Limiting hinge and operation machine

Abstract

The utility model relates to the technical field of working machinery, and discloses a limiting hinge and working machinery, and the limiting hinge comprises a rotating shaft, a first hinge and a second hinge. A first sleeve is arranged on one side surface of the first hinge, and a clamping groove is formed in the other side surface; a second sleeve is arranged on one side surface of the second hinge, and a rotatable limiting rod is arranged on the other side surface; the rotating shaft is sleeved with the first sleeve and the second sleeve, a first notch is formed in the first sleeve, and a second notch is formed in the end, corresponding to the first notch, of the second sleeve; and under the condition that the first hinge and the second hinge are opened to the maximum angle, the first notch and the second notch abut against each other and are clamped with the clamping groove through the limiting rod, and the first hinge and the second hinge are limited at the maximum angle. According to the utility model, the limiting rod is arranged on the second hinge and is clamped with the clamping groove on the first hinge to realize limiting, so that the installation volume is reduced, and the hinge can be used in a narrow environment and is wide in application.

Description

Technical Field

[0001] The utility model relates to the technical field of operating machinery, in particular to a limit hinge and an operating machinery. Background Art

[0002] In order to facilitate inspection and maintenance, the operating machinery is usually provided with a door body that can be opened and closed at the frame. The door body is usually connected to the frame by hinges. In addition, the operating machinery is also provided with a limit structure to limit the door body to remain in the open state, such as using a support rod to support the door body.

[0003] The existing limiting structure is usually arranged between the door body and the frame, which is large in size and has high requirements for installation space, so it cannot be used in a narrow space environment. Utility Model Content

[0004] In view of this, the utility model provides a limit hinge and an operating machine to solve the problem that the existing limit structure is large in size and cannot be used in a narrow space.

[0005] In a first aspect, the utility model provides a limit hinge, comprising:

[0006] Rotating shaft;

[0007] The first hinge has a first sleeve on one side and a slot on the other side;

[0008] The second hinge has a second sleeve on one side and a rotatable limiting rod on the other side;

[0009] The first sleeve and the second sleeve are respectively sleeved on the rotating shaft, the first sleeve is provided with a first notch, and the second sleeve is provided with a second notch at one end corresponding to the first notch;

[0010] When the first hinge and the second hinge are opened to the maximum angle, the first notch and the second notch abut against each other, and the limiting rod is engaged with the card slot to limit the first hinge and the second hinge to the maximum angle.

[0011] Beneficial effects: The utility model can limit the first hinge and the second hinge to a maximum opening angle by rotating the first hinge and the second hinge so that the first cutout on the first hinge abuts against the second cutout on the second hinge. Afterwards, the limit rod is engaged with the card slot at this angle to fix the relative position of the first hinge and the second hinge. The limit rod and the card slot are respectively arranged at the first hinge and the second hinge, and the structure is simple and the installation volume is small, which can meet the use conditions of narrow spaces and has a wide range of applications.

[0012] In an optional embodiment, one end of the first sleeve is cut along the axial direction to form an arc-shaped flange, and the arc-shaped flange serves as the first incision.

[0013] Beneficial effect: one end of the first sleeve is cut along the axial direction to form an arc-shaped flange, and the arc-shaped flange serves as the first incision, which has a simple structure and is easy to manufacture.

[0014] In an optional embodiment, one end of the second sleeve close to the first incision is cut axially to form an arc-shaped groove, and the arc-shaped groove serves as the second incision.

[0015] Beneficial effect: The second sleeve is axially cut at one end close to the first incision to form an arc-shaped groove. The arc-shaped groove serves as the second incision. The maximum opening angle of the first hinge and the second hinge can be adjusted by adjusting the curvature of the cut arc-shaped flange and / or the arc-shaped groove, which is convenient for manufacturing and use.

[0016] In an optional embodiment, a groove is provided at the position of the first hinge installation slot, and the slot is arranged in the groove.

[0017] Beneficial effect: a groove is firstly provided at the first hinge, and then a card slot is provided at the groove. On the one hand, the structural strength of the card slot can be improved, and on the other hand, the card slot can be embedded in the first hinge, thereby reducing the space occupied by the card slot and saving installation space.

[0018] In an optional embodiment, a mounting hole is provided on one side of the second hinge, one end of the limiting rod is bent and rotatably connected to the mounting hole, and the other end of the limiting rod is provided with a clamping portion suitable for clamping with the clamping slot.

[0019] Beneficial effect: A mounting hole is provided on one side of the second hinge, one end of the limiting rod is bent and rotatably connected to the mounting hole, and the other end is provided with a clamping portion, which facilitates the limiting rod to rotate around the mounting hole so that the clamping portion is clamped with the clamping slot for easy operation.

[0020] In an optional embodiment, the clamping portion is further provided with a pair of retaining rings at intervals, and the pair of retaining rings are suitable for being located at opposite sides of the clamping groove, respectively.

[0021] Beneficial effect: A pair of retaining rings are provided at intervals on the clamping part, and the pair of retaining rings are suitable for being located on opposite sides of the clamping slot respectively. The pair of retaining rings can limit the opposite sides of the clamping part respectively, thereby improving the clamping stability between the clamping part and the clamping slot.

[0022] In an optional embodiment, a receiving seat suitable for receiving the limiting rod is also provided on a side surface of the second hinge provided with the limiting rod, and the receiving seat and the mounting hole are spaced apart along the length direction of the second hinge.

[0023] Beneficial effect: by arranging a storage seat on the surface of the second hinge, the limit rod can be fixed at the storage seat when the limit rod is idle, so as to prevent the idle limit rod from shaking, and the operation is simple. In addition, the space occupied by the limit rod can be reduced.

[0024] In an optional embodiment, one end of the storage seat is fixedly connected to the second hinge, and an arc surface is formed relative to the other end, and the arc surface is suitable for clamping the rod body of the limiting rod.

[0025] Beneficial effect: One end of the storage seat is fixedly connected to the second hinge, and an arc surface is formed relative to the other end. The arc surface is used to clamp the rod body of the limit rod, which can improve the connection stability between the limit rod and the storage seat.

[0026] In an optional embodiment, the limiting rod is a wind hook.

[0027] Beneficial effect: the limit rod is a wind hook, which is convenient to use and has low use cost.

[0028] In a second aspect, the utility model further provides an operating machine, comprising:

[0029] frame;

[0030] Door body;

[0031] In the above-mentioned position-limiting hinge, one of the first hinge and the second hinge is arranged on the frame, and the other is arranged on the door body.

[0032] Beneficial effect: Because the operating machine includes a limit hinge, it has the same effect as the limit hinge, that is, by rotating the first hinge and the second hinge, the first notch on the first hinge abuts against the second notch on the second hinge, and the first hinge and the second hinge can be limited to the maximum opening angle. Afterwards, the limit rod is engaged with the card slot at this angle, and the relative position of the first hinge and the second hinge can be fixed to achieve the fixation of the operating machine door body. The limit rod and the card slot are respectively arranged at the first hinge and the second hinge, and the structure is simple, easy to process, and the installation volume is small, which can meet the use conditions of narrow spaces and is widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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.

[0034] Figure 1 It is a structural schematic diagram of a limit hinge in one state of an embodiment of the utility model;

[0035] Figure 2 It is a structural schematic diagram of another state of a limit hinge in an embodiment of the utility model;

[0036] Figure 3This is a schematic structural diagram of a first hinge in a position-limiting hinge according to an embodiment of the utility model;

[0037] Figure 4 It is a structural schematic diagram of a second hinge in a position-limiting hinge according to an embodiment of the utility model;

[0038] Figure 5 The present invention is a schematic structural diagram of a storage seat in a position-limiting hinge according to an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Rotating shaft; 2. First hinge; 201. First sleeve; 202. Slot; 203. First incision; 204. Groove; 205. First fixing hole; 3. Second hinge; 301. Second sleeve; 302. Mounting hole; 303. Second incision; 304. Storage seat; 305. Second fixing hole; 4. Limiting rod; 401. Clamping part; 402. Retaining ring. DETAILED DESCRIPTION

[0041] 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.

[0042] The existing limit structure is set between the door body and the frame, which is large in size and has high requirements for installation space, resulting in the problem that it cannot be used in a narrow space environment. In the embodiment of the utility model, a card slot is set at the first hinge, and a limit rod is set at the second hinge. The limit rod is connected with the card slot to limit the first hinge and the second hinge to a maximum angle, thereby reducing the installation volume, being applicable to a narrow space environment, and having a wide range of applications.

[0043] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0044] According to an embodiment of the present utility model, on the one hand, as Figures 1 to 4As shown, a limit hinge is provided, which mainly includes: a rotating shaft 1, a first hinge 2 and a second hinge 3. A first sleeve 201 is provided on one side of the first hinge 2, and a clamping groove 202 is provided on the other side. A second sleeve 301 is provided on one side of the second hinge 3, and a rotatable limit rod 4 is provided on the other side. The first sleeve 201 and the second sleeve 301 are respectively sleeved on the rotating shaft 1, and a first notch 203 is provided on the first sleeve 201, and a second notch 303 is provided on one end of the second sleeve 301 corresponding to the first notch 203. When the first hinge 2 and the second hinge 3 are opened to the maximum angle, the first notch 203 and the second notch 303 abut against each other, and the limit rod 4 is clamped with the clamping groove 202, so that the first hinge 2 and the second hinge 3 are limited to the maximum angle.

[0045] The embodiment of the utility model can limit the first hinge 2 and the second hinge 3 to a maximum opening angle by rotating the first hinge 2 and the second hinge 3 so that the first notch 203 on the first hinge 2 abuts against the second notch 303 on the second hinge 3. Afterwards, the limiting rod 4 is engaged with the card slot 202 at this angle to fix the relative position of the first hinge 2 and the second hinge 3, so as to achieve the fixation of the door body of the operating machine relative to the frame. The limiting rod 4 and the card slot 202 are respectively arranged at the first hinge 2 and the second hinge 3, and the structure is simple, easy to process, and the installation volume is small, which can meet the use conditions of narrow spaces and has a wide range of applications.

[0046] Specifically, the rotating shaft 1 is used to connect the first hinge 2 and the second hinge 3. The rotating shaft 1 can be a pin. Figure 1 As shown, when the limiting rod 4 is engaged with the card slot 202, the first hinge 2 and the second hinge 3 are fixed at the maximum opening angle, so that the door body and the frame connected to the first hinge 2 and the second hinge 3 are limited. The first notch 203 and the second notch 303 have a certain curvature, and the maximum opening angle is determined by the curvature of the first notch 203 and the second notch 303. The maximum opening angle of the embodiment of the utility model is about 85°. Of course, in some other embodiments, the maximum opening angle can also be set to other angles according to actual needs.

[0047] In addition, if Figure 2 As shown, when the limiting rod 4 is released from the locking groove 202, the first hinge 2 and the second hinge 3 can rotate freely around the pin within a certain range.

[0048] Specifically, the first hinge 2 and the second hinge 3 can be made of metal materials, such as stainless steel, aluminum alloy, etc., which have good strength and corrosion resistance and can be used with operating machinery in harsh environments. In addition, they are easy to process and convenient for manufacturing the first sleeve 201, the second sleeve 301, the first incision 203 and the second incision 303.

[0049] It should be noted that the embodiment of the utility model does not limit the number of the first sleeve 201 and the second sleeve 301. The first sleeve 201 can be set to one, two, three or more according to actual needs. Similarly, the second sleeve 301 can also be set to one, two, three or more. In addition, the number of the first notch 203 and the second notch 303 is not limited, as long as the first hinge 2 and the second hinge 3 are opened to the maximum angle, the first notch 203 can abut against the second notch 303, and the first hinge 2 and the second hinge 3 can be limited.

[0050] For example, Figure 3 As shown, two coaxially arranged first sleeves 201 are spaced apart in the middle area of ​​one side of the first hinge 2. The first sleeve 201 can be formed by bending one side of the first hinge 2. The two first sleeves 201 are respectively provided with first cutouts 203 at opposite ends. Figure 4 As shown, three coaxially arranged second sleeves 301 are arranged at intervals on one side of the second hinge 3, and the inner sides of the two second sleeves 301 located at opposite ends are provided with second cutouts 303 that match the first cutouts 203. The second sleeves 301 can be formed by bending one side of the second hinge 3. The intervals between the three second sleeves 301 form a receiving groove for installing the two first sleeves 201. In addition, the first sleeve 201, the second sleeve 301 and the rotating shaft 1 can also be coaxially arranged.

[0051] Compared with the traditional structure of welding a limit block on the hinge plate to achieve the limit, the embodiment of the utility model can achieve the limit of the first hinge 2 and the second hinge 3 at the maximum opening angle only by the first notch 203 and the second notch 303 interlocking with each other, which has a simple structure, is easy to process, occupies little space, and has a simple appearance.

[0052] It should be noted that the embodiment of the utility model does not limit the structure of the first incision 203 and the second incision 303. The structure of the first incision 203 and the second incision 303 can be any existing structure as needed.

[0053] In one embodiment, Figure 3 As shown, one end of the first sleeve 201 is cut along the axial direction to form an arc-shaped flange, and the arc-shaped flange serves as the first incision 203, which has a simple structure and is easy to manufacture.

[0054] In one embodiment, Figure 4As shown, one end of the second sleeve 301 close to the first incision 203 is cut axially to form an arcuate groove, and the arcuate groove serves as the second incision 303. The side wall of the arcuate flange abuts against the side wall of the arcuate groove to achieve the limitation of the first hinge 2 and the second hinge 3 at the maximum opening angle. The maximum opening angle of the first hinge 2 and the second hinge 3 can be adjusted by adjusting the curvature of the cut arcuate flange and / or the arcuate groove, which is convenient for manufacturing and use. For example, the larger the size of the second sleeve 301 cut along the axial direction, the smaller the arc surface of the arcuate groove, and the larger the maximum opening angle of the first hinge 2 and the second hinge 3.

[0055] In one embodiment, Figure 3 As shown, a groove 204 is provided at the position where the first hinge 2 is installed with the slot 202, and the slot 202 is provided in the groove 204. The groove 204 is first provided at the first hinge 2, and then the slot 202 is provided at the groove 204. On the one hand, the structural strength of the slot 202 can be improved, and on the other hand, the slot 202 can be embedded inside the first hinge 2, thereby reducing the occupied space of the slot 202 and saving installation space. For the convenience of manufacturing and use, the slot 202 and the groove 204 can be integrally formed. Alternatively, the slot 202 is welded on the side wall of the groove 204.

[0056] It should be noted that the embodiment of the utility model does not limit the structure of the limit rod 4. The limit rod 4 can select any existing structure as needed. In addition, the limit rod 4 can be set at any position on the surface of the second hinge 3 as needed, such as the middle area or the end area.

[0057] In one embodiment, a mounting hole 302 is provided on one side of the second hinge 3, one end of the limiting rod 4 is bent and rotatably connected to the mounting hole 302, and the other end of the limiting rod 4 is provided with a clamping portion 401, which facilitates the limiting rod 4 to rotate around the mounting hole 302. The clamping portion 401 is suitable for clamping with the clamping slot 202, so as to facilitate the clamping of the limiting rod 4 and the first hinge 2, and facilitate operation.

[0058] Specifically, Figure 1 and Figure 4 As shown, the limiting rod 4 is a round rod, and the mounting hole 302 is a round hole. The mounting hole 302 is located at the outer end of the surface of the second hinge 3 so that the limiting rod 4 can rotate. The limiting rod 4 and the mounting hole 302 are clearance-matched, and the limiting rod 4 can rotate freely at the mounting hole 302 so as to adjust the position of the limiting rod 4 so that the clamping portion 401 of the limiting rod 4 is clamped with the clamping slot 202, or the clamping connection between the two is released. The clamping slot 202 can adopt a U-shaped groove and the side walls at both ends thereof are concave to form a clamping interface. The clamping portion 401 can be inserted into the clamping slot 202 and rotated to the clamping interface to realize clamping, and is firmly fixed. In addition, the clamping connection between the two can be released by only pulling the clamping portion 401 out of the clamping slot 202, which is convenient for use.

[0059] Further, in one embodiment, if Figure 2 As shown, the clamping portion 401 is also provided with a pair of retaining rings 402 at intervals, and the pair of retaining rings 402 are suitable for being respectively located at opposite sides of the clamping slot 202. The pair of retaining rings 402 can limit the opposite sides of the clamping portion 401 respectively, thereby improving the clamping stability between the clamping portion 401 and the clamping slot 202.

[0060] Specifically, the rod body portion between the pair of retaining rings 402 of the limiting rod 4 serves as the clamping portion 401 and can be clamped with the clamping groove 202 , further simplifying the structure of the limiting rod 4 .

[0061] In order to reduce the use cost, in one embodiment, the limiting rod 4 is a wind hook, which is also convenient to use.

[0062] In one embodiment, Figure 2 and Figure 4 As shown, a receiving seat 304 suitable for receiving the limiting rod 4 is also provided on a side surface of the second hinge 3 provided with the limiting rod 4. The receiving seat 304 and the mounting hole 302 are arranged at intervals along the length direction of the second hinge 3. By providing the receiving seat 304 on the surface of the second hinge 3, the limiting rod 4 can be fixed at the receiving seat 304 when the limiting rod 4 is idle, so that the limiting rod 4 can be stored conveniently, and the idle limiting rod 4 can be prevented from shaking, which is simple to operate. In addition, the space occupied by the limiting rod 4 can be reduced.

[0063] Further, in one embodiment, if Figure 5 As shown, one end of the storage seat 304 is fixedly connected to the second hinge 3, and the other end forms an arc surface, which is suitable for clamping the rod body of the limit rod 4. The arc surface also extends outward to form a pair of baffles. The rod body of the limit rod 4 can enter the arc surface along the surface of the baffle and be clamped by the arc surface. The state in which the rod body of the limit rod 4 is clamped on the arc surface of the storage seat 304, as shown in FIG. Figure 2 The arc surface of the storage seat 304 is elastic, and the elasticity of the arc surface is used to clamp the rod body of the limit rod 4, which can improve the connection stability between the limit rod 4 and the storage seat 304. In addition, the arc surface is not easy to accumulate dust, is easy to clean, and has no risk of stress concentration, and has a stable structure.

[0064] Specifically, Figure 4 As shown, a convex surface is welded on the surface of the second hinge 3, and one end of the storage seat 304 is fixedly connected to the convex surface. The fixed connection structure can be a clamping type fixed structure, or can be set as a fastening type fixed structure, which is not limited in the embodiment of the utility model.

[0065] In some other embodiments, the storage seat 304 can also form a regular shape such as a triangular surface, a rectangular surface, etc. to clamp the rod body of the limit rod 4, or can select an irregular shape to clamp the rod body of the limit rod 4, and the embodiments of the utility model are not limited to this.

[0066] Furthermore, the storage seat 304 can be a metal part or a plastic part, and the embodiment of the utility model does not limit this. In order to reduce the use cost and consider the lightweight design requirements, in one embodiment, the storage seat 304 is a plastic part. If a plastic part is selected, it can be integrally injection molded or multi-layer injection molded. The embodiment of the utility model does not limit this.

[0067] According to an embodiment of the present utility model, on the other hand, a working machine is provided, which mainly comprises: a frame, a door body and a limit hinge. One of the first hinge 2 and the second hinge 3 is arranged on the frame, and the other is arranged on the door body.

[0068] Because the operating machine includes a limit hinge, it has the same effect as the limit hinge, that is, by rotating the first hinge 2 and the second hinge 3, the first notch 203 on the first hinge 2 abuts against the second notch 303 on the second hinge 3, so that the first hinge 2 and the second hinge 3 can be limited to the maximum opening angle. Afterwards, the limit rod 4 is engaged with the clamping groove 202 at this angle, so that the relative positions of the first hinge 2 and the second hinge 3 can be fixed to achieve the fixation of the operating machine door body. The limit rod 4 and the clamping groove 202 are respectively arranged at the first hinge 2 and the second hinge 3, with a simple structure, convenient processing, and a small installation volume, which can meet the use conditions of narrow spaces and is widely used.

[0069] In addition, by engaging the limiting rod 4 with the card slot 202 and fixing the relative positions of the first hinge 2 and the second hinge 3, the door body can be limited to the maximum opening angle relative to the frame, so that the operator can inspect the components inside the door body.

[0070] Specifically, the working machinery includes but is not limited to excavators, cranes, pile drivers, mixers, etc.

[0071] It should be noted that the embodiment of the utility model does not limit the connection method between the first hinge 2, the second hinge 3 and the frame and the door body. It can be a snap-on structure or a fastener structure.

[0072] Compared with the snap-on structure, the fastener structure is more secure and can adapt to harsh working conditions. Figure 3 As shown, first fixing holes 205 are respectively provided at opposite ends of the plate surface of the first hinge 2. First connecting holes are provided on the frame corresponding to the first fixing holes 205. A pair of fasteners are respectively passed through the two first fixing holes 205 and the two first connecting holes to fix the first hinge 2 on the frame.

[0073] Likewise, if Figure 4As shown, the second hinge 3 has second fixing holes 305 at opposite ends of the plate surface. The door body has second connecting holes corresponding to the second fixing holes 305. Another pair of fasteners passes through the two second fixing holes 305 and the two second connecting holes respectively to fix the second hinge 3 on the door body.

[0074] Specifically, the fasteners may be bolts or screws that are easy to disassemble, and the first connecting holes and the second connecting holes may be threaded holes, which have low cost and are easy to install and disassemble.

[0075] In one embodiment, the door body can also be in a normally open state. When the first hinge 2 and the second hinge 3 are opened to the maximum angle, the door body is in a state of minimum closing angle, so that the minimum closing angle of the door body is limited by the limit hinge.

[0076] The working process of the embodiment of the utility model is as follows:

[0077] When the door is opened, an external force is applied to the door, and the first sleeve 201 of the first hinge 2 rotates relative to the second sleeve 301 of the second hinge 3 through the rotating shaft 1 until the first notch 203 abuts against the second notch 303. Then, the clamping portion 401 of the limit rod 4 is clamped with the clamping groove 202 of the first hinge 2, and the relative angle between the first hinge 2 and the second hinge 3 is fixed, that is, the opening angle of the door relative to the frame is fixed.

[0078] When closing the door, first release the engagement between the engaging portion 401 and the engaging slot 202, then rotate the limiting rod 4 so that the rod body of the limiting rod 4 engages with the arc surface of the receiving seat 304 to receive the limiting rod 4. The first hinge 2 and the second hinge 3 can rotate freely through the rotating shaft 1. Finally, close the door.

[0079] In order to realize the basic functions of the working machine, the working machine in this embodiment may also include other necessary modules or components, such as actuators, wheels, etc. It should be noted that the other necessary modules or components included in the working machine can be selected from any suitable existing structures. In order to clearly and briefly explain the technical solution provided by this embodiment, the above part will not be repeated here, and the drawings in the specification are also simplified accordingly. However, it should be understood that the scope of the utility model is not limited by this.

[0080] 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 limit hinge, characterized in that: include: A rotating shaft (1); A first hinge (2), one side of which is provided with a first sleeve (201), and the other side of which is provided with a slot (202); The second hinge (3) has a second sleeve (301) on one side and a rotatable limiting rod (4) on the other side; The first sleeve (201) and the second sleeve (301) are respectively sleeved on the rotating shaft (1); the first sleeve (201) is provided with a first notch (203); and the second sleeve (301) is provided with a second notch (303) at one end corresponding to the first notch (203); When the first hinge (2) and the second hinge (3) are opened to a maximum angle, the first notch (203) and the second notch (303) abut against each other, and the limiting rod (4) is engaged with the locking groove (202), thereby limiting the first hinge (2) and the second hinge (3) to a maximum angle.

2. The limit hinge according to claim 1, characterized in that: One end of the first sleeve (201) is cut along the axial direction to form an arc-shaped flange, and the arc-shaped flange serves as the first incision (203).

3. The limit hinge according to claim 2, characterized in that: One end of the second sleeve (301) close to the first cutout (203) is cut along the axial direction to form an arc-shaped groove, and the arc-shaped groove serves as the second cutout (303).

4. The limit hinge according to any one of claims 1 to 3, characterized in that: A groove (204) is provided at the position where the first hinge (2) is installed with the card slot (202), and the card slot (202) is arranged in the groove (204).

5. The limit hinge according to any one of claims 1 to 3, characterized in that: A mounting hole (302) is provided on one side of the second hinge (3); one end of the limiting rod (4) is bent and rotatably connected to the mounting hole (302); the other end of the limiting rod (4) is provided with a clamping portion (401), and the clamping portion (401) is suitable for clamping with the clamping slot (202).

6. The position-limiting hinge according to claim 5, characterized in that: The clamping portion (401) is further provided with a pair of retaining rings (402) at intervals, and the pair of retaining rings (402) are suitable for being located at opposite sides of the clamping groove (202) respectively.

7. The position-limiting hinge according to claim 5, characterized in that: The second hinge (3) is provided with a storage seat (304) suitable for accommodating the limiting rod (4) on one side surface of the second hinge (3), and the storage seat (304) and the mounting hole (302) are arranged at intervals along the length direction of the second hinge (3).

8. The limit hinge according to claim 7, characterized in that: One end of the storage seat (304) is fixedly connected to the second hinge (3), and an arc surface is formed relative to the other end, and the arc surface is suitable for clamping the rod body of the limiting rod (4).

9. The limit hinge according to any one of claims 1 to 3, characterized in that: The limiting rod (4) is a wind hook.

10. A working machine, characterized in that: include: frame; Door body; The position limiting hinge according to any one of claims 1 to 9, wherein one of the first hinge (2) and the second hinge (3) is arranged on the frame, and the other is arranged on the door body.

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