Engineering machine, telescopic arm and telescopic arm arm code detection device

Abstract

The utility model relates to engineering machinery technical field discloses a kind of engineering machinery, telescopic arm and telescopic arm arm code detection device, wherein, telescopic arm arm code detection device includes support, pin shaft being installed on support and extending along first direction, spring being sleeved on pin shaft and fixed frame being installed to pin shaft and being opposite with support interval, spring is abutted to support and fixed frame, to when fixed frame can overcome spring elasticity and move along pin shaft towards the support when bearing pressure towards support, wherein, fixed frame is installed with guiding structure being arranged mutually interval in second direction perpendicular to first direction and inductive unit being arranged between guiding structure, guiding structure includes rolling element being installed on fixed frame, to when telescopic joint arm telescopes along second direction, it can be guided by the rolling element so that arm code block on it extrudes fixed frame, and telescopic state of telescopic joint arm is inducted by inductive unit, to avoid the situation that friction occurs between rolling element and arm code block.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically to a telescopic boom arm code detection device. Based on this, this utility model also relates to a telescopic boom and engineering machinery including the telescopic boom arm code detection device. Background Technology

[0002] Medium and large-sized cranes are widely used in various industries such as construction, transportation, power, mining, ports, and oil and gas. These cranes are equipped with booms that have high lifting capacity and a large operating radius, enabling them to perform heavy-duty handling and hoisting operations in complex and high-risk environments, meeting the demands of high-intensity working conditions. The extension and retraction of the boom is typically accomplished by a single-cylinder pin-operated extension mechanism housed within the boom cylinder. This mechanism mainly consists of a hydraulic cylinder and a pin mechanism. When the boom code detection device on the hydraulic cylinder detects that the cylinder pin is aligned with the pin hole at the bottom of the nth boom section (the outermost boom section is the 1st section), the pin mechanism drives the cylinder pin to insert into the corresponding pin hole, connecting the hydraulic cylinder to the nth boom section. Subsequently, a pin-pulling device pulls out the boom pin of the nth boom section to release the lock between it and the (n-1)th section, allowing the hydraulic cylinder to drive the nth boom section to extend and retract.

[0003] like Figure 1 and Figure 2 As shown, the existing arm code detection device mainly includes a support 1', a pin 2' fixed on the support 1', a slider 3' slidably connected to the pin 2', and a spring 4' set between the support 1' and the slider 3' and sleeved on the pin 2'. The slider 3' has chamfered ends. During the extension and retraction of the boom, the chamfers of the slider 3' interact with the arm code block at the tail of the boom, avoiding frontal impact. When pressed by the arm code block, the slider 3' moves along the pin 2' towards the support 1', thereby identifying the arm code position. However, since the slider 3' is mostly made of nylon, it is difficult to guarantee processing precision. Furthermore, the slider 3' needs to form a sliding fit with the arm code block and the pin during use, making it prone to burrs forming on the contact surfaces, leading to increased friction. In severe cases, this can result in poor sliding or jamming, affecting the accuracy of the arm code signal recognition and the reliability of the entire extension control system. Utility Model Content

[0004] The purpose of this utility model is to overcome the aforementioned technical problems existing in the prior art.

[0005] The first aspect of this utility model provides a telescopic arm code detection device, including a support, a pin mounted on the support and extending along a first direction, a spring sleeved on the pin, and a fixed frame mounted to the pin and spaced apart from the support. The spring abuts against the support and the fixed frame so that when the fixed frame is subjected to pressure toward the support, it can overcome the elastic force of the spring and move toward the support along the pin. The fixed frame is equipped with guide structures arranged at intervals in a second direction perpendicular to the first direction and sensing units disposed between the guide structures. The guide structures include rolling elements mounted on the fixed frame so that when the telescopic arm extends or retracts along the second direction, the rolling elements can guide the arm code blocks thereon to press against the fixed frame, and the sensing unit senses the extension or retraction state of the telescopic arm.

[0006] Optionally, the rolling element includes a first roller extending along a third direction perpendicular to the first and second directions and rotatably mounted on the frame. The first roller protrudes outward from the side of the frame opposite to the support so as to act on the outer peripheral surface of the first roller when the telescopic arm extends or retracts along the second direction.

[0007] Optionally, the guide structure further includes a second roller arranged parallel to the first roller and rotatably mounted on the fixed frame, wherein the first roller and the second roller are offset from each other in a first direction.

[0008] Optionally, a mounting plate located between the guide structures is installed on the mounting bracket. Multiple sensing units are mounted on the mounting plate, and the surface of the mounting plate facing away from the support is perpendicular to the first direction and further away from the support relative to the first roller and the second roller along the first direction.

[0009] Optionally, the mounting bracket has a top plate and a bottom plate spaced apart from each other in a third direction, and a first side plate and a second side plate spaced apart from each other in a second direction, connected between the top plate and the bottom plate on the side facing the support, wherein the first side plate and the second side plate are respectively connected to the support by pins and springs sleeved on the respective pins.

[0010] Optionally, the top plate and the bottom plate each have inclined guide surfaces facing away from the support at both ends along the second direction, and a plane extending along the second direction is formed between the inclined guide surfaces. The guide structure is installed on the top plate and the bottom plate at positions corresponding to the inclined guide surfaces, and the mounting plate is installed on the top plate and the bottom plate at positions corresponding to the plane.

[0011] Optionally, the first roller, the second roller, and the mounting plate are all made of nylon.

[0012] Optionally, a sliding sleeve is provided in the through hole on the fixing bracket for inserting the pin, and the pin is slidably connected in the sliding sleeve.

[0013] The second aspect of this utility model provides a telescopic boom, including a boom body having multiple telescopic arms, an arm code block disposed on the telescopic arms, and a telescopic boom arm code detection device as described above.

[0014] A third aspect of this utility model provides an engineering machine that employs a telescopic boom as described above.

[0015] Through the above technical solution, the rolling element of this utility model can roll synchronously with the movement of the arm code block when it contacts the arm code block, thereby avoiding the sliding friction caused by the relative sliding between the rolling element and the arm code block. Compared with the existing structure that relies on the sliding contact between the nylon block and the arm code block, this utility model significantly reduces the frictional resistance through rolling contact, effectively avoiding the jamming problem caused by the difficulty in controlling the processing accuracy of the nylon block or the burrs caused by surface wear. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of an existing arm code detection device; Figure 2 This is a side view diagram of an existing arm code detection device; Figure 3 This is a three-dimensional structural diagram of the telescopic arm code detection device of this utility model. Figure 4 This is a side view of the telescopic arm code detection device of this utility model. Figure 5 This is a schematic diagram of the half-section structure of the telescopic arm code detection device of this utility model and the angle of entry with the arm code block.

[0017] Explanation of reference numerals in the attached figures 1. Support; 2. Pin; 3. Spring; 4. Fixing frame; 401. Top plate; 402. Bottom plate; 403. First side plate; 404. Second side plate; 405. Inclined guide surface; 406. Plane; 5. Mounting plate; 601. First roller; 602. Second roller; 7. Arm block; 8. Sliding sleeve; 9. Sensing unit; 10. Spring seat. Detailed Implementation

[0018] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0019] like Figure 3 and Figure 4As shown, the telescopic arm code detection device of this utility model includes a support 1, a pin 2, a spring 3, and a fixing frame 4. Specifically, one end of the pin 2 is fixedly installed on the support 1, and the other end is slidably connected to the fixing frame 4, so that the fixing frame 4 can move towards the support 1 in a first direction. The spring 3 is sleeved on the pin 2, and its two ends abut against the support 1 and the fixing frame 4 respectively, so that the fixing frame 4 and the support 1 can be arranged at intervals along the first direction. When the fixing frame 4 is subjected to pressure in the direction of the support 1, it can overcome the elastic force of the spring 3 and move along the direction of the pin 2. Correspondingly, when the pressure decreases, the spring 3 drives the fixing frame 4 to automatically reset.

[0020] The fixed frame 4 is provided with guide structures arranged at intervals along a second direction perpendicular to the first direction (i.e., the extension and retraction direction of the telescopic arm), and sensing units 9 installed between the guide structures. The guide structures include rolling elements mounted on the fixed frame 4. Figure 3 and Figure 5 As shown, when the telescopic boom extends or retracts along the second direction, the boom block 7 will first contact the rolling element. During this process, the force exerted by the boom block 7 on the outer circumferential surface of the rolling element can be decomposed into two components: a tangential component along the outer circumferential surface of the rolling element and an axial component along the first direction. The axial component acts on the fixed frame 4, causing it to move towards the support 1, thus guiding and compressing the boom block 7. The sensing unit 9 detects the extension / retraction state of the telescopic boom, providing feedback to the operator on whether the predetermined position has been reached, ensuring the accuracy and safety of the boom extension / retraction process. The tangential component drives the rolling element to rotate around its own axis, causing it to roll synchronously with the boom block 7, thereby avoiding friction caused by relative sliding between the rolling element and the boom block 7.

[0021] Therefore, compared to the existing technology that relies on sliding contact between the nylon block and the arm block 7, this invention significantly reduces frictional resistance through rolling contact, effectively avoiding jamming problems caused by difficulty in controlling the machining accuracy of the nylon block or burrs caused by surface wear. In addition, the rolling structure can also disperse and weaken the radial load transmitted from the fixed frame 4 to the pin 2 to a certain extent, thereby reducing the risk of long-term stress deformation of the pin 2 and extending the service life of the device.

[0022] Furthermore, such as Figure 3 As shown, the rolling element in this invention may include a first roller 601 extending along a third direction perpendicular to the first and second directions. The first roller 601 can be rotatably mounted to the fixed frame 4 in various ways. Preferably, the fixed frame 4 is provided with a rotating shaft extending along the third direction. Both ends of the rotating shaft can be connected to the fixed frame 4 via bearing structures or threaded connections, thereby allowing the rotating shaft to be mounted on the fixed frame 4 in a rotatable or fixed manner, ensuring both structural stability and functional flexibility.

[0023] The first roller 601 can be a hollow cylindrical structure, with its interior fitted onto the outer circumferential surface of the aforementioned rotating shaft. Specifically, when the rotating shaft can rotate freely relative to the fixed frame 4, the first roller 601 can be connected to the rotating shaft via an interference fit or a key connection, allowing the first roller 601 to rotate with the rotating shaft, thus satisfying the requirement that the first roller 601 can rotate relative to the fixed frame 4. When the rotating shaft is fixedly mounted on the fixed frame 4 and cannot rotate, the inner diameter of the first roller 601 is slightly larger than the outer diameter of the rotating shaft, forming a clearance fit or a rolling element (such as a needle roller bearing) between them, allowing the first roller 601 to rotate freely relative to the rotating shaft, thus satisfying the requirement that the first roller 601 can rotate relative to the fixed frame 4. Therefore, both installation methods ensure that the first roller 601 maintains good rolling performance, effectively preventing relative slippage between the first roller 601 and the arm block 7.

[0024] In addition, the first roller 601 is configured such that at least a portion of it protrudes from the fixed frame 4 in a third direction toward the side away from the support 1, so that during the extension and retraction of the telescopic arm in the second direction, the arm block 7 on it can first contact the first roller 601 and apply a thrust to its outer peripheral surface, thereby guiding the first roller 601 to roll and drive the fixed frame 4 to move toward the support 1.

[0025] In some embodiments, the guide structure may further include a second roller 602 arranged parallel to the first roller 601 and rotatably mounted on the fixed frame 4. Preferably, combined with Figure 4 and Figure 5 The second roller 602 is staggered relative to the first roller 601 in the first direction and is located closer to the support 1, so that the second roller 602 can play a guiding transition role in the initial contact of the arm block 7, guiding the arm block 7 to smoothly cut into the position of the first roller 601, thereby reducing the instantaneous impact force on the first roller 601, further optimizing the guiding process, and improving the stability of rolling contact and the durability of the overall structure.

[0026] In practical applications, different types of engineering machinery or telescopic boom structures of different specifications may have differences in the size of the boom block 7, installation height, movement trajectory, or tail structure. Furthermore, manufacturing tolerances, assembly deviations, or wear and deformation of the boom block 7 during use may also cause the contact angle (i.e., the engagement angle α) between the boom block 7 and the rolling element to deviate from the design value. To adapt to these structural differences and changes in working conditions, such as... Figure 5As shown, this utility model can adjust the cutting angle α of the arm block 7 by changing the distance between the axes of the first roller 601 and the second roller 602 along the first direction or by increasing / decreasing the diameter of the second roller 602, so as to adapt to the cutting path of different arm blocks 7. It can also alleviate the impact load caused by the cutting angle deviation to a certain extent, and improve the adaptability and operational stability of the device on multiple models of telescopic arms.

[0027] In some embodiments, such as Figure 3 As shown, a mounting plate 5 is installed on the fixed frame 4 between the guide structures. Multiple sensing units 9 are mounted on this mounting plate 5. The surface of the mounting plate 5 facing away from the support 1, i.e., the sensing surface, is perpendicular to the first direction and further away from the support 1 relative to the first roller 601 and the second ball bearing along the first direction. This allows the sensing unit 9 to quickly and accurately sense the position of the arm code block 7 after the rolling element guides it to a position close to the sensing surface, avoiding response delays or signal misjudgments caused by the sensing surface being too close to the support 1 due to its rearward position. Simultaneously, the arrangement of multiple sensing units 9 also improves the detection coverage and accuracy.

[0028] In this invention, the fixing bracket 4 can have various adaptable structures to meet different installation and guiding requirements. For example... Figure 3 and Figure 4 In the embodiment shown, the fixing frame 4 includes a top plate 401 and a bottom plate 402 spaced apart from each other in a third direction. The rolling element is rotatably disposed in the space between the top plate 401 and the bottom plate 402, thereby structurally forming a stable support and limiting installation for the rolling element.

[0029] Furthermore, the fixing frame 4 has a first side plate 403 and a second side plate 404 on the side facing the support 1, which are connected between the top plate 401 and the bottom plate 402 and are spaced apart from each other along the second direction. The first side plate 403 and the second side plate 404 are respectively connected to the support 1 by a pin 2, and the pin 2 passes through the through holes on the two side plates. The two ends of the spring 3 sleeved on the pin 2 abut against the first side plate 403 and the support 1 and the second side plate 404 and the support 1, thereby realizing the slidable connection of the fixing frame 4 relative to the support 1, ensuring the mobility of the fixing frame 4 after being subjected to force, and also providing an effective constraint path for the compression and rebound of the spring 3.

[0030] Preferably, a sliding sleeve 8 can be provided in the above-mentioned through hole, and the pin 2 is installed in the sliding sleeve 8 by sliding, so that the sliding between the fixing frame 4 and the pin 2 is smoother, and the sliding sleeve 8 can reduce the wear between the pin 2 and the side plate to a certain extent, thereby improving the service life and operational stability of the structure.

[0031] Furthermore, a spring seat 10 can be provided at the end of the through hole facing the support 1 to limit the position of the spring 3 and provide reliable axial support, so that the spring 3 will not shift or deform during compression, further improving the transmission efficiency of the spring 3 force and the overall response consistency of the structure. The spring seat 10 can be integrally formed with the sliding sleeve 8, such as... Figure 5 As shown, the spring seat 10 is formed at one end of the sliding sleeve 8 facing the support 1.

[0032] Furthermore, the top plate 401 and the bottom plate 402 are respectively provided with inclined guide surfaces 405 facing away from the support 1 at both ends along the second direction, and a plane 406 extending along the second direction is provided between the two inclined guide surfaces 405. The guide structure is preferably installed at the position corresponding to the inclined guide surface 405 so as to guide the arm block 7 to achieve a smooth transition before approaching the rolling body; the mounting plate 5 is provided at the position corresponding to the plane 406, and is used to arrange multiple sensing units 9 to achieve accurate detection of the position of the arm block 7.

[0033] Combination Figure 5 The outer peripheral surfaces of the first roller 601 and the second roller 602 are both designed to protrude slightly away from the support 1 relative to the inclined guide surface 405, so that the rollers can preferentially contact the arm block 7 during the approach process of the arm block 7 and avoid direct contact between it and the inclined guide surface 405, effectively reducing impact wear and improving guiding stability and service life.

[0034] Furthermore, in a preferred embodiment of this invention, the first roller 601, the second roller 602, and the mounting plate 5 can all be made of nylon. Nylon material has good wear resistance, self-lubricating properties, and impact resistance, reducing wear and noise generated during operation, while improving the smoothness of rolling and the service life of the structure. Using nylon for the mounting plate 5 can also effectively avoid metal interference, improve the stability and anti-interference ability of the sensing unit 9, and further enhance the reliability and safety of the entire detection device.

[0035] A second aspect of this utility model provides a telescopic boom, including a boom body having multiple telescopic segments, boom code blocks 7 disposed on the telescopic segments, and a telescopic boom code detection device as described above. The telescopic boom code detection device is used to detect whether the telescopic segments have reached a predetermined position.

[0036] The third aspect of this utility model provides an engineering machine, including the telescopic boom as described above.

[0037] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and all fall within the protection scope of the present invention.

Claims

1. A telescopic arm code detection device, characterized in that, The device includes a support (1), a pin (2) mounted on the support (1) and extending in a first direction, a spring (3) sleeved on the pin (2), and a fixed frame (4) mounted on the pin (2) and spaced apart from the support (1). The spring (3) abuts against the support (1) and the fixed frame (4) so ​​that when the fixed frame (4) is subjected to pressure toward the support (1), it can overcome the elastic force of the spring (3) and move along the pin (2) toward the support (1). The fixed frame (4) is equipped with guide structures arranged at intervals in a second direction perpendicular to the first direction and sensing units (9) disposed between the guide structures. The guide structures include rolling elements mounted on the fixed frame (4) so ​​that when the telescopic arm extends and retracts in the second direction, the rolling elements can guide the arm block (7) on it to press against the fixed frame (4), and the sensing unit (9) senses the extension and retraction state of the telescopic arm.

2. The telescopic arm code detection device according to claim 1, characterized in that, The rolling element includes a first roller (601) extending along a third direction perpendicular to the first and second directions and rotatably mounted on the frame (4). The first roller (601) protrudes outward relative to the side of the frame (4) away from the support (1) to act on the outer peripheral surface of the first roller (601) when the telescopic arm extends and retracts along the second direction.

3. The telescopic arm code detection device according to claim 2, characterized in that, The guide structure further includes a second roller (602) arranged in parallel with the first roller (601) and rotatably mounted on the fixed frame (4), wherein the first roller (601) and the second roller (602) are arranged to be offset from each other in the first direction.

4. The telescopic arm code detection device according to claim 3, characterized in that, The mounting plate (5) located between the guide structures is mounted on the fixing frame (4). Multiple sensing units (9) are mounted on the mounting plate (5). The surface of the mounting plate (5) facing away from the support (1) is perpendicular to the first direction and is further away from the support (1) along the first direction relative to the first roller (601) and the second roller (602).

5. The telescopic arm code detection device according to claim 4, characterized in that, The fixing frame (4) has a top plate (401) and a bottom plate (402) spaced apart from each other in the third direction, and a first side plate (403) and a second side plate (404) connected between the top plate (401) and the bottom plate (402) and spaced apart from each other in the second direction on the side facing the support (1). The first side plate (403) and the second side plate (404) are respectively connected to the support (1) by the pin (2) and the spring (3) sleeved on the corresponding pin (2).

6. The telescopic arm code detection device according to claim 5, characterized in that, The top plate (401) and the bottom plate (402) each have an inclined guide surface (405) facing away from the support (1) at both ends along the second direction, and a plane (406) extending along the second direction is between the inclined guide surfaces (405). The guide structure is installed on the top plate (401) and the bottom plate (402) at positions corresponding to the inclined guide surfaces (405), and the mounting plate (5) is installed on the top plate (401) and the bottom plate (402) at positions corresponding to the plane (406).

7. The telescopic arm code detection device according to claim 4, characterized in that, The first roller (601), the second roller (602) and the mounting plate (5) are respectively made of nylon.

8. The telescopic arm code detection device according to claim 1, characterized in that, A sliding sleeve (8) is provided in the through hole on the fixing frame (4) for the pin (2) to be inserted, and the pin (2) is slidably connected in the sliding sleeve (8).

9. A telescopic arm, characterized in that, It includes a boom body having multiple telescopic arms, an arm code block (7) disposed on the telescopic arms, and a telescopic arm code detection device according to any one of claims 1 to 8.

10. An engineering machinery, characterized in that, Includes the telescopic arm according to claim 9.

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