Movable arm height limiting device and operation machine

Abstract

The utility model relates to the technical field of operation machinery, and discloses a movable arm height limiting device and operation machinery. The movable arm height limiting device comprises a pair of first guide plates, and a guide groove extending in the length direction of the first guide plates is formed between the first guide plates. One end of the second guide plate is slidably located in the guide groove, one of the first guide plate and the second guide plate is suitable for being connected with the fixed end of the telescopic oil cylinder, the other one of the first guide plate and the second guide plate is suitable for being connected with the telescopic end of the telescopic oil cylinder, and the sliding direction of the second guide plate along the guide groove is consistent with the telescopic direction of the telescopic oil cylinder; and the limiting piece has an unlocking state and a limiting state, in the unlocking state, the second guide plate can slide in the guide groove, and in the limiting state, the first guide plate or the second guide plate abuts against the limiting piece and is limited to the designated position. The movable arm height limiting device provided by the utility model not only can limit the operation height of the movable arm, but also is relatively simple in structure and relatively low in production and preparation cost.

Description

Technical Field

[0001] The utility model relates to the technical field of operating machinery, in particular to a boom height limiting device and an operating machinery. Background Art

[0002] When the driver needs to operate the operating machinery to complete operations at different heights, generally, the driver will adjust the boom height of the operating machinery by controlling the telescopic cylinder on the boom of the operating machinery, so that the operating machinery can easily meet the needs of operations at different heights and improve the flexibility and adaptability of the operating machinery.

[0003] However, in some construction environments where there are restrictions on construction height, for example, there are high-voltage lines above the construction site. Therefore, if the boom height of the operating machinery is too high, it may come into contact with equipment or structures on the construction site, causing personal injury. Summary of the invention

[0004] In view of this, the utility model provides a boom height limiting device and an operating machine to solve the problem that the existing operating machine cannot limit the operating height range of the boom.

[0005] In a first aspect, the utility model provides a boom height limiting device, a telescopic oil cylinder is provided under the boom, and the boom height limiting device comprises:

[0006] A pair of first guide plates, wherein a guide groove extending along the length direction of the first guide plates is formed between the pair of first guide plates;

[0007] A second guide plate, one end of which is slidably located in the guide groove, one of the first guide plate and the second guide plate is suitable for connecting with the fixed end of the telescopic oil cylinder, and the other is suitable for connecting with the telescopic end of the telescopic oil cylinder, and the sliding direction of the second guide plate along the guide groove is consistent with the telescopic direction of the telescopic oil cylinder;

[0008] The limiting member has an unlocked state and a limited state. In the unlocked state, the second guide plate is slidable in the guide groove. In the limited state, the first guide plate or the second guide plate abuts against the limiting member and is limited to a specified position.

[0009] Beneficial effects: The utility model connects one of the first guide plate and the second guide plate to the fixed end of the telescopic cylinder, and the other to the telescopic end of the telescopic cylinder, so that the first guide plate and the second guide plate can be connected in a sliding manner under the drive of the telescopic cylinder, thereby avoiding the influence of the boom height limiting device on the normal operation of the boom and reducing the probability of safety accidents during excavator construction. In addition, the utility model uses a limiter to limit the first guide plate or the second guide plate to a specified position, that is, according to specific construction requirements, the range of motion of the boom operating height is limited. In this way, the occurrence of accidents can be effectively reduced, and the safety of the driver when driving the excavator is improved.

[0010] In an optional embodiment, the limiting member is inserted into the first guide plate and the second guide plate. In the limiting state, the first guide plate or the second guide plate abuts against the limiting member and limits the second guide plate to a specified position of the guide groove.

[0011] Beneficial effect: The utility model connects the first guide plate and the second guide plate together through a limit piece. On the one hand, the second guide plate can slide in the guide groove through the limit piece, ensuring that the boom height limiting device can move synchronously with the telescopic cylinder, reducing the influence of the boom height limiting device on the normal operation of the boom; on the other hand, the limit piece can also be used to limit the second guide plate to a specified position in the guide groove, thereby completing the limitation of the boom operating height range.

[0012] In an optional embodiment, a pair of the first guide plates are provided with multiple pairs of limiting holes that correspond to each other and are arranged at intervals, and the second guide plate is provided with strip holes along its length direction, and the limiting member is passed through one pair of the limiting holes and the strip holes. In the unlocked state, the second guide plate slides in the guide groove relative to the limiting member through the strip holes. In the limited state, the end of the strip hole abuts against the limiting member and is limited to a specified position.

[0013] Beneficial effect: The utility model allows the limit members to be inserted into different limit holes on a pair of first guide members, and then cooperate with the strip holes on the second guide plate, so that the operating height range of the boom can be adjusted simply and quickly, so that the excavator can flexibly adapt to different working environments.

[0014] In an optional embodiment, a pair of the first guide plates are provided with corresponding strip holes, and the second guide plate is provided with a plurality of spaced limiting holes, and the limiting member is passed through one of the limiting holes and a pair of the strip holes. In the unlocked state, the second guide plate slides in the guide groove relative to the strip hole through the limiting member, and in the limited state, the end of the strip hole abuts against the limiting member and is limited to a specified position.

[0015] Beneficial effect: The utility model allows the limit members to pass through different limit holes on the second guide member, and then cooperate with a pair of strip holes on the first guide plate, so that the operating height range of the boom can be adjusted simply and quickly, so that the excavator can flexibly adapt to different working environments.

[0016] In an optional embodiment, at least two of the limiting members are further included, and the two limiting members are arranged in different limiting holes. In the limiting state, the end of the strip hole abuts against one of the limiting members and is limited to a specified position.

[0017] Beneficial effect: The utility model sets two limit members, so that the relative sliding stability of the first guide plate and the second guide plate in the unlocked state can be increased, ensuring that the extension direction of the first guide plate and the second guide plate is always consistent with the extension direction of the telescopic cylinder, avoiding the first guide plate or the second guide plate from deviating from the original setting position due to its own gravity.

[0018] In an optional embodiment, a limit groove is formed at the end where the strip hole abuts against one of the limit members; a limit switch is provided on the fixed end of the telescopic cylinder, and the limit switch is located between the limit groove and the limit member suitable for abutting against the limit groove; a limit protrusion is provided at the end of the first guide plate or the second guide plate connected to the telescopic end of the telescopic cylinder away from the boom, and the limit protrusion is suitable for abutting against the limit switch.

[0019] Beneficial effect: The utility model arranges a limit switch between the limit groove and the limit piece suitable for abutting the limit groove, so that the limit switch abuts against the limit protrusion in advance. On the one hand, it can further narrow the range of activity of the boom operating height, and on the other hand, it can reduce the number of times the limit piece abuts against the end of the strip hole, reduce the friction loss between the limit piece and the strip hole, thereby extending the service life of the first guide plate and the second guide plate.

[0020] In an optional embodiment, one of the first guide plate and the second guide plate is adapted to be rotatably connected to the fixed end of the telescopic cylinder via a first connecting shaft, and the other is adapted to be rotatably connected to the telescopic end of the telescopic cylinder via a second connecting shaft.

[0021] Beneficial effect: The utility model rotationally connects one of the first guide plate and the second guide plate to the fixed end of the telescopic cylinder through the first connecting shaft, and rotationally connects the other to the telescopic end of the telescopic cylinder through the second connecting shaft. In this way, it can not only ensure that the first guide plate and the second guide plate (boom height limiting device) are consistent with the movement trajectory of the boom, but also ensure that the extension direction of the first guide plate and the second guide plate is always consistent with the telescopic direction of the telescopic cylinder, thereby improving the stability and reliability of the boom height limiting device and ensuring that the boom of the excavator can work normally and efficiently within the limited operating height range.

[0022] In an optional embodiment, the first connecting shaft and the second connecting shaft are both provided with oppositely arranged baffle rings and baffle plates, and an installation space suitable for installing the first guide plate or the second guide plate is formed between the oppositely arranged baffle rings and baffle plates.

[0023] Beneficial effect: The utility model can prevent the first guide plate and the second guide plate from moving axially along the axis where they are located by providing a baffle ring and a baffle plate on the first connecting shaft and the second connecting shaft, thereby ensuring that the boom height limiting device can effectively play its height limiting role.

[0024] In an optional implementation, the limiting member is a pin or a bolt.

[0025] Beneficial effect: The limiting parts in the utility model, whether they are pins or bolts, are common standard parts. Therefore, when the limiting parts need to be maintained or replaced later, the maintenance cost and time can be reduced, and the maintainability of the boom height limiting device can be improved.

[0026] In a second aspect, the utility model further provides an operating machine, comprising:

[0027] Rotating platform;

[0028] A movable arm, hinged to the rotary platform;

[0029] A telescopic oil cylinder is arranged below the movable arm, a fixed end of the telescopic oil cylinder is hinged to the rotary platform, and a telescopic end of the telescopic oil cylinder is hinged to the movable arm;

[0030] In the above-mentioned boom height limiting device, one of the first guide plate and the second guide plate is connected to the fixed end of the telescopic cylinder, and the other is connected to the telescopic end of the telescopic cylinder.

[0031] Beneficial effect: The utility model connects one of the first guide plate and the second guide plate in the above-mentioned boom height limiting device to the fixed end of the telescopic cylinder, and the other is connected to the telescopic end of the telescopic cylinder. In this way, the above-mentioned boom height limiting device can be consistent with the movement trajectory of the boom. At the same time, under the drive of the telescopic cylinder, the first guide plate and the second guide plate can be slidably connected. Subsequently, through the limiting piece in the above-mentioned boom height limiting device, the first guide plate or the second guide plate is limited to the specified position to complete the adjustment of the operating height range of the boom of the operating machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the assembly of a boom height limiting device and a boom according to an embodiment of the utility model;

[0034] Figure 2 for Figure 1 The structural schematic diagram of the boom height limiting device is shown.

[0035] Description of reference numerals:

[0036] 1. Boom; 101. First connecting shaft; 2. Telescopic cylinder; 201. Fixed end; 202. Telescopic end; 203. Second connecting shaft; 3. First guide plate; 301. Guide groove; 302. Limit hole; 4. Second guide plate; 401. Strip hole; 4011. Limit groove; 5. Limit member; 6. Limit switch; 7. Limit protrusion; 8. Retaining ring; 9. Baffle. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0038] Aiming at the problem that the existing operating machinery cannot limit the movable range of the operating height of the boom, the utility model provides a boom height limiting device and an operating machinery.

[0039] Combine the following Figure 1 to Figure 2 , describing an embodiment of the utility model.

[0040] According to an embodiment of the present utility model, on the one hand, as Figure 1 and Figure 2 As shown, a boom height limiting device is provided. A telescopic cylinder 2 is provided under the boom 1. The boom height limiting device includes: a pair of first guide plates 3, a second guide plate 4 and a limiting member 5.

[0041] Specifically, a pair of first guide plates 3 form a guide groove 301 extending along the length direction thereof; one end of the second guide plate 4 is slidably located in the guide groove 301, one of the first guide plate 3 and the second guide plate 4 is suitable for being connected to the fixed end 201 of the telescopic cylinder 2, and the other is suitable for being connected to the telescopic end 202 of the telescopic cylinder 2, and the sliding direction of the second guide plate 4 along the guide groove 301 is consistent with the telescopic direction of the telescopic cylinder 2; the limiting member 5 has an unlocked state and a limited state, in the unlocked state, the second guide plate 4 is slidable in the guide groove 301, and in the limited state, the first guide plate 3 or the second guide plate 4 abuts against the limiting member 5 and is limited to a specified position.

[0042] The embodiment of the utility model connects one of the first guide plate 3 and the second guide plate 4 to the fixed end 201 of the telescopic cylinder 2, and the other to the telescopic end 202 of the telescopic cylinder 2, so that the first guide plate 3 and the second guide plate 4 can be connected in a sliding manner under the drive of the telescopic cylinder 2, thereby avoiding the influence of the boom height limiting device on the normal operation of the boom 1 and reducing the probability of safety accidents during the construction of the operating machinery. In addition, the embodiment of the utility model uses the limiter 5 to limit the first guide plate 3 or the second guide plate 4 to a specified position, that is, according to the specific construction requirements, the operating height range of the boom 1 is limited. In this way, the occurrence of accidents can be effectively reduced, and the safety of the driver when driving the operating machinery is improved.

[0043] It can be understood that, since one of the first guide plate 3 and the second guide plate 4 is connected to the fixed end 201 of the telescopic cylinder 2, and the other is connected to the telescopic end 202 of the telescopic cylinder 2, the boom height limiting device in this embodiment is located on one side of the boom 1. Preferably, the boom height limiting device is arranged on the side of the boom 1 away from the cab of the operating machine, so that on the one hand, the boom height limiting device can be prevented from interfering with the cab and affecting the normal operation of the excavator; on the other hand, since the side of the boom 1 away from the cab of the operating machine has sufficient installation space, it is convenient for the staff to install and disassemble the boom height limiting device, reducing the time and cost consumed during the installation and disassembly process. In addition, the boom height limiting device in this embodiment has a relatively simple structure, so it can also reduce its production and preparation costs.

[0044] It should be noted that, since one of the first guide plate 3 and the second guide plate 4 in this embodiment is suitable for connecting to the fixed end 201 of the telescopic cylinder 2, and the other is suitable for connecting to the telescopic end 202 of the telescopic cylinder 2, a pair of first guide plates 3 can be connected to the fixed end 201 of the telescopic cylinder 2, and the second guide plate 4 can be connected to the telescopic end 202 of the telescopic cylinder 2; or the second guide plate 4 can be connected to the fixed end 201 of the telescopic cylinder 2, and a pair of first guide plates 3 can be connected to the telescopic end 202 of the telescopic cylinder 2. This is explained below with reference to specific examples.

[0045] Example 1:

[0046] In this example, a pair of first guide plates 3 are connected to the fixed end 201 of the telescopic cylinder 2, and the second guide plate 4 is connected to the telescopic end 202 of the telescopic cylinder 2. At this time, the positions of the first guide plate 3 and the fixed end 201 of the telescopic cylinder 2 are relatively static, and the positions of the second guide plate 4 and the telescopic end 202 of the telescopic cylinder 2 are relatively static. In this way, in the unlocked state, the second guide plate 4 can slide in the guide groove 301; in the locked state, the locking member will limit the movement range of the second guide plate 4, thereby completing the adjustment of the operating height range of the operating mechanical boom 1.

[0047] Example 2:

[0048] In this example, a pair of first guide plates 3 are connected to the telescopic end 202 of the telescopic cylinder 2, and the second guide plate 4 is connected to the fixed end 201 of the telescopic cylinder 2. At this time, the positions of the first guide plate 3 and the telescopic end 202 of the telescopic cylinder 2 are relatively static, and the positions of the second guide plate 4 and the fixed end 201 of the telescopic cylinder 2 are relatively static. In this way, in the unlocked state, the first guide plate 3 slides relative to the second guide plate 4; in the locked state, the locking member will limit the movement range of the first guide plate 3, thereby completing the adjustment of the operating height range of the operating mechanical boom 1.

[0049] According to one embodiment of the utility model, the limiting member 5 is inserted into the first guide plate 3 and the second guide plate 4. In the limiting state, the first guide plate 3 or the second guide plate 4 abuts against the limiting member 5 and limits the second guide plate 4 to a specified position of the guide groove 301.

[0050] The embodiment of the utility model connects the first guide plate 3 and the second guide plate 4 together through the limit member 5. On the one hand, the second guide plate 4 can slide in the guide groove 301 through the limit member 5, ensuring that the boom height limiting device can move synchronously with the telescopic cylinder 2, thereby reducing the influence of the boom height limiting device on the normal operation of the boom 1; on the other hand, the limit member 5 can also be used to limit the second guide plate 4 to a specified position in the guide groove 301, thereby completing the limitation of the operating height range of the boom 1.

[0051] According to one embodiment of the utility model, Figure 2 As shown, a pair of first guide plates 3 are provided with multiple pairs of limiting holes 302 which correspond to each other and are arranged at intervals, and the second guide plate 4 is provided with strip holes 401 along its length direction, and the limiting member 5 is passed through one pair of limiting holes 302 and the strip holes 401. In the unlocked state, the second guide plate 4 slides in the guide groove 301 relative to the limiting member 5 through the strip holes 401, and in the limited state, the end of the strip hole 401 abuts against the limiting member 5 and is limited to a specified position.

[0052] The utility model passes the limiting member 5 through different limiting holes 302 on a pair of first guide members, and then cooperates with the strip hole 401 on the second guide plate 4, so that the operating height range of the boom 1 can be adjusted simply and quickly, so that the operating machine can flexibly adapt to different working environments.

[0053] According to an embodiment of the utility model, a pair of first guide plates 3 are provided with one-to-one corresponding strip holes 401, and the second guide plate 4 is provided with a plurality of spaced limiting holes 302. The limiting member 5 is passed through one of the limiting holes 302 and a pair of strip holes 401. In the unlocked state, the second guide plate 4 slides in the guide groove 301 relative to the strip hole 401 through the limiting member 5. In the limited state, the end of the strip hole 401 abuts against the limiting member 5 and is limited to a specified position.

[0054] The embodiment of the utility model allows the limit member 5 to pass through different limit holes 302 on the second guide member, and then cooperate with a pair of strip holes 401 on the first guide plate 3, so that the operating height range of the boom 1 can be adjusted simply and quickly, so that the operating machine can flexibly adapt to different working environments.

[0055] It should be noted that the number of the limiting holes 302 in this embodiment can be two, three or five. Specifically, the staff can adjust the number of the limiting holes 302 according to actual needs, and the present utility model does not make specific limitations on this.

[0056] According to an embodiment of the present invention, at least two limiting members 5 are further included. The two limiting members 5 are arranged in different limiting holes 302. In the limiting state, the end of the strip hole 401 abuts against one of the limiting members 5 and is limited to a specified position.

[0057] The embodiment of the utility model sets two limit members 5, so that the relative sliding stability of the first guide plate 3 and the second guide plate 4 in the unlocked state can be increased, ensuring that the extension direction of the first guide plate 3 and the second guide plate 4 is always consistent with the extension direction of the telescopic cylinder 2, thereby preventing the first guide plate 3 or the second guide plate 4 from deviating from the original setting position due to their own gravity.

[0058] According to one embodiment of the utility model, a limit groove 4011 is formed at the end where the strip hole 401 abuts against one of the limit members 5; a limit switch 6 is provided on the fixed end 201 of the telescopic cylinder 2, and the limit switch 6 is located between the limit groove 4011 and the limit member 5 suitable for abutting against the limit groove 4011; a limit protrusion 7 is provided at the end of the first guide plate 3 or the second guide plate 4 connected to the telescopic end 202 of the telescopic cylinder 2 away from the boom 1, and the limit protrusion 7 is suitable for abutting against the limit switch 6.

[0059] In the embodiment of the utility model, a limit switch 6 is arranged between the limit groove 4011 and the limit member 5 suitable for abutting against the limit groove 4011, so that the limit switch 6 abuts against the limit protrusion 7 in advance. On the one hand, it can further narrow the range of activity of the boom 1 in terms of operating height, and on the other hand, it can reduce the number of times the limit member 5 abuts against the end of the strip hole 401, thereby reducing the friction loss between the limit member 5 and the strip hole 401, thereby extending the service life of the first guide plate 3 and the second guide plate 4.

[0060] It should be noted that the limit switch 6 in this embodiment is suitable for being connected to the controller, so when the limit switch 6 abuts against the limit protrusion 7, the controller will stop the lifting of the boom 1 of the operating machine (i.e., stop the continued extension of the telescopic end 202 of the telescopic cylinder 2), so that the degree of automation of the boom height limiting device can be increased. In addition, since the limit switch 6 is arranged between the limit groove 4011 and the limit member 5 suitable for abutting against the limit groove 4011, the limit switch 6 can be abutted against the limit protrusion 7 before the limit member 5 abuts against the limit groove 4011, so as to complete the limitation of the position of the first guide plate 3 or the second guide plate 4, avoid the limit member 5 and the limit groove 4011 directly "hard collision" in the locked state, reduce the structural damage of the first guide plate 3 and the second guide plate 4, and extend the service life of the boom height limiting device.

[0061] It can be understood that when the limit switch 6 in this embodiment is in a normal working state, the limit member 5 will not abut against the limit groove 4011; and only when the limit switch 6 fails, the boom 1 will continue to rise under the action of the telescopic cylinder 2, and the limit member 5 will abut against the limit groove 4011, and then rely on the interaction force between the two to brake the boom 1, avoid the occurrence of danger, and thus protect the safety of the operating machinery and personnel.

[0062] According to one embodiment of the utility model, one of the first guide plate 3 and the second guide plate 4 is suitable for being rotatably connected to the fixed end 201 of the telescopic cylinder 2 through the first connecting shaft 101, and the other is suitable for being rotatably connected to the telescopic end 202 of the telescopic cylinder 2 through the second connecting shaft 203.

[0063] In the embodiment of the utility model, one of the first guide plate 3 and the second guide plate 4 is rotatably connected to the fixed end 201 of the telescopic cylinder 2 through the first connecting shaft 101, and the other is rotatably connected to the telescopic end 202 of the telescopic cylinder 2 through the second connecting shaft 203. In this way, it can not only ensure that the movement trajectory of the first guide plate 3 and the second guide plate 4 (boom height limiting device) is consistent with the boom 1, but also ensure that the extension direction of the first guide plate 3 and the second guide plate 4 is always consistent with the telescopic direction of the telescopic cylinder 2, thereby improving the stability and reliability of the boom height limiting device and ensuring that the boom 1 of the operating machinery can work normally and efficiently within the limited operating height range.

[0064] According to an embodiment of the utility model, the first connecting shaft 101 and the second connecting shaft 203 are both provided with oppositely disposed retaining rings 8 and retaining plates 9, and an installation space suitable for installing the first guide plate 3 or the second guide plate 4 is formed between the oppositely disposed retaining rings 8 and retaining plates 9.

[0065] The embodiment of the utility model provides a baffle ring 8 and a baffle plate 9 on the first connecting shaft 101 and the second connecting shaft 203. On the one hand, it can ensure that an avoidance space is formed between the first guide plate 3 and the second guide plate 4 and the boom 1, thereby preventing the first guide plate 3 and the second guide plate 4 from contacting the structure or equipment on the boom 1 and affecting the normal operation of the operating machinery; on the other hand, it can prevent the first guide plate 3 and the second guide plate 4 from falling off the connecting shaft, thereby ensuring that the boom height limiting device can effectively play its height limiting role.

[0066] It should be noted that, in this embodiment, the retaining rings 8 on the first connecting shaft 101 and the second connecting shaft 203 are both arranged on the side close to the boom 1 .

[0067] According to an embodiment of the present invention, the limiting member 5 is a pin or a bolt.

[0068] The position limiting member 5 in the embodiment of the utility model, whether it is a pin shaft or a bolt, is a common standard part. Therefore, when the position limiting member 5 needs to be maintained or replaced later, the maintenance cost and time can be reduced, and the maintainability of the boom height limiting device can be improved.

[0069] According to an embodiment of the present utility model, on the other hand, a working machine is provided, comprising: a slewing platform, a boom 1, a telescopic cylinder 2 and the above-mentioned boom height limiting device.

[0070] Specifically, the boom 1 is hinged to the rotating platform; the telescopic cylinder 2 is arranged below the boom 1, the fixed end 201 of the telescopic cylinder 2 is hinged to the rotating platform, and the telescopic end 202 of the telescopic cylinder 2 is hinged to the boom 1; one of the first guide plate 3 and the second guide plate 4 in the above-mentioned boom height limiting device is connected to the fixed end 201 of the telescopic cylinder 2, and the other is connected to the telescopic end 202 of the telescopic cylinder 2.

[0071] In the embodiment of the utility model, one of the first guide plate 3 and the second guide plate 4 in the above-mentioned boom height limiting device is connected to the fixed end 201 of the telescopic cylinder 2, and the other is connected to the telescopic end 202 of the telescopic cylinder 2. In this way, the above-mentioned boom height limiting device can be consistent with the movement trajectory of the boom 1. At the same time, under the drive of the telescopic cylinder 2, the first guide plate 3 and the second guide plate 4 can be slidably connected. Subsequently, the first guide plate 3 or the second guide plate 4 is limited to a specified position through the limiting member 5 in the above-mentioned boom height limiting device to complete the adjustment of the working height range of the boom 1 of the operating machine.

[0072] It can be understood that when the boom height limiting device in this embodiment is installed on the boom 1 of the operating machinery, there is no need to make major adjustments to the structure of the operating machinery itself. It is only necessary to lengthen the articulated axis between the fixed end 201 of the telescopic cylinder 2 and the rotating platform (i.e., the first connecting axis 101), and to lengthen the articulated axis between the telescopic end 202 of the telescopic cylinder 2 and the boom 1 (i.e., the second connecting axis 203). In this way, the installation and disassembly process of the boom height limiting device is simplified, and the cost of modifying the operating machinery is reduced.

[0073] It should be noted that one of the first guide plate 3 and the second guide plate 4 in this embodiment can be installed at the hinge of the fixed end of the telescopic cylinder 2 and the rotating platform, that is, the first guide plate 3 or the second guide plate 4 is sleeved on the rotating shaft connecting the fixed end of the telescopic cylinder 2 and the rotating platform. Similarly, the other end of the boom height limiting device (that is, the first guide plate 3 or the second guide plate 4 not connected to the fixed end of the telescopic cylinder 2) is sleeved on the rotating shaft connecting the telescopic end of the telescopic cylinder 2 and the boom. Such an arrangement can optimize the structure and reduce the number of connectors used.

[0074] Furthermore, the working machine in this embodiment may be, but is not limited to, an excavator.

[0075] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A boom height limiting device, wherein a telescopic cylinder (2) is provided below the boom (1), characterized in that: The boom height limiting device comprises: A pair of first guide plates (3), wherein a guide groove (301) extending along the length direction thereof is formed between the pair of first guide plates (3); A second guide plate (4), one end of which is slidably located in the guide groove (301); one of the first guide plate (3) and the second guide plate (4) is suitable for connecting to the fixed end (201) of the telescopic oil cylinder (2); the other is suitable for connecting to the telescopic end (202) of the telescopic oil cylinder (2); the sliding direction of the second guide plate (4) along the guide groove (301) is consistent with the telescopic direction of the telescopic oil cylinder (2); The limiting member (5) has an unlocked state and a limited state. In the unlocked state, the second guide plate (4) is slidable in the guide groove (301). In the limited state, the first guide plate (3) or the second guide plate (4) abuts against the limiting member (5) and is limited to a specified position.

2. The boom height limiting device according to claim 1, characterized in that: The limiting member (5) is inserted into the first guide plate (3) and the second guide plate (4); in the limiting state, the first guide plate (3) or the second guide plate (4) abuts against the limiting member (5), and the second guide plate (4) is limited to a specified position of the guide groove (301).

3. The boom height limiting device according to claim 2, characterized in that: A pair of the first guide plates (3) are provided with a plurality of pairs of limiting holes (302) which correspond to each other and are arranged at intervals, and the second guide plate (4) is provided with strip holes (401) along its length direction, and the limiting member (5) is inserted into one of the pairs of limiting holes (302) and the strip holes (401). In the unlocked state, the second guide plate (4) slides in the guide groove (301) relative to the limiting member (5) through the strip holes (401). In the limited state, the end of the strip hole (401) abuts against the limiting member (5) and is limited to a specified position.

4. The boom height limiting device according to claim 2, characterized in that: A pair of the first guide plates (3) are provided with corresponding strip holes (401), and a plurality of spaced limiting holes (302) are provided on the second guide plate (4). The limiting member (5) is inserted into one of the limiting holes (302) and the pair of the strip holes (401). In the unlocked state, the second guide plate (4) slides in the guide groove (301) relative to the strip hole (401) through the limiting member (5). In the limited state, the end of the strip hole (401) abuts against the limiting member (5) and is limited to a specified position.

5. The boom height limiting device according to claim 3 or 4, characterized in that: It also comprises at least two of the limiting members (5), the two limiting members (5) being arranged in different limiting holes (302), and in the limiting state, the end of the strip-shaped hole (401) abuts against one of the limiting members (5) and is limited to a specified position.

6. The boom height limiting device according to claim 5, characterized in that: A limiting groove (4011) is formed at the end where the strip hole (401) abuts against one of the limiting members (5); a limit switch (6) is provided on the fixed end (201) of the telescopic oil cylinder (2), and the limit switch (6) is located between the limiting groove (4011) and the limiting member (5) suitable for abutting against the limiting groove (4011); a limiting protrusion (7) is provided at one end of the first guide plate (3) or the second guide plate (4) connected to the telescopic end (202) of the telescopic oil cylinder (2) and away from the movable arm (1), and the limiting protrusion (7) is suitable for abutting against the limit switch (6).

7. The boom height limiting device according to claim 1, characterized in that: One of the first guide plate (3) and the second guide plate (4) is suitable for being rotatably connected to the fixed end (201) of the telescopic cylinder (2) through a first connecting shaft (101), and the other is suitable for being rotatably connected to the telescopic end (202) of the telescopic cylinder (2) through a second connecting shaft (203).

8. The boom height limiting device according to claim 7, characterized in that: The first connecting shaft (101) and the second connecting shaft (203) are both provided with a baffle ring (8) and a baffle plate (9) arranged opposite to each other, and an installation space suitable for installing the first guide plate (3) or the second guide plate (4) is formed between the baffle ring (8) and the baffle plate (9) arranged opposite to each other.

9. The boom height limiting device according to any one of claims 1 to 4 or 7 or 8, characterized in that: The limiting member (5) is a pin or a bolt.

10. A working machine, characterized in that: include: Rotating platform; A movable arm (1) is hinged to the rotary platform; A telescopic oil cylinder (2) is arranged below the movable arm (1), the fixed end (201) of the telescopic oil cylinder (2) is hinged to the rotating platform, and the telescopic end (202) of the telescopic oil cylinder (2) is hinged to the movable arm (1); The boom height limiting device according to any one of claims 1 to 9, wherein one of the first guide plate (3) and the second guide plate (4) is connected to the fixed end (201) of the telescopic cylinder (2), and the other is connected to the telescopic end (202) of the telescopic cylinder (2).

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