Frame for lagging jack trolley

Abstract

The frame for the lagging jack trolley comprises a frame body and an installation platform, the installation platform is arranged on the frame body, the installation platform is of a box structure, and at least one arm support installation base is arranged on the installation platform. According to the frame for the lagging jack trolley, the mounting platform is arranged on the frame body, at least one mounting surface is arranged on the mounting platform, the mounting surface can provide the mounting plane for the arm support mounting seat, so that the arm support mounting seat can be mounted on the mounting platform, and the mounting platform is arranged on the frame body; the telescopic arm is connected with the installation platform through the arm frame installation base instead of being directly connected with the frame body, due to the arrangement of the installation platform, when the frame is connected with the telescopic arm, the frame does not need to be integrally thickened, connection between the telescopic arm and the frame can be achieved only through the installation platform, and therefore the frame is small in overall size, light in weight, low in manufacturing cost and high in flexibility.

Description

Technical Field

[0001] The present application relates to the field of vehicle frame technology, and in particular to a vehicle frame for an arch trolley. Background Art

[0002] Arch trolleys are widely used in tunnel operations to install arches in tunnels. Due to the weight of the trolley and the operating environment, high structural strength requirements are placed on the trolley.

[0003] The arch trolley generally includes structures such as the power system, axle, cab, and frame. The frame mainly carries components such as the cab and power system to enable the arch trolley to travel smoothly when traveling in the tunnel.

[0004] However, the frame cross-sections of the existing arch gantry trolleys are roughly the same, the axles are installed on the front and rear sides of the frame, and the power system is installed in the middle of the frame, but when the axles rotate, they will squeeze the frame inward. Therefore, the frame cross-section width of the arch gantry trolley in the existing technology will be set smaller to avoid the axles squeezing the frame; however, the power system is large, so it requires a larger installation space. Most of the existing technologies will set an additional expansion structure on the frame to facilitate the installation of the power system, but the additional expansion structure needs to be connected to the frame through another connecting part, and is not an integrated structure, which will make the frame structure more cumbersome and bulky. In addition, the original frame structure has limited bearing capacity for the power system. After long-term use, it will accelerate the consumption of the service life of the frame, which can easily cause safety hazards of the arch gantry trolley.

[0005] In addition, when the vehicle frame in the prior art needs to be connected to the telescopic arm, the telescopic arm will be directly connected to the vehicle frame. Such a connection structure will require the structural strength of the vehicle frame to be greater, thereby making the vehicle frame thicker, larger in size and heavier. Therefore, its cost is high, and it is relatively bulky and not convenient for flexible movement.

[0006] Therefore, the frame of the arch trolley in the prior art has room for further improvement. Utility Model Content

[0007] In view of this, in order to solve the technical problem that the frame of the arch trolley in the above-mentioned prior art is directly connected to the telescopic arm, which will cause the frame to be thicker and larger in size, resulting in the frame being bulky and expensive, the present application provides a frame for an arch trolley, which has a mounting platform set on the frame body, and a mounting surface is provided on the mounting platform, which can be used to install an arm mounting seat. The telescopic arm can be connected to the frame through the arm mounting seat, and then there is no need to thicken the frame, which can save costs and avoid the frame being bulky.

[0008] The present application provides a frame for an arch trolley, comprising a frame body and a mounting platform, wherein the mounting platform is arranged on the frame body, wherein the mounting platform is a box structure, and at least one arm mounting seat is provided on the mounting platform.

[0009] Compared with the prior art, the present application provides a frame for an arch trolley, wherein a mounting platform is provided on the frame, and the mounting platform is arranged as a box structure. The box structure has multiple mounting surfaces, and the mounting surfaces can provide mounting planes for the arm mounting seat, so that the mounting platform can be equipped with at least one arm mounting seat; the mounting platform is arranged on the frame, that is, the telescopic arm is connected to the mounting platform through the arm mounting seat, rather than directly connected to the frame. The arrangement of the mounting platform makes it unnecessary to thicken the frame as a whole when connecting the telescopic arm, and the connection between the telescopic arm and the frame can be achieved only through the mounting platform, so that the overall size and weight of the frame are small, the cost is low and the flexibility is high.

[0010] Preferably, reinforcement plates are provided on both sides of the installation platform, side walls of the reinforcement plates are connected to side walls of the installation platform, and the bottom of the reinforcement plates is connected to the frame.

[0011] Preferably, reinforcing ribs are provided in the installation platform, and the reinforcing ribs are staggered and used to strengthen the structural strength of the installation platform.

[0012] Preferably, the frame includes a first beam section and a second beam section, the first beam section is connected to the second beam section, wherein the cross-sectional width of the first beam section is greater than the cross-sectional width of the second beam section.

[0013] Preferably, the first beam section is divided into a power mounting beam section and an axle mounting beam section, the power mounting beam section is connected to the axle mounting beam section, and the cross-sectional width of the power mounting beam section is greater than the cross-sectional width of the axle mounting beam section.

[0014] Preferably, one end of the power installation beam section is connected to the axle installation beam section, and the other end of the power installation beam section is connected to the second beam section;

[0015] Wherein, the cross-sectional width of the second beam section is smaller than the cross-sectional width of the axle mounting beam section.

[0016] Preferably, the first beam section is a box-type structure, and the second beam section is an I-type structure.

[0017] Preferably, it further comprises a leg seat, the leg seat comprising a horizontal extension portion and a vertical extension portion, one end of the horizontal extension portion is connected to the junction of the first beam section and the second beam section, and the vertical extension portion is connected to the other end of the horizontal extension portion;

[0018] The leg seats are used for installing fixed legs.

[0019] Preferably, it further comprises a first mounting seat, which is arranged at the end of the frame body and is used to mount the legs.

[0020] Preferably, it further includes a second mounting seat, which is arranged at the end of the frame body and is used to install a counterweight box.

[0021] The present invention provides a frame for an arch trolley, which has at least the following technical effects:

[0022] 1. A mounting platform is provided on the frame. The mounting platform is a box structure, thus having multiple mounting surfaces, which can provide a mounting plane for the boom mounting seat, so that the mounting platform can be used to mount at least one boom mounting seat. The telescopic arm is connected to the mounting platform through the boom mounting seat, that is, the telescopic arm is not directly connected to the frame, but is connected to the frame through the mounting platform, thereby eliminating the need to thicken the entire frame, which is beneficial to reducing the overall weight and cost of the frame.

[0023] 2. By setting the installation platform as a hollow structure, the weight and cost of the installation platform can be reduced; staggered reinforcement ribs are set inside the installation platform to enhance the structural strength of the installation platform and ensure the structural stability of the installation platform;

[0024] 4. By providing two beam sections with different cross-sectional widths, the different cross-sectional requirements for axle and powertrain installation can be met. When the vehicle frame turns, the axle will not easily collide or squeeze with the second beam section. The first beam section has a larger cross-sectional width, which can meet the width requirements of the powertrain. As a result, the frame does not need to be equipped with additional expansion structures to install the powertrain. The frame presents an integrated structure, which can maximize structural rigidity and strength, and the frame structure is also more stable.

[0025] 5. The second beam section is set as an I-shaped structure. The I-shaped structure has good structural strength and can be directly used as an installation base to place heavier equipment. The first beam section at the front end of the frame is set as a box-type structure, which can improve the structural torsion resistance and solve the problem of the outriggers leaving the ground. The steel plate thickness of the box-type structure is thinner, which reduces the overall weight of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of a frame for an arch trolley provided in one embodiment of the present application;

[0027] Figure 2 yes Figure 1 A magnified schematic diagram of a local area A;

[0028] Figure 3is a schematic cross-sectional structural diagram of an installation platform provided in one embodiment of the present application;

[0029] Figure 4 It is a top view schematic diagram of a frame for an arch trolley provided in one embodiment of the present application;

[0030] Figure 5 is a schematic cross-sectional structural diagram of a first beam segment provided in one embodiment of the present application;

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the second beam section provided in one embodiment of the present application.

[0032] Reference numerals: 1, frame for arch trolley;

[0033] 11. Frame; 12. Mounting platform; 13. First mounting base; 14. Second mounting base; 15. Reinforcement plate; 16. Leg base;

[0034] 111, first beam section; 112, second beam section; 1111, power installation beam section; 1112, axle installation beam section;

[0035] 121. First boom mounting seat; 122. Second boom mounting seat; 123. Reinforcement ribs; 124. Air avoidance structure;

[0036] 161. Horizontal extension; 162. Vertical extension. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail, clearly, and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.

[0038] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting this application.

[0040] The present application will be described in further detail below with reference to the accompanying drawings. Figures 1 to 6 illustrate.

[0041] The present application provides a frame for an arch trolley (hereinafter referred to as frame 1), which is used in an arch trolley or an anchor trolley, such as Figures 1 to 2 As shown, the frame 1 for the arch trolley includes a frame body 11 and a mounting platform 12, and the mounting platform 12 is arranged on the frame body 11, wherein the mounting platform 12 is arranged in the middle position of the frame body 11, and the mounting platform 12 can be connected to the frame body 11 by welding, and the mounting platform 12 protrudes upward relative to the frame body 11; in this embodiment, the mounting platform 12 is a rectangular box structure, and a plurality of mounting surfaces are provided on the mounting platform 12, and the mounting surface is a plane, and an arm mounting seat can be installed on the mounting surface, so that the mounting platform 12 can be installed with at least one arm mounting seat, and the arm mounting seat is used to connect with the telescopic arm, so that the telescopic arm can be connected to the frame 1 through the mounting platform 12, and there is no need to directly connect the telescopic arm to the frame body 11 of the frame 1, thereby avoiding increasing the thickness of the frame 1, and can make the overall weight of the frame 1 lighter, thereby reducing the cost of the frame 1 and improving the flexibility of the frame 1.

[0042] like Figure 2 As shown, in this embodiment, the mounting platform 12 provides multiple regular mounting planes. The bottom surface of the mounting platform 12 is connected to the frame 11, and the remaining five surfaces of the mounting platform 12 can be used to install boom mounting seats. In this embodiment, a first boom mounting seat 121 and a second boom mounting seat 122 are installed on the mounting platform 12. The first boom mounting seat 121 and the second boom mounting seat 122 are installed on different mounting surfaces. The first boom mounting seat 121 is installed on the front end surface of the mounting platform 12, and the second boom mounting seat 122 is installed on the upper end surface of the mounting platform 12. The first boom mounting seat 121 and the second boom mounting seat 122 can both be used to install telescopic arms. The mounting platform 12 of the present application improves the installation flexibility of the mounting platform 12 by providing mounting surfaces of different planes, and can install multiple telescopic arms, which has a good application effect. The boom mounting seat can be welded or assembled to the mounting platform 12. The setting position and number of the boom mounting seat can be selected according to actual needs. The mounting platform 12 adapts to various boom combination modes, improving the applicability of the frame 1.

[0043] Further, such as Figure 2 As shown, reinforcement plates 15 are provided on both sides of the mounting platform 12, that is, reinforcement plates 15 are provided on the front and rear sides of the mounting platform 12. The reinforcement plates 15 as a whole are close to a triangular plate structure. The side walls of the reinforcement plates 15 are connected to the side walls of the mounting platform 12, and the bottom of the reinforcement plates 15 is connected to the top of the frame 11, thereby increasing the connection area between the mounting platform 12 and the frame 11, and increasing the connection strength and connection stability of the mounting platform 12.

[0044] Further, such as Figure 3 As shown, the interior of the mounting platform 12 is configured as a hollow structure, which can reduce the weight and cost of the mounting platform 12; wherein, the mounting platform 12 is provided with reinforcing ribs 123, and there are at least two reinforcing ribs 123, which are staggered. In this embodiment, the crossing angle between the reinforcing ribs 123 and the reinforcing ribs 123 is 90 degrees, which can facilitate the connection between the reinforcing ribs 123 and the reinforcing ribs 123; Figure 3 As shown, the reinforcing ribs 123 are connected to form multiple rectangular frame structures, which can enhance the internal structural stability and structural strength of the mounting platform 12, ensure the structural strength and stability of the connection between the arm mounting seat and the telescopic arm, and make the frame 1 more stable and firm.

[0045] Further, such as Figure 3 As shown, a space-avoiding structure 124 is provided in the installation platform 12 , and the space-avoiding structure 124 is used to avoid the engine or the reducer, so as to prevent the engine or the reducer from affecting the installation platform 12 .

[0046] On the basis of any of the above embodiments, the frame 1 for the arch trolley is further expanded; Figure 4 As shown, the frame 11 includes a first beam section 111 and a second beam section 112, and the first beam section 111 is connected to the second beam section 112. The cross-sectional width of the first beam section 111 is greater than the cross-sectional width of the second beam section 112, so that the cross-sectional width of the frame 1 is a variable cross-sectional structure, so that the staff can install the power system on the first beam section 111 and install the axle on the second beam section 112. The cross-sectional width of the second beam section 112 is smaller. When the frame 1 turns, the axle will not easily collide or squeeze with the second beam section 112, and the cross-sectional width of the first beam section 111 is larger, which can meet the width requirement of the power system for the frame 1, so that the frame 1 does not need to be equipped with an additional expansion structure to install the power system. The frame 1 presents an integrated structure, which can ensure the structural rigidity and structural strength as much as possible, and the structure of the frame 1 is also more stable.

[0047] Further, such as Figure 1 、 Figure 2 As shown, the first beam section 111 is divided into a power installation beam section 1111 and an axle installation beam section 1112, wherein the axle installation beam section 1112 is used to install one axle, the second beam section 112 is used to install the other axle, and the power installation beam section 1111 is used to install the power system; wherein the axle installation beam section 1112, the power installation beam section 1111 and the second beam section 112 are smoothly connected, and the axle installation beam section 1112 and the second beam section 112 are connected to both ends of the power installation beam section 1111, wherein, as shown Figure 2As shown, the cross-sectional width of the axle mounting beam section 1112 is A, the cross-sectional width of the power mounting beam section 1111 is B, and the cross-sectional width of the second beam section 112 is C, wherein B>A and B>C, thereby making the cross-sectional width of the power mounting beam section 1111 larger, which can meet the requirements of installing the power system, while the cross-sectional widths of the axle mounting beam section 1112 and the power mounting beam section 1111 are smaller, which can reduce the inward squeezing of the axle on the width direction of the frame 1 during steering, thereby reducing damage to the frame 1; the variable cross-sectional structure setting of the frame 1 enables the frame 1 to meet the requirements of axle steering and the requirements of the power system for a larger installation space. The frame 1 does not need to use an additional mounting platform 12 to install the power system, so that the frame 1 is an integrated structure with good overall structural strength and good structural rigidity. The frame 1 is also more stable and will not easily come off.

[0048] Further, such as Figure 4 As shown, the cross-sectional width C of the second beam section 112 is smaller than the cross-sectional width A of the axle mounting beam section 1112. By reducing the cross-sectional width of the second beam section 112, while ensuring that it can meet the axle installation requirements, the manufacturing area and weight of the second beam section 112 can be reduced, thereby reducing the weight and manufacturing cost of the entire frame 1.

[0049] It should be noted that, in this embodiment, Figure 1 、 Figure 4 As shown, the mounting platform 12 is located above the support leg seat 16, and the mounting platform 12 is arranged above the power mounting beam section 1111 and the second beam section 112. The bottom of the mounting platform 12 is at least partially connected to the power mounting beam section 1111 and at least partially connected to the second beam section 112, that is, the mounting platform 12 spans the power mounting beam section 1111 and the second beam section 112.

[0050] like Figure 1 、 Figure 5 As shown, the axle mounting beam section 1112 is a box-type structure, and the power mounting beam section 1111 is a box-type structure. The axle mounting beam section 1112 is smoothly connected with the side wall of the power mounting beam section 1111, wherein the axle mounting beam section 1112 and the power mounting beam section 1111 can also be set as an integrated structure, which is beneficial to increase the structural stability and structural strength of the frame 1; in this embodiment, the axle mounting beam section 1112 and the power mounting beam section 1111 between the support leg slide and the support leg seat 16, that is, the front and rear support legs of the frame 1 are set as a box-type structure, which can greatly improve the structural torsion resistance and solve the problem of the support legs leaving the ground; at the same time, the box-type structure can use thinner steel plates, thereby achieving a certain weight reduction purpose, so that the overall weight of the frame 1 is reduced, which is more convenient for transportation and driving.

[0051] like Figure 1 、 Figure 6As shown, second beam section 112 is an I-shaped structure. Located at the rear end of vehicle frame 1, this I-beam structure provides a relatively simple structure and an ideal mounting base. It requires no additional structural reinforcement during equipment installation and can serve directly as the mounting base, while also providing good structural strength. The I-shaped structure of second beam section 112, combined with the box-shaped structure of axle mounting beam section 1112 and powertrain mounting beam section 1111, ensures that vehicle frame 1 meets strength requirements while maintaining a simplified structure. This facilitates the installation of various systems in the complex engine area and the routing of wiring harnesses.

[0052] like Figure 1 、 Figure 4 As shown, the frame 1 also includes a leg seat 16, which is arranged at the rear end of the power installation beam section 1111. There are two leg seats 16, which are symmetrically arranged on both sides of the frame 1. The leg seats 16 are used to install fixed legs; specifically, as shown Figure 2 As shown, the leg seat 16 includes a horizontal extension portion 161 and a vertical extension portion 162. The horizontal extension portion 161 is extended in the horizontal direction, and the vertical extension portion 162 is extended in the vertical direction toward the lower end. The vertical extension portion 162 is connected to the outer side of the horizontal extension portion 161, and the vertical extension portion 162 and the horizontal extension portion 161 form a side L-shaped structure; wherein, the inner end of the horizontal extension portion 161 is connected to the power installation beam section 1111 and the second beam section 112, that is, the horizontal extension portion 161 is at least partially connected to the side wall of the power installation beam section 1111, and at least partially connected to the side wall of the second beam section 112, so that the horizontal extension portion 161 is connected to the junction of the power installation beam section 1111 and the second beam section 112, thereby enhancing the connection stability of the leg seat 16, and can also enhance the connection stability of the power installation beam section 1111 and the second beam section 112.

[0053] like Figure 1 、 Figure 4 As shown, in the present application, the axle mounting beam section 1112, the power mounting beam section 1111 and the second beam section 112 are H-shaped structures, including two left and right main beams, which are hollow inside, and the two main beams are connected by cross beams to enhance the structural strength; wherein, at least one first cross beam is provided in the axle mounting beam section 1112, at least one second cross beam is provided in the power mounting beam section 1111, and at least one third cross beam is provided in the second beam section 112; in the present application, the first cross beam, the second cross beam and the third cross beam are located at the bottom of the frame 1 to enhance the connection strength of the bottom of the frame 1; the structures of the cross beams may be the same or different, and when the beam section where they are located has an upper cover plate, the cross beam is in a U-shape and is connected to the upper cover plate and side wall of the beam section at the same time; when the upper end of the beam section where the cross beam is located is open, the two ends of the cross beam are only connected to the inner side wall of the beam section.

[0054] like Figure 1 、 Figure 4As shown, the vehicle frame 1 further includes a first mounting seat 13, which is arranged at one end of the first beam section 111 away from the second beam section 112, or at one end of the second beam section 112 away from the first beam section 111, that is, the first mounting seat 13 can be arranged at the front end of the vehicle frame 1 or at the rear end of the vehicle frame 1; the first mounting seat 13 is used to mount the support leg; wherein the first mounting seat 13 can be set as a support leg slide, such as Figure 1 As shown, the leg slide is set as a hollow structure, and the leg slide is used to install the telescopic legs to achieve span adjustment, thereby improving the stability and adaptability of the frame 1 system; wherein, the telescopic legs can be multi-stage telescopic or single-stage telescopic, and the telescopic method can be straight extension, oblique extension (eight-shaped), or non-telescopic.

[0055] like Figure 1 、 Figure 4 As shown, the frame 1 also includes a second mounting seat 14, which is arranged at the end of the second beam section 112 away from the first beam section 111, or at the end of the first beam section 111 away from the second beam section 112, that is, the second mounting seat 14 can be arranged at the front end of the frame 1, or at the rear end of the frame 1; the second mounting seat 14 is used to install a counterweight box. In this embodiment, the counterweight box is a flexible configuration item, and it can flexibly adjust the counterweight weight when responding to different front-end loads to achieve a wider adaptability; and its counterweight can be solid or liquid, and the specific setting can be selected according to actual needs.

[0056] In another optional embodiment of the present application, a first mounting seat 13 is provided at the front end of the frame 1, and the first mounting seat 13 is used to install the telescopic legs. A second mounting seat 14 is provided at the rear end of the frame 1, and the second mounting seat 14 is used to install the counterweight box.

[0057] It should be noted that the various embodiments of the present application can be arbitrarily combined into new embodiments if the solutions do not conflict and the technical solutions can coexist.

[0058] The present application has been described in detail above. Specific examples have been used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is intended only to facilitate understanding of the present application and its core concepts. It should be noted that, without departing from the principles of the present application, a number of improvements and modifications may be made to the present application by a person skilled in the art, and such improvements and modifications shall fall within the scope of protection of the claims of the present application.

Claims

1. A frame for an arch trolley, characterized in that: The invention comprises a frame (11) and a mounting platform (12), wherein the mounting platform (12) is arranged on the frame (11), wherein the mounting platform (12) is a box structure, and at least one arm mounting seat is provided on the mounting platform (12).

2. The frame for the arch trolley according to claim 1, characterized in that: Reinforcement plates (15) are provided on both sides of the installation platform (12), the side walls of the reinforcement plates (15) are connected to the side walls of the installation platform (12), and the bottom of the reinforcement plates (15) is connected to the frame (11).

3. The frame for the arch trolley according to claim 1, characterized in that: Reinforcing ribs (123) are provided in the installation platform (12), the reinforcing ribs (123) are arranged in a staggered manner, and the reinforcing ribs (123) are used to strengthen the structural strength of the installation platform (12).

4. The frame for the arch trolley according to claim 1, characterized in that: The frame (11) comprises a first beam section (111) and a second beam section (112), wherein the first beam section (111) is connected to the second beam section (112), wherein the cross-sectional width of the first beam section (111) is greater than the cross-sectional width of the second beam section (112).

5. The frame for the arch trolley according to claim 4, characterized in that: The first beam section (111) is divided into a power installation beam section (1111) and an axle installation beam section (1112); the power installation beam section (1111) is connected to the axle installation beam section (1112); and the cross-sectional width of the power installation beam section (1111) is greater than the cross-sectional width of the axle installation beam section (1112).

6. The frame for the arch trolley according to claim 5, characterized in that: One end of the power installation beam section (1111) is connected to the axle installation beam section (1112), and the other end of the power installation beam section (1111) is connected to the second beam section (112); Wherein, the cross-sectional width of the second beam section (112) is smaller than the cross-sectional width of the axle mounting beam section (1112).

7. The frame for the arch trolley according to claim 4, characterized in that: The first beam section (111) is a box-shaped structure, and the second beam section (112) is an I-shaped structure.

8. The frame for the arch trolley according to claim 4, characterized in that: The invention also includes a leg seat (16), wherein the leg seat (16) includes a horizontal extension portion (161) and a vertical extension portion (162), wherein one end of the horizontal extension portion (161) is connected to the junction of the first beam section (111) and the second beam section (112), and the vertical extension portion (162) is connected to the other end of the horizontal extension portion (161); The leg support (16) is used for installing the fixed leg.

9. The frame for the arch trolley according to claim 1, characterized in that: It also includes a first mounting seat (13), which is arranged at the end of the frame (11) and is used to mount the supporting legs.

10. The frame for the arch trolley according to claim 1, characterized in that: It also includes a second mounting seat (14), which is arranged at the end of the frame (11), and the second mounting seat (14) is used to install a counterweight box.

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