2 on the upper surface of the rocker arm contacts the rear side edge 15-5 of the inclined surface of the switching plate.

[0138] As Figure 14 shown, as state two, the rocker arm 12 and the switching plate 15 are in the process of contact. As the rocker arm continues to turn up around the axis, the switching plate is pushed by the chamfered inclined surface 12-2 of the rocker arm and begins to rotate around the axis. When the angle between the upper surface of the rocker arm and the vertical plane (i.e., the outer side surface of the switching plate) reaches 98.8°, the long hypotenuse 12-3 on the left side of the upper surface of the rocker arm fits with the inclined surface 15-3 of the switching plate. After that, when the rocker arm is flipped, the long hypotenuse 12-3 on the left side of the upper surface of the rocker arm will contact the front side edge 15-4 of the inclined surface of the switching plate.

[0139] As Figure 15As shown in FIG. 3 , the rocker arm and the switch plate are no longer in contact, and the switch plate is fixed in place. When the angle between the upper surface of the rocker arm and the vertical plane (i.e., the outer side of the switch plate) is 105.4°, the drill pipe is clamped into the clamping plate, the movement stops, and the long oblique edge 12-3 on the left side of the upper surface of the rocker arm keeps in contact with the front side edge 15-4 of the inclined surface of the switch plate.

[0140] The present invention discloses a drill rod retracting and releasing mechanism for a truck-mounted crane, and its working method is as follows:

[0141] (1) Lowering the drill pipe

[0142] When the drill rod is in the stored static state, as the initial state, the baffle is on the inner side of the pin puller assembly, and the pin puller assembly can prevent the baffle from rotating outward, ensuring that the baffle always surrounds the drill rod, and can block the drill rod to prevent the vehicle from being violently bumpy during driving and the drill rod from sinking.

[0143] S1. Release the baffle insurance:

[0144] Pull the pin of the pin pulling assembly to drive the baffle to rotate outward (the baffle can automatically fall and rotate outward under the action of gravity) and pass the pin pulling position to make room for the drill rod to move downward; then release the pin pulling assembly, the pin is reset under the action of the internal reset spring, the pin extends out of the sleeve, and prevents the baffle from rotating inward (the baffle cannot pass the pin pulling assembly back to the inside), ensuring that the baffle does not contact the gate-shaped slot, making room for the drill rod to move up and down;

[0145] S2. Release the card board insurance:

[0146] The drill rod handle is pushed forward (the drill rod is lifted upward from the storage state), the drill rod rotates counterclockwise, and the wire rope is continuously wound and tightened, that is, the distance between the fixed points at both ends of the straightened part of the wire rope is L 1 Shorten (such as Figure 6 ), then the drill rod is also lifted upward by the wire rope until the outer telescopic sleeve of the drill rod passes the upper vertex of the clamping plate and is separated from the clamping plate. The clamping plate rotates counterclockwise to be fixed under the action of the spring force, and makes room for the drill rod to go down;

[0147] S3, Drop drill pipe:

[0148] Pull the drill rod handle backward, the drill rod rotates clockwise, the wire rope is loosened, and under the gravity of the drill rod, the distance between the fixed points at both ends of the straightened part of the wire rope is L 2 The drill rod is stretched and falls slowly downward. When the telescopic sleeve outside the drill rod touches the upper vertex of the arc concave surface of the clamping plate, the clamping plate is pushed open counterclockwise, and the drill rod can continue to fall until it is vertical. At this time, the wire rope is completely released and detached from the hook of the drill rod under the action of tangential inertia.

[0149] S4. Switch the mounting arm assembly to the second-section arm position, that is, the mounting arm mounting frame is connected to the second-section arm as a whole:

[0150] During the process of lowering the drill pipe to the vertical state, the swing arm swings downwards, and the side of the swing arm gradually separates from the inclined surface at the bottom of the switching plate. Under the action of gravity and the gradually restoring force of the tension spring of the switching plate, the switching plate rotates counterclockwise until the drill pipe is vertical and the swing arm is also in the vertical state. At this time, the first hook on the long section of the switching plate disengages from the basic arm switching pull rod, while the second hook on the short section of the switching plate hooks the second arm switching pull rod, connecting the installation bracket of the additional arm to the second arm as a whole;

[0151] S5. The drill pipe moves to the drilling position:

[0152] Push the telescopic arm joint handle to make the second arm move forward (it is recommended that the telescopic arm stroke is 2.6 meters, with a reserve of 0.5 meters). The second arm drives the additional arm assembly, drill pipe, etc. to move forward together until the drill pipe reaches the drilling position.

[0153] (2) Drilling

[0154] Pull the drill pipe joint handle backward, the drill pipe rotates clockwise, and the drill bit starts to open the hole. As the hole depth increases, it is necessary to push the luffing joint handle forward to make the boom drop; to ensure that the drilled hole is vertical, it is necessary to extend the second arm forward at the same time to keep the center of the drill pipe in the same position and vertical state all the time.

[0155] When the boom rotates to the minimum angle, to increase the drilling depth, the outer telescopic sleeve of the drill pipe can be manually adjusted to lengthen the drill pipe.

[0156] After the drilling is completed, pull the luffing joint handle backward, slowly lift the boom to the horizontal state, and then pull the telescopic arm joint handle backward to retract the second arm until it stops.

[0157] (3) Storing the drill pipe

[0158] S1. The drill pipe rises:

[0159] Connect the steel wire rope to the hook of the drill pipe, push the drill pipe joint handle forward, the drill pipe rotates counterclockwise, the steel wire rope is tightened, and the length L of the straight part of the steel wire rope 1 decreases, driving the whole drill pipe to rotate towards the gantry groove of the support;

[0160] S2. The additional arm assembly is switched to the basic arm working position, that is, the installation bracket of the additional arm is connected to the basic arm as a whole:

[0161] During the rising process of the drill pipe, it drives the swing arm to swing upward. The side of the swing arm contacts the inclined surface at the bottom of the switching plate (as shown in Figure 13 、 Figure 14 、 Figure 15As shown, overcoming the elastic force of the tension spring of the switching plate, the switching plate rotates clockwise, so that the first hook of the long section of the switching plate hooks the basic arm switching pull rod, and the additional arm assembly and the drill pipe are disconnected from the second arm and integrated with the basic arm;

[0162] S3. Chuck insurance:

[0163] The drill pipe enters the portal groove of the support and contacts the lower vertex f of the concave surface of the arc of the chuck. The chuck is pushed open clockwise by it, and the drill pipe can continue to rise until the outer telescopic sleeve of the drill pipe passes over the lower vertex f of the chuck and fits with the concave surface of the arc of the chuck. At this time, stop operating the drill pipe connection handle. The concave surface of the arc of the chuck and the groove wall of the portal groove of the support (the groove wall on the side far from the rotation center point of the chuck) cooperate together to support and lock the drill pipe firmly, so that the drill pipe is in a stored and static state;

[0164] S4. Baffle insurance

[0165] Pull the pin shaft of the pull-out pin assembly to drive the baffle to rotate inward beyond the pin position and surround the outer cylindrical surface of the drill pipe; then release the pin shaft, and the pin shaft is reset under the action of the internal return spring and prevents the baffle from rotating outward (so that the baffle cannot cross the pull-out pin assembly and return to the outside), ensuring that the baffle always surrounds the drill pipe and accommodates the drill pipe in the arc-shaped structure of the baffle, playing an insurance role.

Claims

1. A drill rod retracting and releasing mechanism for a truck-mounted crane, characterized in that: include: The locking assembly comprises: a support, a clamping plate, and a baffle; the support is fixed on the basic arm, the clamping plate is installed on one side of the support, and is used to support the drill rod; the baffle is an arc-shaped structure, one end of which is hinged to the other side of the support; A steel wire rope, one end of which is fixedly connected to the support, and the other end of which is fixedly connected to the drill pipe; The mounting arm assembly comprises a mounting arm mounting frame and a connecting assembly; the mounting arm mounting frame is sleeved and installed between the second-section arm and the basic arm, and the drill rod is movably connected to the mounting arm mounting frame through the connecting assembly; By operating the drill rod connecting handle, the drill rod is driven to rotate counterclockwise, so that the wire rope is wrapped around the drill rod and tightened, and then the drill rod is stored in the support position, and the drill rod is accommodated in the arc structure of the baffle, and the drill rod is supported by the clamping plate; or, the baffle and the clamping plate are released, and the drill rod is driven to rotate clockwise by operating the drill rod connecting handle to loosen the wire rope and gradually lower the drill rod to a vertical state.

2. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 1, characterized in that: The bottom of the support is provided with a gate-shaped groove for accommodating the drill rod, and the top of the gate-shaped groove is arc-shaped.

3. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 2, characterized in that: The support is provided with a pin pulling assembly, which is located on one side of the gate-shaped groove and is used to prevent the baffle from rotating inwards or outwards.

4. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 2 is characterized in that: The clamping plate is rotatably connected to the support via a clamping plate rotating shaft, and the clamping plate is divided into a long section and a short section with the clamping plate rotating shaft as the boundary; the end face of the long section of the clamping plate is an arc concave surface, which is used to support the drill rod; the short section of the clamping plate is connected to one end of the spring, and the other end of the spring is fixedly connected to the support.

5. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 4 is characterized in that: The long section of the clamping plate has an arc concave surface with an upper vertex and a lower vertex, and both the upper vertex and the lower vertex are arc transition angles.

6. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 5, characterized in that: The distance between the upper vertex and the rotation center of the card plate is greater than the distance between the lower vertex and the rotation center of the card plate.

7. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 6, characterized in that: The distance from the rotation center of the card plate to the groove wall on the far side of the support gate-shaped groove is P, and the radius of the outer telescopic sleeve of the drill rod is r; the maximum distance between the rotation center of the card plate and the far side of the outer telescopic sleeve of the drill rod is M+2r, then: M+2r>P①; The required height of the drill rod from the stowed state to the unlocked state of the clamping plate is L; when the drill rod is in the stowed state, the height of the space reserved in the upper part of the gate-shaped slot is D, then: D>L②.

8. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 7, characterized in that: When the drill rod is moved from the stowed state to the unlocked state, the calculation method for the required rise height L of the drill rod is as follows: (1) Set the push angle of the drill pipe handle to be operated as θ and the duration as t. The total output flow can be derived from the valve core flow curve: V=K·θ·t③, Among them: the unit of the total output flow is L, K is the proportional constant; (2) Given the working displacement D of the drill head, in ml / rev, the formula for obtaining the number of drill pipe rotations N is: N=V·10 3 ÷D④, (3) When the wire rope is wound, the formula for the length change △L is: △L=2·π·r·N⑤, Among them, the unit of wire rope length change is mm, r is the radius of the telescopic casing outside the drill pipe, the unit is mm; (4) Assumption: When the drill rod is in the stowed state, the wire rope is in state a, at which the length of the straightened portion of the wire rope is L1. When the drill rod is lifted to the unlocked state of the clamping plate, the wire rope is in state b, at which the length of the straightened portion of the wire rope is L2. Then: △L=L1-L2⑥; (5) Assume that the rise of the lower edge of the telescopic casing outside the drill pipe is h1, the rise height of the drill pipe center is L, and when the wire rope is in state a, the horizontal distance between its two ends is S1, and the default value is used, then: h1=L⑦; (6) From equations ③, ④, ⑤, ⑥, ⑦, and ⑧, we get:

9. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 1, characterized in that: The connecting assembly includes a rocker arm, a first rotating shaft, and a second rotating shaft; the top of the rocker arm is rotatably connected to the bottom of the mounting arm mounting bracket via the first rotating shaft, so that the rocker arm can swing left and right relative to the crane arm; the bottom of the rocker arm is rotatably connected to the drill rod via the second rotating shaft, so that the drill rod can swing forward and backward relative to the crane arm.

10. The drill rod retracting and releasing mechanism of a truck-mounted crane according to claim 9, characterized in that: The mounting arm assembly further includes a station switching assembly, and the station switching assembly includes a switching plate, a basic arm switching rod, and a second-section arm switching rod; The basic arm switching rod is fixed on the basic arm, and the second-section arm switching rod is fixed on the second-section arm; the switching plate is rotatably connected to the side wall of the mounting arm mounting frame through the switching plate rotating shaft, and the switching plate is divided into a long section and a short section with the switching plate rotating shaft as the boundary, and the two ends of the switching plate are respectively extended upward to be provided with a first hook and a second hook; The short section of the switching plate is close to the second-section arm switching rod and connected to one end of the tension spring, and the other end of the tension spring is fixed to the side wall of the mounting arm mounting frame; the long section of the switching plate has an inclined surface at the bottom that matches the side of the rocker arm; During the storage process of the drill rod, the rocker arm is driven to swing upward, and the side of the rocker arm contacts the inclined surface at the bottom of the switching plate, overcoming the tension spring force of the switching plate, so that the first hook of the long section of the switching plate hooks the basic arm switching rod, and the additional arm mounting frame is connected to the basic arm as a whole; During the lowering process of the drill rod, the rocker arm swings down and gradually separates from the switching plate. At the same time, the tension spring force of the switching plate gradually resets, hooking the second hook of the short section of the switching plate onto the switching rod of the second arm, so that the additional arm mounting frame is connected to the second arm as a whole.

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