A rock breaking device

Abstract

The rock breaking device, counterweights are arranged on both sides of the small arm, the counterweight comprises a counterweight main body and a connecting portion, two counterweight main bodies are arranged above the connecting portion, the two counterweight main bodies are respectively located on both sides of the small arm, the lower portion of the connecting portion is hinged to the second hinge point of the rock breaker, and the upper portion of the connecting portion is hinged to the third hinge point of the rock breaking cylinder; the small portion is provided with a first abutting portion, the first abutting portion has a convex portion or a concave portion; the connecting portion is provided with a second abutting portion, the second abutting portion has a convex portion or a concave portion; and the first abutting portion is clamped with the second abutting portion in the rock breaker cylinder recovery process.

Description

Technical Field

[0001] Excavator attachments, particularly a rock-breaking device that cuts through rock formations using a rock breaker. Background Technology

[0002] In the prior art, the rock-breaking device mounted on the main body of an excavator includes a boom, a forearm, and a rock breaker; one end of the boom is hinged to the upper body, and the other end is hinged to the forearm; one end of the lifting cylinder is hinged to the boom, and the other end is hinged to the upper body; one end of the forearm cylinder is hinged to the boom, and the other end is hinged to the forearm; the rock breaker is hinged to the forearm, and the rock breaker cylinder is directly or indirectly connected to the rock breaker, and the rock breaker cylinder is connected to the forearm; the counterweight is directly or indirectly connected to the rock breaker to improve the rock-breaking effect.

[0003] In the design of CN215166000U, when disassembling and assembling the ripper, the distance between the center of gravity of the counterweight and the upper hinge forms a power arm, and the upper hinge and the lower hinge form a resistance arm. The rotational force of the counterweight around the upper hinge acts on the lower hinge. When it is necessary to disassemble and assemble the ripper, this rotational force needs to be overcome so that the lower hinge can cooperate with the second mounting part to achieve disassembly and assembly; making disassembly and assembly very difficult.

[0004] In the scheme disclosed in CN216515830U, if the counterweight is hinged to the rock breaker, the hinge point will be difficult to locate during installation due to the uncertainty of the longitudinal distance between the rock breaker and the forearm after the rock breaker is removed, or the counterweight may need to be removed because of this difficulty. If the counterweight is hinged to the intermediate connecting piece, and the intermediate connecting piece is hinged to the rock breaker, then the second connecting rod must be included. In this case, if the hinge point of the intermediate connecting piece is not on the same axis in the transverse direction as the hinge point between the rock breaker cylinder and the intermediate connecting piece, the weight of the counterweight will form a rotational force around the connection point between the intermediate connecting piece and the rock breaker, which will require overcoming this rotational force when disassembling and assembling the rock breaker, making the disassembly and assembly of the rock breaker difficult. Utility Model Content

[0005] To overcome the above technical problems, the rock-breaking device of this utility model has counterweights on both sides of the forearm. The counterweights include counterweight bodies and connecting rods. Two counterweight bodies are located above the connecting rods and on both sides of the forearm. The lower part of the connecting rod is hinged to the rock-breaking device at a second hinge point, and the upper part of the connecting rod is hinged to the rock-breaking cylinder at a third hinge point. The forearm has a first abutment part with a protrusion or a recess. The connecting rod has a second abutment part with a protrusion or a recess. During the recovery of the rock-breaking cylinder, the first abutment part and the second abutment part engage. The engagement limits the longitudinal distance of the second hinge point relative to the forearm, and the contact between the first abutment part and the second abutment part limits the vertical position of the second hinge point. The second hinge point is not easily affected by the weight of the counterweights, making the rock-breaking device easy to assemble and disassemble.

[0006] This utility model is implemented as follows: A rock-breaking device is mounted on the body of an excavator, the body of which has an upper body and a lower body, the upper body being rotatably connected to the lower body; It includes a forearm and a rock breaker; the rock breaker is hinged to the forearm at the first hinge point; The forearm is equipped with a guide component, and the counterweight is in cooperation with the guide component to roll or slide. One end of the rock-breaking cylinder is hinged to the forearm at the fourth hinge point, and the other end of the rock-breaking cylinder is hinged to the counterweight at the third hinge point. The counterweight includes a counterweight body and a connecting rod. Two counterweight bodies are positioned above the connecting rod and are fixedly connected to it. The two counterweight bodies are located on both sides of the forearm. The lower part of the connecting rod is hinged to the rock breaker at the second hinge point via a third connecting shaft, and the upper part of the connecting rod is hinged to the rock breaker cylinder at the third hinge point. The forearm is provided with a first abutment part, which has a protrusion or a recess. The connecting rod is provided with a second abutment part, which also has a protrusion or a recess. During the recovery process of the rock breaker cylinder, the first abutment part can engage with the second abutment part, thus restricting the position of the first abutment part relative to the second abutment part in the longitudinal direction.

[0007] Preferably, the first abutment portion is detachably connected to the forearm.

[0008] Preferably, the rock breaker cylinder and the connecting rod are connected by a first connecting shaft, and the second abutment part is located on both sides of the third hinge point. The second abutment part is located on both sides of the first connecting shaft.

[0009] Preferably, the second abutment portion is detachably connected to the connecting rod.

[0010] Preferably, a limiter is provided between the first abutting part and the second abutting part, with one end of the limiter cooperating with the first abutting part and the other end of the limiter cooperating with the second abutting part.

[0011] Preferably, the forearm includes a front, a side, and a rear, with the two sides arranged opposite each other and the front and rear arranged opposite each other, the rock breaker cylinder located in front of the front, and the guide assembly located in front of the front; The counterweight body is fixedly connected to the connecting rod. The axis of the guide assembly is arranged laterally with the axis of the third connecting shaft, and they form line A after connection. The axis of the rock breaker cylinder is line B. When the guide assembly is located in front, the acute angle formed by line A and line B in the longitudinal direction is less than 10°.

[0012] Preferably, the forearm is connected to the rock breaker cylinder via a second connecting shaft, and the guide assembly is connected to both ends of the second connecting shaft.

[0013] The beneficial effects of this utility model are as follows: The rock-breaking device of this utility model has counterweights on both sides of the forearm. The counterweights include counterweight bodies and connecting rods. Two counterweight bodies are located above the connecting rods and on both sides of the forearm. The lower part of the connecting rod is hinged to the rock-breaking device at a second hinge point, and the upper part of the connecting rod is hinged to the rock-breaking cylinder at a third hinge point. The forearm has a first abutment part with a protrusion or a recess. The connecting rod has a second abutment part with a protrusion or a recess. During the recovery of the rock-breaking cylinder, the first abutment part and the second abutment part engage. The engagement limits the longitudinal distance of the second hinge point relative to the forearm, and the contact between the first abutment part and the second abutment part limits the vertical position of the second hinge point. The second hinge point is less affected by the weight of the counterweights, making the rock-breaking device easy to assemble and disassemble. In addition, the guide components are located at the front and at the sides of the forearm, which significantly reduces the longitudinal force of the rock-breaking cylinder on the counterweights. The counterweights are less likely to be damaged and it is beneficial to increase the thrust of the rock-breaking cylinder on the rock-breaking device. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the rock-breaking device mounted on the main body of the excavator; Figure 2 yes Figure 1 Another structural diagram; Figure 3 yes Figure 2 A partial structural diagram; Figure 4 This is a diagram of the counterweight structure; Figure 5 It is a partial structural diagram with the counterweight removed; Figure 6 It is a structural diagram with one of the counterweights removed; Figure 7 yes Figure 6 The front view; Figure 8 This is a partial structural diagram of a rock-breaking device with a limiter.

[0015] Figure label: Excavator body, 3-boom, 4-arm, 41-side, 42-front, 43-rear, 5-rock breaker, 6-counterweight, 61-counterweight body, 611-groove, 6111-opening, 612-mounting hole, 62-connecting rod, 7-rock breaker cylinder, 8-guide assembly, 81-roller. 9-Roller shaft, 10-Lifting cylinder, 11-First hinge point, 12-Second hinge point, 13-Third hinge point, 14-Fourth hinge point, 15-First abutment part, 16-Second abutment part, 17-First connecting shaft, 18-Second connecting shaft, 19-Third connecting shaft, 22-Limiter. Detailed Implementation

[0016] To aid in understanding this utility model, the relevant locations are defined as follows: Reference Figure 1 The forearm 4 is located in front of the upper arm 3, and the front-to-back direction is also longitudinal. The counterweight 6 is located above the rock breaker 5.

[0017] Reference Figure 2 The two counterweights 61 are positioned horizontally relative to each other.

[0018] A hinge point is a connection point between two or more components, including a connecting shaft and a hole that mates with the connecting shaft. Example

[0019] Reference Figure 1 and Figure 2 A rock-breaking device is mounted on the body 2 of an excavator. The body 2 of the excavator has an upper body and a lower body, with the upper body rotatably connected to the lower body.

[0020] It includes a boom 3, a forearm 4, and a rock breaker 5; one end of the boom 3 is hinged to the upper body, and the other end of the boom 3 is hinged to the forearm 4; one end of the lifting cylinder 10 is hinged to the boom 3, and the other end of the lifting cylinder 10 is hinged to the upper body; one end of the forearm cylinder 9 is hinged to the boom 3, and the other end of the forearm cylinder 9 is hinged to the forearm 4; the rock breaker 5 is hinged to the forearm 4 at the first hinge point 11.

[0021] One end of the rock-breaking cylinder 7 is hinged to the forearm 4 at the fourth hinge point 14, and the other end of the rock-breaking cylinder is hinged to the counterweight 6 at the third hinge point 13.

[0022] Reference Figure 5 The forearm 4 is equipped with a guide assembly 8, which includes a roller 81 and a roller shaft 82. The roller shaft 82 is connected to the forearm 4, and the roller 81 and the roller shaft 82 are rotated together. The counterweight 6 is rolled together with the roller 81.

[0023] In other embodiments, the guide component 8 is a shaft without rollers 81, and the shaft and the counterweight 6 form a sliding fit. However, in this way, the contact part between the counterweight 6 and the shaft is prone to wear.

[0024] Reference Figure 2 The counterweight body 61 has a horizontal mounting hole 612 for easy disassembly and assembly of the first connecting shaft 17; the surface of the counterweight body 61 facing the forearm 4 has a groove 611, and the upper part of the groove 611 has an opening 6111, which facilitates the insertion of the counterweight body 61 guide into the guide assembly 8 from the opening when the counterweight 6 is disassembled or assembled.

[0025] Reference Figure 4The counterweight 6 includes a counterweight body 61 and a connecting rod 62. The two counterweight bodies 61 are located above the connecting rod 62. The lower part of the counterweight body 61 is fixed to the upper two sides of the connecting rod 62 with bolts. A third hinge point 13 is provided at the middle position of the upper part of the connecting rod 62. There is an ear plate on each side of the third hinge point 13 for cooperating with the first connecting shaft. The lower end of the connecting rod 62 has a second hinge point 12.

[0026] Two counterweight bodies 61 are located on both sides of the forearm 4. The lower part of the connecting rod 62 is hinged to the rock breaker 5 at the second hinge point 12, and the upper part of the connecting rod 62 is hinged to the rock breaker cylinder 7 at the third hinge point 13.

[0027] Reference Figure 3 and Figure 5 The forearm 4 is provided with a first abutting part 15, which is connected to the forearm 4 by bolts. The first abutting part 15 has a circular recess.

[0028] Reference Figure 3 The connecting rod 62 is provided with a second abutment part 16; Figure 3 Inside, the second abutment part 16 is the first connecting shaft 17, which is cylindrical and arranged laterally.

[0029] The first abutment portion 15 and the second abutment portion 16 can also be configured in this way, see reference. Figure 8 The first abutting part 15 is integrally formed with the forearm and is a circular concave part; the second abutting part 16 is fixed to the connecting body 62 with bolts and has a circular convex part.

[0030] Figure 3 The second contact part 16 inside is set in a way that is relative to Figure 8 The second abutment part 16 is set up in a simpler way, without the need to separately manufacture the second abutment part 16 or separately install the second abutment part 16.

[0031] During the recovery process of the rock-breaking cylinder 7, the first abutment part 15 can engage with the second abutment part 16.

[0032] In other embodiments, a protrusion may be provided in the first abutting portion 15 and a recess may be provided in the second abutting portion 16.

[0033] Regarding the shape of the convex and concave parts, they can be conical.

[0034] When the first abutting part 15 and the second abutting part 16 are fully engaged, the position of the first hinge point 11 relative to the third hinge point 13 in the vertical and horizontal directions and the front-back direction can be restricted.

[0035] When the rock breaker needs to be removed, the rock breaker cylinder 7 is retrieved until the first abutment part 15 and the second abutment part 16 are fully abutted, and then the rock breaker 5 can be removed. After the rock breaker 5 is removed, the guide assembly 8 forms a fulcrum for the counterweight 6, which is called fulcrum one; the first abutment part 15 and the second abutment part 16 form a fulcrum, which is called fulcrum two. Fulcrum two restricts the position of the counterweight 6 relative to the first hinge point 11 in the vertical, front-back, and lateral directions. Since the positional relationship between the second hinge point 12 and the counterweight 6 is fixed, the positional relationship between the first hinge point 11 and the second hinge point 12 will not change after the rock breaker 5 is removed, and it can maintain the position that matches the rock breaker 5 with the first hinge point 11 and the second hinge point 12. During manufacturing and installation, it should be noted that when the first abutment part 15 and the second abutment part 16 are fully abutted, the distance between the first hinge point 11 and the second hinge point 12 should be consistent with the distance between the two connecting holes of the rock breaker 5.

[0036] When installing the rock breaker 5, since the first hinge point 11 and the second hinge point 12 are in a matching position, it is not necessary to overcome the rotational force of the counterweight 6 during installation, making the installation easy.

[0037] The first abutment part 15 is bolted to the forearm 4, or the second abutment part 16 is bolted to the connecting rod. The advantage is that, due to manufacturing errors, when the first abutment part 15 and the second abutment part 16 are fully abutted, the distance between the first hinge point 11 and the second hinge point 12 may not be consistent with the distance between the two connecting holes of the rock breaker 5. This is mainly due to the unsuitable position of the first abutment part 15 relative to the forearm 4 or the second abutment part 16 relative to the connecting rod 62 in the front-back direction. In this case, the bolt hole of the first abutment part 15 or the second abutment part 16 is set to be elongated. During installation, the problem can be solved by adjusting the front-back position of the first abutment part 15 relative to the forearm 4 or the second abutment part relative to the connecting rod 62.

[0038] In other embodiments, the first abutment portion 15 or the second abutment portion 16 is connected by a pin. By providing multiple pin holes, the lateral position of the first abutment portion 15 relative to the forearm or the second abutment portion 16 relative to the connecting rod 62 can also be adjusted. However, compared with the bolt connection, its adjustment effect is relatively poor.

[0039] Reference Figure 8 A limiter 22 is provided between the first abutting part 15 and the second abutting part 16. One end of the limiter 22 is connected to the first abutting part 15, and the other end of the limiter 22 is connected to the second abutting part 16.

[0040] The limiter 22 includes a U-shaped structural member and a shaft. The upper part of the U-shaped structural member is connected to the forearm via the shaft, and the lower part of the U-shaped structural member is connected to the two abutment members 16.

[0041] The limiter 22 can also be configured as a strip-shaped plate structure, with its two ends connected to the forearm 4 and the connecting rod 62 by bolts respectively; there are many ways to configure the limiter 22, which will not be described one by one here.

[0042] The advantage of this structure is that the rock breaker cylinder 7 may experience pressure leakage, causing the first abutment part 15 to accidentally separate from the second abutment part 16 after the rock breaker 5 is removed. This results in an uncertain change in the positional relationship between the second hinge point 12 and the first hinge point 11. The limiter 22 restricts the first abutment part 15 and the second abutment part 16 in the vertical direction. Utilizing their interlocking relationship, the first abutment part 15 and the second abutment part 16 will not separate. The limiter 22 is only used when the rock breaker 5 needs to be disassembled and assembled. After the rock breaker 5 is installed, it needs to be removed to avoid affecting normal operation.

[0043] Reference Figure 6 and Figure 7 The forearm 4 includes a front 42, a side 41, and a rear 43. The two side 41s are arranged opposite each other, and the front 42 and the rear 43 are arranged opposite each other. The rock breaker cylinder 5 is located in front of the front 42, and the guide assembly 8 is located in front of the front 42.

[0044] Figure 7 This is a front view, combined with... Figure 2 The axis of roller shaft 82 is arranged laterally with the axis of third connecting shaft 19, forming line A after connection. The axis of roller shaft 82 is also the axis of guide assembly 8. The axis of second connecting shaft 18 is arranged laterally, forming line B after connection with first connecting shaft 17. Line B is also the axis of rock breaker cylinder 7. After rock breaker 5 contacts the rock layer, rock breaker cylinder 7 transmits thrust to third hinge point 13, which pushes rock breaker 5 to cut and break the rock layer through connecting rod 62. When rock breaker cylinder 7 transmits thrust to second hinge point 12, its thrust direction is along line B towards second hinge point 12. During the pushing process, line B rotates around the second connecting shaft 18; the roller shaft 82 and the second hinge point 12 are the two force support points of the counterweight 6. The greater the force acting on line A in the vertical direction, the greater the possibility of the counterweight being damaged. When the thrust of the rock-breaking cylinder 7 remains unchanged, and when line A and line B form an angle in the longitudinal direction, the thrust of the rock-breaking cylinder 7 is decomposed into the force acting on the counterweight and the force acting on the second hinge point. The smaller the angle between line A and line B, the less the decomposed force of the rock-breaking cylinder 7 acting on line A in the vertical direction, and the more the force acting on the second hinge point 12.

[0045] Figure 7 In the diagram, the acute angle between line A and line B is 4.6°.

[0046] Ideally, the acute angle between line A and line B should be less than 10°.

[0047] During manufacturing, from the frontal view, the second hinge point 12, the third hinge point 13, and the fourth hinge point 14 should be aligned as much as possible to reduce the longitudinal decomposition force of the rock-breaking cylinder 7 on the counterweight 6.

[0048] Therefore, compared to placing the guide component 8 on the side 41, placing the guide component 8 in front of the front 42 makes the counterweight 6 less susceptible to damage and also helps to improve the breaking capacity of the rock breaker 5.

[0049] Reference Figure 5 In another embodiment, the forearm 4 is connected to the rock breaker cylinder 7 via a second connecting shaft 18. The guide assembly 8 includes rollers 81 but does not have roller shafts 82. The two rollers 81 are respectively connected to the two ends of the second connecting shaft 18.

[0050] In this embodiment, when the first abutting part 15 and the second abutting part 16 engage, the rock breaker is easy to disassemble and assemble; the guide component 8 is located in front of the front 42, which makes the counterweight 6 less prone to damage and deformation, and also improves the cutting ability of the rock breaker 5; thereby significantly improving the operating efficiency and reliability of the rock breaking device as well as the convenience of use and maintenance. Example

[0051] Reference Figure 1 and Figure 2 A rock-breaking device is mounted on the body 2 of an excavator. The body 2 of the excavator has an upper body and a lower body, with the upper body rotatably connected to the lower body. It includes a boom 3, a forearm 4, and a rock breaker 5; one end of the boom 3 is hinged to the upper body, and the other end of the boom 3 is hinged to the forearm 4; one end of the lifting cylinder 10 is hinged to the boom 3, and the other end of the lifting cylinder 10 is hinged to the upper body; one end of the forearm cylinder 9 is hinged to the boom 3, and the other end of the forearm cylinder 9 is hinged to the forearm 4; the rock breaker 5 is hinged to the forearm 4 at the first hinge point 11. Reference Figure 5 The forearm 4 is equipped with a guide assembly 8, which includes a roller 81 and a roller shaft 82. The roller shaft 82 is connected to the forearm 4, and the roller 81 and the roller shaft 82 are rotated together. The counterweight 6 is rolled together with the roller 81.

[0052] In other embodiments, the guide component 8 is a shaft without rollers 81, and the shaft and the counterweight 6 form a sliding fit. However, in this way, the contact part between the counterweight 6 and the shaft is prone to wear.

[0053] The counterweight 6 includes a counterweight body 61 and a connecting rod 62. The two counterweight bodies 61 are disposed above the connecting rod 62. The lower part of the counterweight body 61 is integrally disposed with the connecting rod 62. A third hinge point 13 is disposed at the middle position of the upper part of the connecting rod 62. There is an ear plate on each side of the third hinge point 13 for cooperating with the first connecting shaft. The lower end of the connecting rod 62 has a second hinge point 12.

[0054] Two counterweight bodies 61 are located on both sides of the forearm 4. The lower part of the connecting rod 62 is hinged to the rock breaker 5 at the second hinge point 12, and the upper part of the connecting rod 62 is hinged to the rock breaker cylinder 7 at the third hinge point 13.

[0055] Reference Figure 3 and Figure 5 The forearm 4 is provided with a first abutting part 15, which is connected to the forearm 4 by bolts. The first abutting part 15 has a circular recess.

[0056] Reference Figure 3 The connecting rod 62 is provided with a second abutment part 16; Figure 3 Inside, the second abutment part 16 is the first connecting shaft 17, which is cylindrical and arranged laterally.

[0057] The first abutment portion 15 and the second abutment portion 16 can also be configured in this way, see reference. Figure 8 The first abutting part 15 is integrally formed with the forearm and is a circular concave part; the second abutting part 16 is fixed to the connecting body 62 with bolts and has a circular convex part.

[0058] Figure 3 The second contact part 16 inside is set in a way that is relative to Figure 8 The second abutment part 16 is set up in a simpler way, without the need to separately manufacture the second abutment part 16 or separately install the second abutment part 16.

[0059] During the recovery process of the rock-breaking cylinder 7, the first abutment part 15 and the second abutment part 16 engage.

[0060] In other embodiments, a protrusion may be provided in the first abutting portion 15 and a recess may be provided in the second abutting portion 16.

[0061] Regarding the shape of the convex and concave parts, they can be conical.

[0062] When the first abutting part 15 and the second abutting part 16 are fully engaged, the position of the first hinge point 11 relative to the third hinge point 13 in the vertical and horizontal directions and the front-back direction can be restricted.

[0063] When the rock breaker needs to be removed, the rock breaker cylinder 7 is retrieved until the first abutment part 15 and the second abutment part 16 are fully abutted, and then the rock breaker 5 can be removed. After the rock breaker 5 is removed, the guide assembly 8 forms a fulcrum for the counterweight 6, which is called fulcrum one; the first abutment part 15 and the second abutment part 16 form a fulcrum, which is called fulcrum two. Fulcrum two restricts the position of the counterweight 6 relative to the first hinge point 11 in the vertical, front-back, and lateral directions. Since the positional relationship between the second hinge point 12 and the counterweight 6 is fixed, the positional relationship between the first hinge point 11 and the second hinge point 12 will not change after the rock breaker 5 is removed, and it can maintain the position that matches the rock breaker 5 with the first hinge point 11 and the second hinge point 12. During manufacturing and installation, it should be noted that when the first abutment part 15 and the second abutment part 16 are fully abutted, the distance between the first hinge point 11 and the second hinge point 12 should be consistent with the distance between the two connecting holes of the rock breaker 5.

[0064] When installing the rock breaker 5, since the first hinge point 11 and the second hinge point 12 are in a matching position, it is not necessary to overcome the rotational force of the counterweight 6 during installation, making the installation easy.

[0065] The first abutment part 15 is bolted to the forearm 4, or the second abutment part 16 is bolted to the connecting rod. The advantage is that, due to manufacturing errors, when the first abutment part 15 and the second abutment part 16 are fully abutted, the distance between the first hinge point 11 and the second hinge point 12 may not be consistent with the distance between the two connecting holes of the rock breaker 5. This is mainly due to the unsuitable position of the first abutment part 15 relative to the forearm 4 or the second abutment part 16 relative to the connecting rod 62 in the front-back direction. In this case, the bolt hole of the first abutment part 15 or the second abutment part 16 is set to be elongated. During installation, the problem can be solved by adjusting the front-back position of the first abutment part 15 relative to the forearm 4 or the second abutment part relative to the connecting rod 62.

[0066] In other embodiments, the first abutment portion 15 or the second abutment portion 16 is connected by a pin. By providing multiple pin holes, the lateral position of the first abutment portion 15 relative to the forearm or the second abutment portion 16 relative to the connecting rod 62 can also be adjusted. However, compared with the bolt connection, its adjustment effect is relatively poor.

[0067] Reference Figure 8 A limiter 22 is provided between the first abutting part 15 and the second abutting part 16. One end of the limiter 22 is connected to the first abutting part 15, and the other end of the limiter 22 is connected to the second abutting part 16.

[0068] The limiter 22 includes a U-shaped structural member and a shaft. The upper part of the U-shaped structural member is connected to the forearm via the shaft, and the lower part of the U-shaped structural member is connected to the two abutment members 16.

[0069] The limiter 22 can also be configured as a strip-shaped plate structure, with its two ends connected to the forearm 4 and the connecting rod 62 by bolts respectively; there are many ways to configure the limiter 22, which will not be described one by one here.

[0070] The advantage of this structure is that the rock breaker cylinder 7 may experience pressure leakage, causing the first abutment part 15 to accidentally separate from the second abutment part 16 after the rock breaker 5 is removed. This results in an uncertain change in the positional relationship between the second hinge point 12 and the first hinge point 11. The limiter 22 restricts the first abutment part 15 and the second abutment part 16 in the vertical direction. Utilizing their interlocking relationship, the first abutment part 15 and the second abutment part 16 will not separate. The limiter 22 is only used when the rock breaker 5 needs to be disassembled and assembled. After the rock breaker 5 is installed, it needs to be removed to avoid affecting normal operation.

[0071] Reference Figure 5 The forearm 4 is connected to the rock breaker cylinder 7 via the second connecting shaft 18. The guide assembly 8 includes rollers 81 but does not have roller shafts 82. The two rollers 81 are respectively connected to the two ends of the second connecting shaft 18.

[0072] Analysis reveals that in this embodiment, line A and line B can completely overlap in the longitudinal direction, and the rock breaker cylinder 7 cannot generate a disintegrating force on the counterweight 6. Compared with embodiment 1, the counterweight 6 is less prone to damage and is beneficial to improving the operating efficiency of the rock breaker 5.

[0073] In this embodiment, when the first abutting part 15 and the second abutting part 16 engage, the rock breaker is easy to disassemble and assemble; the two rollers 81 are respectively connected to both ends of the second connecting shaft 18, which further improves the reliability of the counterweight 6 and also improves the cutting ability of the rock breaker 5; thereby significantly improving the operating efficiency and reliability of the rock breaking device as well as the convenience of use and maintenance. Example

[0074] Reference Figure 1 and Figure 2 A rock-breaking device is mounted on the body 2 of an excavator. The body 2 of the excavator has an upper body and a lower body, with the upper body rotatably connected to the lower body.

[0075] It includes a boom 3, a forearm 4, and a rock breaker 5; one end of the boom 3 is hinged to the upper body, and the other end of the boom 3 is hinged to the forearm 4; one end of the lifting cylinder 10 is hinged to the boom 3, and the other end of the lifting cylinder 10 is hinged to the upper body; one end of the forearm cylinder 9 is hinged to the boom 3, and the other end of the forearm cylinder 9 is hinged to the forearm 4; the rock breaker 5 is hinged to the forearm 4 at the first hinge point 11.

[0076] Reference Figure 5The forearm 4 is equipped with a guide assembly 8, which includes a roller 81 and a roller shaft 82. The roller shaft 82 is connected to the forearm 4, and the roller 81 and the roller shaft 82 are rotated together. The counterweight 6 is rolled together with the roller 81.

[0077] In other embodiments, the guide component 8 is a shaft without rollers 81, and the shaft and the counterweight 6 form a sliding fit. However, in this way, the contact part between the counterweight 6 and the shaft is prone to wear.

[0078] The counterweight 6 includes a counterweight body 61 and a connecting rod 62. The two counterweight bodies 61 are disposed above the connecting rod 62. The lower part of the counterweight body 61 is integrally disposed with the connecting rod 62. A third hinge point 13 is disposed at the middle position of the upper part of the connecting rod 62. There is an ear plate on each side of the third hinge point 13 for cooperating with the first connecting shaft. The lower end of the connecting rod 62 has a second hinge point 12.

[0079] Two counterweight bodies 61 are located on both sides of the forearm 4. The lower part of the connecting rod 62 is hinged to the rock breaker 5 at the second hinge point 12, and the upper part of the connecting rod 62 is hinged to the rock breaker cylinder 7 at the third hinge point 13. The other end of the rock breaker cylinder 7 is hinged to the forearm 4 at the fourth hinge point 14.

[0080] Reference Figure 3 and Figure 5 The forearm 4 is provided with a first abutting part 15, which is connected to the forearm 4 by bolts. The first abutting part 15 has a circular recess.

[0081] Reference Figure 3 The connecting rod 62 is provided with a second abutment part 16; Figure 3 Inside, the second abutment part 16 is the first connecting shaft 17, which is cylindrical and arranged laterally.

[0082] The first abutment portion 15 and the second abutment portion 16 can also be configured in this way, see reference. Figure 8 The first abutting part 15 is integrally formed with the forearm and is a circular concave part; the second abutting part 16 is fixed to the connecting body 62 with bolts and has a circular convex part.

[0083] Figure 3 The second contact part 16 inside is set in a way that is relative to Figure 8 The second abutment part 16 is set up in a simpler way, without the need to separately manufacture the second abutment part 16 or separately install the second abutment part 16.

[0084] During the recovery process of the rock-breaking cylinder 7, the first abutment part 15 and the second abutment part 16 engage.

[0085] In other embodiments, a protrusion may be provided in the first abutting portion 15 and a recess may be provided in the second abutting portion 16.

[0086] Regarding the shape of the convex and concave parts, they can be conical.

[0087] When the first abutting part 15 and the second abutting part 16 are fully engaged, the position of the first hinge point 11 relative to the third hinge point 13 in the vertical and horizontal directions and the front-back direction can be restricted.

[0088] When the rock breaker needs to be removed, the rock breaker cylinder 7 is retrieved until the first abutment part 15 and the second abutment part 16 are fully abutted, and then the rock breaker 5 can be removed. After the rock breaker 5 is removed, the guide assembly 8 forms a fulcrum for the counterweight 6, which is called fulcrum one; the first abutment part 15 and the second abutment part 16 form a fulcrum, which is called fulcrum two. Fulcrum two restricts the position of the counterweight 6 relative to the first hinge point 11 in the vertical, front-back, and lateral directions. Since the positional relationship between the second hinge point 12 and the counterweight 6 is fixed, the positional relationship between the first hinge point 11 and the second hinge point 12 will not change after the rock breaker 5 is removed, and it can maintain the position that matches the rock breaker 5 with the first hinge point 11 and the second hinge point 12. During manufacturing and installation, it should be noted that when the first abutment part 15 and the second abutment part 16 are fully abutted, the distance between the first hinge point 11 and the second hinge point 12 should be consistent with the distance between the two connecting holes of the rock breaker 5.

[0089] When installing the rock breaker 5, since the first hinge point 11 and the second hinge point 12 are in a matching position, it is not necessary to overcome the rotational force of the counterweight 6 during installation, making the installation easy.

[0090] The first abutment part 15 is bolted to the forearm 4, or the second abutment part 16 is bolted to the connecting rod. The advantage is that, due to manufacturing errors, when the first abutment part 15 and the second abutment part 16 are fully abutted, the distance between the first hinge point 11 and the second hinge point 12 may not be consistent with the distance between the two connecting holes of the rock breaker 5. This is mainly due to the unsuitable position of the first abutment part 15 relative to the forearm 4 or the second abutment part 16 relative to the connecting rod 62 in the front-back direction. In this case, the bolt hole of the first abutment part 15 or the second abutment part 16 is set to be elongated. During installation, the problem can be solved by adjusting the front-back position of the first abutment part 15 relative to the forearm 4 or the second abutment part relative to the connecting rod 62.

[0091] In other embodiments, the first abutment portion 15 or the second abutment portion 16 is connected by a pin. By providing multiple pin holes, the lateral position of the first abutment portion 15 relative to the forearm or the second abutment portion 16 relative to the connecting rod 62 can also be adjusted. However, compared with the bolt connection, its adjustment effect is relatively poor.

[0092] In other embodiments, the first abutting part 15 or the second abutting part 16 may also be laterally sleeved on the forearm 4 or the connecting rod 62; specifically, a limiting cavity that extends laterally through the forearm 4 or the connecting rod 62 is provided, the first abutting part 15 or the second abutting part 16 has a main body that cooperates with the limiting cavity and a tapered part for abutting, the main body is laterally inserted into the limiting cavity, the tapered part is located outside the limiting cavity, and the tapered part is used to abut and limit the corresponding recess.

[0093] The rock-breaking cylinder 7 is located in front of the front 42.

[0094] The guide component 8 is located on the side 41. The guide component is a guide block, and the two guide blocks are fixed to both sides of the forearm with bolts. The counterweight 6 is in sliding fit with the guide block.

[0095] Compared to Embodiments 1 and 2, in this embodiment, the counterweight 6 is relatively more prone to damage and deformation, and the rock breaker 5 has relatively poor cutting ability; however, the rock breaker 5 is just as easy to assemble and disassemble. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rock-breaking device mounted on an excavator body, the excavator body having an upper body and a lower body, the upper body being rotatably connected to the lower body; It includes a forearm and a rock breaker; the rock breaker is hinged to the forearm at a first hinge point; The forearm is equipped with a guide component, and the counterweight is in rolling or sliding cooperation with the guide component. One end of the rock-breaking cylinder is hinged to the forearm at the fourth hinge point, and the other end of the rock-breaking cylinder is hinged to the counterweight at the third hinge point. Its features are, The counterweight includes a counterweight body and a connecting rod. Two counterweight bodies are disposed above the connecting rod and are fixedly connected to the connecting rod. The two counterweight bodies are respectively located on both sides of the forearm. The lower part of the connecting rod is hinged to the rock breaker at a second hinge point via a third connecting shaft, and the upper part of the connecting rod is hinged to the rock breaker cylinder at a third hinge point. The forearm is provided with a first abutment portion, which has a protrusion or a recess. The connecting rod is provided with a second abutment portion, which also has a protrusion or a recess. During the recovery process of the rock breaker cylinder, the first abutment portion can engage with the second abutment portion, thereby restricting the position of the first abutment portion relative to the second abutment portion in the longitudinal direction.

2. The rock-breaking device according to claim 1, characterized in that, The first abutment portion is detachably connected to the forearm.

3. The rock-breaking device according to claim 2, characterized in that, The rock-breaking cylinder is connected to the connecting rod via a first connecting shaft, and the second abutment is located on both sides of the third hinge point. The second abutment is located on both sides of the first connecting shaft.

4. The rock-breaking device according to claim 1, characterized in that, The second abutment portion is detachably connected to the connecting rod.

5. A rock-breaking device according to any one of claims 1-4, characterized in that, A limiter is provided between the first abutting part and the second abutting part. One end of the limiter is connected to the first abutting part, and the other end of the limiter is connected to the second abutting part.

6. A rock-breaking device according to any one of claims 1-4, characterized in that, The forearm includes a front, a side, and a rear, with the two sides arranged opposite to each other, and the front and rear arranged opposite to each other. The rock breaker cylinder is located in front of the front, and the guide assembly is located in front of the front. The counterweight body is fixedly connected to the connecting rod. The axis of the guide assembly is arranged laterally with the axis of the third connecting shaft, and they form line A after connection. The axis of the rock breaker cylinder is line B. When the guide assembly is located in front, the acute angle formed by line A and line B in the longitudinal direction is less than 10°.

7. A rock-breaking device according to claim 6, characterized in that, The forearm is connected to the rock breaker cylinder via a second connecting shaft, and the guide assembly is connected to both ends of the second connecting shaft.

Images