Bolt device, turnover supporting leg and crane

Abstract

The invention discloses a plug pin device, a turnover supporting leg and a crane. The plug pin device comprises a shaft sleeve and a pin shaft assembly. The shaft sleeve is sequentially provided with a first chute and a second chute in the length direction, and the first chute and the second chute are reversely and obliquely arranged in the circumferential direction of the shaft sleeve. The pin shaft assembly comprises a first pin shaft, a second pin shaft and a reset elastic piece, the first pin shaft and the second pin shaft are arranged in the shaft sleeve in a penetrating mode, the two ends of the first pin shaft and the two ends of the second pin shaft are each provided with a splicing part and a pin mounting part, the splicing parts of the first pin shaft and the second pin shaft are spliced in the circumferential direction to form a mounting cavity, and the reset elastic piece is arranged in the mounting cavity. The first pin shaft is provided with a pull rod penetrating through the first inclined groove to extend out, and the second pin shaft is provided with a limiting pin penetrating through the second inclined groove to extend out. The splicing parts of the first pin shaft and the second pin shaft are connected in a splicing mode, so that the first pin shaft can drive the second pin shaft to move, the locking state and the unlocking state are switched, and operation is convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of cranes, and particularly relates to a pin device, a tipping leg and a crane. Background Art

[0002] A truck-mounted crane is generally configured on an automobile chassis. Generally, the general chassis of an automobile has multiple accessories, such as a diesel tank, a battery, etc. At present, there is a situation where the leg interferes with the accessories on the chassis in some chassis. Therefore, the leg needs to be made in a form that can be flipped in this case.

[0003] For such tipping legs, there are generally two legs, and it is necessary to switch between the locked state and the unlocked state between the two legs. The existing fixing scheme for the tipping leg is to fix the two legs through two pin shafts. When it is necessary to move one of the legs, one of the pin shafts needs to be completely pulled out to switch from the locked state to the unlocked state. Therefore, the existing fixing scheme for the tipping leg has the defect of inconvenient unlocking. Summary of the Invention

[0004] In view of the above defects or deficiencies, the present invention provides a pin device, aiming to solve the technical problem of inconvenient unlocking of the tipping leg.

[0005] To achieve the above object, the present invention provides a pin device, wherein the pin device includes a bushing and a pin shaft assembly. The bushing is sequentially provided with a first inclined groove and a second inclined groove along the length direction, and the first inclined groove and the second inclined groove are inclined in opposite directions along the circumferential direction of the bushing.

[0006] The pin shaft assembly includes a first pin shaft, a second pin shaft and a reset elastic member. The first pin shaft and the second pin shaft are both inserted into the bushing. Both ends of the first pin shaft and the second pin shaft are respectively provided with a fitting portion and a pin mounting portion, and the fitting portions of the first pin shaft and the second pin shaft respectively form an installation cavity along the circumferential direction by fitting, and the reset elastic member is placed in the installation cavity. A pull rod passing through the first inclined groove and extending out is provided on the first pin shaft, and a limit pin passing through the second inclined groove and extending out is provided on the second pin shaft.

[0007] In an embodiment of the present invention, the fitting portions of the first pin shaft and the second pin shaft are set to be split and fitted, and a stop step surface is formed between the fitting portion and the pin mounting portion of each pin shaft, and the stop step surface can axially stop the fitting portion of the other pin shaft.

[0008] In an embodiment of the present invention, a plurality of fitting teeth are sequentially and spaced apart along the circumferential direction of the fitting portion of each pin shaft, and the fitting teeth of the first pin shaft and the second pin shaft can be alternately inserted and fitted in sequence.

[0009] In an embodiment of the present invention, a guide rod is further provided in the installation cavity, and the guide rod can be sleeved with the reset elastic member.

[0010] In an embodiment of the present invention, a guide rod is provided on the pin mounting portion of one of the first pin shaft and the second pin shaft, a guide hole communicating with the installation cavity is formed on the pin mounting portion of the other of the first pin shaft and the second pin shaft, and the free end of the guide rod is inserted into the guide hole.

[0011] In an embodiment of the present invention, a connecting protrusion is provided on the splicing portion of one of the first pin shaft and the second pin shaft, the connecting protrusion extends along the axial direction of the bushing, and a connecting groove is provided on the other of the first pin shaft and the second pin shaft, and the connecting protrusion is located in the connecting groove.

[0012] In an embodiment of the present invention, the splicing length of the splicing portion of the first pin shaft and the second pin shaft when the reset elastic member elastically elongates is the first splicing length, the splicing length of the splicing portion of the first pin shaft and the second pin shaft when the reset elastic member elastically compresses is the second splicing length, the first splicing length is set to be greater than or equal to 1 / 4 times the second splicing length, and the pull rod is provided on the splicing portion and within the range of the first splicing length.

[0013] In an embodiment of the present invention, an oil injection port is formed on the bushing, and the oil injection port is used to input lubricating oil into the bushing.

[0014] In addition, the present invention further provides a tipping leg, the tipping leg includes a first leg, a second leg, a fixed pin shaft and the plug pin device as described above, the first leg and the second leg are rotatably connected through the fixed pin shaft, the bushing of the plug pin device is provided on the first leg, and a first connection hole through which the pin mounting portion of the pin shaft assembly can pass is formed on the second leg.

[0015] In an embodiment of the present invention, a first mounting seat and a second mounting seat are respectively provided on opposite sides of the first leg, the first mounting seat and the second mounting seat can respectively accommodate the bushing and the fixed pin shaft in a one-to-one correspondence, and the central axes of the fixed pin shaft and the bushing are arranged parallel to each other, a connection seat is provided on the second leg, and a first connection hole and a second connection hole are provided at intervals on the connection seat, and the first connection hole and the second connection hole can respectively accommodate the pin mounting portion and the fixed pin shaft in a one-to-one correspondence.

[0016] In an embodiment of the present invention, the tipping leg further includes a limiting component, the limiting component includes a mounting block and a limiting rod, the mounting block is connected to the first leg, the limiting rod is movably connected to the mounting block, and the limiting rod is used to abut against the second leg.

[0017] In addition, the present invention further provides a crane, and the crane includes the tipping leg as described above.

[0018] By the above technical solutions, the plug pin device provided by the embodiment of the present invention has the following beneficial effects:

[0019] In the technical solution of the present invention, the splicing part of the first pin shaft and the second pin shaft is connected by splicing, so that the first pin shaft can drive the second pin shaft to move. The processing difficulty of the first pin shaft and the second pin shaft is low and they are easy to assemble. During the operation, by pulling the pull rod to move relative to the groove wall of the first inclined groove, the pin-mounted parts of the first pin shaft and the second pin shaft can be retracted into the shaft sleeve, so as to unlock the first leg and the second leg. Moreover, by setting a reset elastic member, the first pin shaft and the second pin shaft can be automatically reset, and the operation is convenient.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings. In the drawings:

[0022] Figure 1 is a schematic structural diagram of the pull rod in the first position in a perspective view of the plug pin device according to an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of the pull rod in the first position in another perspective view of the plug pin device according to an embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of the pull rod in the first position in the plug pin device according to an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of the pull rod in the second position in a perspective view of the plug pin device according to an embodiment of the present invention;

[0026] Figure 5 is a schematic structural diagram of the pull rod in the second position in another perspective view of the plug pin device according to an embodiment of the present invention;

[0027] Figure 6 is a cross-sectional view of the pull rod in the second position in the plug pin device according to an embodiment of the present invention;

[0028] Figure 7 is a schematic cross-sectional view of the splicing of the splicing tooth bodies in the plug pin device according to an embodiment of the present invention;

[0029] Figure 8 is a schematic cross-sectional view of the connection between the connection protrusion and the connection groove in the plug pin device according to an embodiment of the present invention;

[0030] Figure 9 It is a schematic structural diagram of the first leg of the tilting leg according to an embodiment of the present invention;

[0031] Figure 10 It is a schematic structural diagram of a state of the tilting leg according to an embodiment of the present invention;

[0032] Figure 11 It is a schematic structural diagram of another state of the tilting leg according to an embodiment of the present invention.

[0033] Explanation of reference numerals

[0034] 100 Pin device 40 Reset elastic member

[0035] 10 Bush 200 Tilting leg

[0036] 11 First inclined groove 201 First leg

[0037] 12 Second inclined groove 50 First mounting seat

[0038] 13 Oil filling port 51 First mounting plate

[0039] 20 First pin shaft 52 First mounting hole

[0040] 21 Fitting part 60 Second mounting seat

[0041] 211 Connecting protrusion 61 Second mounting plate

[0042] 212 Connecting groove 62 Second mounting hole

[0043] 22 Pin-mounted part 202 Second leg

[0044] 23 Mounting cavity 70 Connecting seat

[0045] 24 Pull rod 71 First connecting hole

[0046] 25 Stopping step surface 72 Second connecting hole

[0047] 26 Guide rod 73 Connecting plate

[0048] 30 Second pin shaft 203 Fixed pin shaft

[0049] 31 Limit pin 204 Limit assembly

[0050] 32 Fitting tooth body 2041 Mounting block

[0051] 33 Guide hole 2042 Limit rod Detailed implementation manner

[0052] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and understanding the present invention, and are not used to limit the present invention.

[0053] The following describes the plug device of the present invention with reference to the accompanying drawings.

[0054] As Figures 1 to 6 shown, it can be understood that Figures 1 to 6 in the dotted line part in

[0055] Please refer to Figure 1 and Figure 1 is a schematic structural diagram of the plug device 100 in a perspective view when the pull rod 24 is in the first position according to an embodiment of the present invention. The sleeve 10 is successively provided with a first inclined groove 11 and a second inclined groove 12 along the length direction, and the first inclined groove 11 and the second inclined groove 12 are inclined in opposite directions along the circumferential direction of the sleeve 10. Among them, the circumferential direction of the sleeve 10 refers to the counterclockwise direction when viewed from the right end of the sleeve 10. That is to say, the first inclined groove 11 and the second inclined groove 12 can be in an "eight" shape.

[0056] Please refer to Figure 2 and Figure 3 and Figure 2 is a schematic structural diagram of the plug device 100 in another perspective view when the pull rod 24 is in the first position according to an embodiment of the present invention, Figure 3 is a cross-sectional view of the plug device 100 when the pull rod 24 is in the first position according to an embodiment of the present invention. The pin shaft assembly includes a first pin shaft 20, a second pin shaft 30 and a reset elastic member 40. The first pin shaft 20 and the second pin shaft 30 are both inserted into the sleeve 10, and the first pin shaft 20 and the second pin shaft 30 are distributed along the axial direction of the sleeve 10. Both ends of the first pin shaft 20 and the second pin shaft 30 are respectively provided with a fitting portion 21 and a pin mounting portion 22, and the fitting portion 21 of the first pin shaft 20 and the respective fitting portions 21 of the second pin shaft 30 are circumferentially fitted to form an installation cavity 23, and the reset elastic member 40 is placed in the installation cavity 23. One end of the reset elastic member 40 abuts against the pin mounting portion 22 of the first pin shaft 20, and the other end of the reset elastic member 40 abuts against the pin mounting portion 22 of the second pin shaft 30. The reset elastic member 40 can generate elastic deformation to push the first pin shaft 20 and the second pin shaft 30 to move.

[0057] A pull rod 24 is provided on the first pin shaft 20 and extends out through the first inclined groove 11, and a limit pin 31 is provided on the second pin shaft 30 and extends out through the second inclined groove 12. The pull rod 24 can slide relative to the first inclined groove 11 between a first position and a second position. Please refer toFigure 1 When the pull rod 24 is in the first position, the pin-mounted portions 22 of the first pin shaft 20 and the second pin shaft 30 both extend out of the bushing 10. At this time, the pin-mounted portions 22 of the first pin shaft 20 and the second pin shaft 30 can lock the first leg 201 and the second leg 202, so that the first leg 201 and the second leg 202 are fixed.

[0058] Please refer to Figures 4 to 6 , Figure 4 is a schematic structural view of the pull rod 24 in the second position of the pin device 100 according to an embodiment of the present invention from a perspective. Figure 5 is a schematic structural view of the pull rod 24 in the second position of the pin device 100 according to an embodiment of the present invention from another perspective. Figure 6 is a cross-sectional view of the pull rod 24 in the second position of the pin device 100 according to an embodiment of the present invention. When the pull rod 24 is in the second position, the pin-mounted portions 22 of the first pin shaft 20 and the second pin shaft 30 are both located within the bushing 10. At this time, the pin-mounted portions 22 of the first pin shaft 20 and the second pin shaft 30 can unlock the first leg 201 and the second leg 202, so that the first leg 201 and the second leg 202 can rotate.

[0059] Specifically, during the process of the pull rod 24 moving from the first position to the second position relative to the groove wall of the first inclined groove 11, the movement of the pull rod 24 drives the first pin shaft 20 to rotate, and the pin-mounted portion 22 of the first pin shaft 20 retracts into the bushing 10. The engaging portion 21 of the first pin shaft 20 abuts against the engaging portion 21 of the second pin shaft 30. The engaging portion 21 of the first pin shaft 20 drives the engaging portion 21 of the second pin shaft 30 to rotate, so that the limit pin 31 can move relative to the groove wall of the second inclined groove 12, thereby enabling the pin-mounted portion 22 of the second pin shaft 30 to retract into the bushing 10. The pin-mounted portions 22 of the first pin shaft 20 and the second pin shaft 30 both retract into the bushing 10, causing the reset elastic member 40 to be compressed. The first inclined groove 11 and the second inclined groove 12 are inclined in opposite directions along the circumferential direction of the bushing 10. Compared with the first inclined groove 11 and the second inclined groove 12 extending along the axial direction of the bushing 10, the movement of the first pin shaft 20 can generate a greater acting force, enabling the first pin shaft 20 to better drive the second pin shaft 30 to rotate, so that the pin-mounted portion 22 of the second pin shaft 30 can retract into the bushing 10.

[0060] During the process of the pull rod 24 moving from the second position to the first position relative to the groove wall of the first inclined groove 11, the reset elastic member 40 elongates, and the elastic force generated by the reset elastic member 40 pushes the pin-mounted portions 22 of the first pin shaft 20 and the second pin shaft 30 to extend out of the bushing 10. The pull rod 24 moves relative to the groove wall of the first inclined groove 11, and the limit pin 31 moves relative to the groove wall of the second inclined groove 12, thereby realizing the automatic reset of the first pin shaft 20 and the second pin shaft 30.

[0061] In the bolt device 100 in the present application, the splicing part 21 of the first pin shaft 20 and the second pin shaft 30 is connected by splicing, so that the first pin shaft 20 can drive the second pin shaft 30 to move. The processing difficulty of the first pin shaft 20 and the second pin shaft 30 is low and it is easy to assemble. During the operation process, by pulling the pull rod 24 to move relative to the groove wall of the first inclined groove 11, the pin-mounted parts 22 of the first pin shaft 20 and the second pin shaft 30 can be retracted into the shaft sleeve 10, unlocking the first leg 201 and the second leg 202. Moreover, by setting the reset elastic member 40, the first pin shaft 20 and the second pin shaft 30 can be automatically reset, which is convenient for operation.

[0062] Specifically, the first inclined groove 11 and the second inclined groove 12 are symmetrically arranged, so that the pull rod 24 and the limit pin 31 can move synchronously.

[0063] In the embodiment of the present invention, please refer to Figure 4 , the splicing part 21 of the first pin shaft 20 and the second pin shaft 30 is set to be spliced in half. That is to say, the splicing part 21 of the first pin shaft 20 and the splicing part 21 of the second pin shaft 30 can be semi-cylindrical, reducing the processing difficulty and assembly difficulty of the first pin shaft 20 and the second pin shaft 30 and facilitating assembly. And a stop step surface 25 is formed between the splicing part 21 and the pin-mounted part 22 of each pin shaft. The stop step surface 25 can axially stop the splicing part 21 of the other pin shaft to limit the movement of the pull rod 24 from the first position to the second position, improving the reliability of the movement process of the first pin shaft 20 and the second pin shaft 30.

[0064] In the embodiment of the present invention, please refer to Figure 7 , Figure 7 is a schematic cross-sectional view of the splicing of the splicing teeth 32 in the bolt device 100 according to an embodiment of the present invention. A plurality of splicing teeth 32 are sequentially arranged at intervals along the circumferential direction of the splicing part 21 of each pin shaft, and the splicing teeth 32 of the first pin shaft 20 and the second pin shaft 30 can be sequentially inserted and spliced alternately. As Figure 7 shown, two splicing teeth 32 are sequentially arranged at intervals along the circumferential direction of the splicing part 21 of the first pin shaft 20. Each splicing tooth 32 can be 1 / 4 cylindrical. The splicing part 21 of the second pin shaft 30 is the same as that of the first pin shaft 20. The splicing teeth 32 of the first pin shaft 20 and the second pin shaft 30 can be sequentially inserted and spliced alternately. By arranging two splicing teeth 32 on the splicing part 21 of each pin shaft, the contact area between the first pin shaft 20 and the second pin shaft 30 is increased, and the first pin shaft 20 can drive the second pin shaft 30 to move better. In other embodiments, three, four or other numbers of splicing teeth 32 can be arranged on the splicing part 21 of each pin shaft. The number of splicing teeth 32 can be flexibly adjusted according to actual needs. The present application does not limit the specific number of splicing teeth 32.

[0065] In an embodiment of the present invention, please refer to Figure 6 Inside the installation cavity 23, a guide rod 26 is further provided. The guide rod 26 can be sleeved with the reset elastic member 40. The guide rod 26 extends along the axial direction of the bushing 10. The guide rod 26 guides the deformation of the reset elastic member 40. By providing the guide rod 26, the reliability of the deformation of the reset elastic member 40 is improved, thereby improving the reliability of the movement of the first pin shaft 20 and the second pin shaft 30.

[0066] Specifically, the reset elastic member 40 can be a spring, and the spring has the advantages of easy material acquisition and convenient installation. In other embodiments, the reset elastic member 40 can also be an elastic sleeve or other elastic members, as long as the reset elastic member 40 can undergo elastic deformation.

[0067] Furthermore, please refer to Figure 3 On the pin mounting portion 22 of one of the first pin shaft 20 and the second pin shaft 30, a guide rod 26 is provided. On the pin mounting portion 22 of the other of the first pin shaft 20 and the second pin shaft 30, a guide hole 33 communicating with the installation cavity 23 is formed. The free end of the guide rod 26 penetrates into the guide hole 33.

[0068] As Figure 3 shown, on the pin mounting portion 22 of the first pin shaft 20, a guide rod 26 is provided, and the guide rod 26 moves together with the first pin shaft 20. The guide rod 26 is connected to the pin mounting portion 22 of the first pin shaft 20 to fix the guide rod 26. The guide rod 26 and the first pin shaft 20 can be integrally formed, saving the installation steps of the guide rod 26 and the first pin shaft 20 and reducing the assembly error between the guide rod 26 and the first pin shaft 20. The guide rod 26 and the first pin shaft 20 can also be separately provided, which is convenient for replacing the guide rod 26 after wear and improves the flexibility of use of the guide rod 26. On the pin mounting portion 22 of the second pin shaft 30, a guide hole 33 is formed. The guide hole 33 extends along the axial direction of the bushing 10. The guide hole 33 is communicated with the installation cavity 23. The free end of the guide rod 26 penetrates into the guide hole 33. The guide hole 33 guides the movement of the guide rod 26 along the axial direction of the bushing 10, improving the reliability of the movement of the guide rod 26. During the movement of the pull rod 24 from the first position to the second position, the free end of the guide rod 26 is always located in the guide hole 33, preventing the guide rod 26 from disengaging from the guide hole 33 and interfering with or obstructing the movement of the first pin shaft 20 and the second pin shaft 30, and at the same time preventing the guide rod 26 from being difficult to insert into the guide hole 33 again after disengaging from the guide hole 33.

[0069] In another embodiment, it can also be that a guide rod 26 is provided on the pin mounting portion 22 of the second pin shaft 30, and a guide hole 33 is formed on the pin mounting portion 22 of the first pin shaft 20.

[0070] In an embodiment of the present invention, please refer to Figure 8 , Figure 8It is a schematic cross-sectional view showing the connection between the connection protrusion 211 and the connection groove 212 in the bolt device 100 according to an embodiment of the present invention. A connection protrusion 211 is provided on the fitting portion 21 of one of the first pin shaft 20 and the second pin shaft 30. The connection protrusion 211 extends along the axial direction of the bushing 10. The other of the first pin shaft 20 and the second pin shaft 30 is provided with a connection groove 212, and the connection protrusion 211 is located within the connection groove 212.

[0071] As Figure 8 shown, a connection protrusion 211 is provided on the fitting portion 21 of the first pin shaft 20, and the second pin shaft 30 is provided with a connection groove 212. The connection protrusion 211 extends along the axial direction of the bushing 10, and the connection protrusion 211 is located within the connection groove 212. By providing the cooperation between the connection protrusion 211 and the connection groove 212, the cooperation between the fitting portions 21 of the first pin shaft 20 and the second pin shaft 30 becomes closer, and the first pin shaft 20 can drive the second pin shaft 30 to move better. During the process of the first pin shaft 20 driving the second pin shaft 30 to move, the connection protrusion 211 can slide axially along the wall of the connection groove 212 relative to the bushing 10.

[0072] In another embodiment, it may also be that a connection protrusion 211 is provided on the fitting portion 21 of the second pin shaft 30, and the first pin shaft 20 is provided with a connection groove 212.

[0073] In the embodiment of the present invention, please refer to Figure 3 , the fitting length of the fitting portions 21 of the first pin shaft 20 and the second pin shaft 30 when the reset elastic member 40 is elastically elongated is the first fitting length L1, and the fitting length of the fitting portions 21 of the first pin shaft 20 and the second pin shaft 30 when the reset elastic member 40 is elastically compressed is the second fitting length L2. The first fitting length is set to be greater than or equal to 1 / 4 times the second fitting length. If the first fitting length is less than 1 / 4 times the second fitting length, then when the reset elastic member 40 is elastically elongated, the fitting length of the fitting portions 21 of the first pin shaft 20 and the second pin shaft 30 is too small, resulting in too small a contact area between the first pin shaft 20 and the second pin shaft 30, thereby making it difficult for the first pin shaft 20 to drive the second pin shaft 30 to move. Therefore, setting the first fitting length to be greater than or equal to 1 / 4 times the second fitting length can improve the reliability of the first pin shaft 20 driving the second pin shaft 30 to move.

[0074] The pull rod 24 is provided on the fitting portion 21 and is within the range of the first fitting length. That is to say, when the reset elastic member 40 is elastically elongated, the pull rod 24 is within the range where the fitting portions 21 of the first pin shaft 20 and the second pin shaft 30 are fitted, so that the force received by the pull rod 24 can be more effectively transmitted to the fitting portion 21 of the second pin shaft 30, further improving the reliability of the first pin shaft 20 driving the second pin shaft 30 to move.

[0075] In an embodiment of the present invention, please refer to Figure 9 , Figure 9 which is a schematic structural diagram of the first leg 201 in the flipping leg 200 according to an embodiment of the present invention. An oil injection port 13 is provided on the bushing 10, and the oil injection port 13 is used to input lubricating oil into the bushing 10. By providing the oil injection port 13 to input lubricating oil into the bushing 10, the resistance is reduced, making the movement of the first pin 20 and the second pin 30 smoother.

[0076] In addition, the present invention also provides a flipping leg 200. Please refer to Figure 10 and Figure 11 , Figure 10 which is a schematic structural diagram of a state of the flipping leg 200 according to an embodiment of the present invention, Figure 11 and Figure 11 which is a schematic structural diagram of another state of the flipping leg 200 according to an embodiment of the present invention. The flipping leg 200 includes a first leg 201, a second leg 202, a fixed pin 203, and the pin insertion device 100 as described above. Since the flipping leg 200 adopts all the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated herein one by one.

[0077] The first leg 201 is rotatably connected to the second leg 202 through the fixed pin 203, and the first leg 201 and the second leg 202 can rotate around the fixed pin 203. The bushing 10 of the pin insertion device 100 is provided on the first leg 201, and a first connection hole 71 through which the pin-mounted part 22 of the pin shaft assembly can pass is formed on the second leg 202. When the pin-mounted part 22 of the pin shaft assembly extends out of the bushing 10 and passes through the first connection hole 71, the pin-mounted part 22 of the pin shaft assembly can lock the first leg 201 and the second leg 202, making the first leg 201 and the second leg 202 fixed. When the pull rod 24 is pulled to make the pin-mounted part 22 of the pin shaft assembly retract into the bushing 10, the pin-mounted part 22 of the pin shaft assembly can unlock the first leg 201 and the second leg 202, making the first leg 201 and the second leg 202 rotatable.

[0078] In an embodiment of the present invention, please refer to Figure 9 , on opposite sides of the first leg 201, a first mounting seat 50 and a second mounting seat 60 are respectively provided. The first mounting seat 50 and the second mounting seat 60 can be respectively provided with the bushing 10 and the fixed pin 203 in a one-to-one correspondence. The first mounting seat 50 includes two first mounting plates 51, and first mounting holes 52 are provided on the first mounting plates 51. Both ends of the bushing 10 are respectively located in the two first mounting holes 52. The second mounting seat 60 includes two second mounting plates 61, and second mounting holes 62 are provided on the second mounting plates 61. Both ends of the fixed pin 203 are respectively located in the two second mounting holes 62.

[0079] The central axes of the fixed pin shaft 203 and the bushing 10 are arranged parallel to each other, facilitating the rotation of the first leg 201 and the second leg 202. Moreover, the central axes of the fixed pin shaft 203 and the bushing 10 can be arranged at intervals in the up-and-down direction, facilitating the rotation of the first leg 201 and the second leg 202.

[0080] Please refer to Figure 10 and Figure 11 On the second leg 202, there is a connecting seat 70. On the connecting seat 70, a first connecting hole 71 and a second connecting hole 72 are arranged at intervals. The first connecting hole 71 and the second connecting hole 72 can be penetrated by the pinning part 22 and the fixed pin shaft 203 in one-to-one correspondence. The pinning part 22 passes through the first connecting hole 71, enabling the pinning part 22 to lock or unlock the second leg 202. The fixed pin shaft 203 passes through the second connecting hole 72, enabling the second leg 202 to rotate around the fixed pin shaft 203.

[0081] The connecting seat 70 may include two connecting plates 73. On the connecting plates 73, the first connecting hole 71 and the second connecting hole 72 are arranged at intervals. The two connecting plates 73 are respectively located on the two axial sides of the fixed pin shaft 203. By arranging the two connecting plates 73, the connection between the connecting seat 70 and the fixed pin shaft 203 is made more stable. At the same time, the connection between the connecting seat 70 and the pinning part 22 is also made more stable, enhancing the structural stability.

[0082] In the embodiment of the present invention, please continue to refer to Figure 10 and Figure 11 The flipping leg 200 further includes a limiting component 204. The limiting component 204 includes a mounting block 2041 and a limiting rod 2042. The mounting block 2041 is connected to the first leg 201 to fix the mounting block 2041. The limiting rod 2042 is movably connected to the mounting block 2041. The limiting rod 2042 is used to abut against the second leg 202. By arranging the limiting rod 2042 to abut against the second leg 202, the rotation range of the first leg 201 is restricted. Moreover, since the limiting rod 2042 is movably connected to the mounting block 2041, the position of the limiting rod 2042 can be adjusted according to actual needs to adjust the rotation range of the first leg 201.

[0083] Specifically, the limiting rod 2042 can be threadedly connected to the mounting block 2041. Threaded connection can achieve self-locking, and the position of the limiting rod 2042 can be adjusted very conveniently. In other embodiments, the limiting rod 2042 and the mounting block 2041 can be movably connected by other means, such as a slider-rail structure.

[0084] In addition, the present invention further provides a crane, which includes the tipping leg 200 as described above. Since the crane adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0085] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0086] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0088] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A latch device, characterized in that, The plug device (100) includes: A bushing (10), the bushing (10) is sequentially provided with a first inclined groove (11) and a second inclined groove (12) along the length direction, and the first inclined groove (11) and the second inclined groove (12) are inclined in opposite directions along the circumferential direction of the bushing (10); A pin shaft assembly, including a first pin shaft (20), a second pin shaft (30) and a reset elastic member (40), the first pin shaft (20) and the second pin shaft (30) are both disposed within the bushing (10), both ends of the first pin shaft (20) and the second pin shaft (30) are respectively provided with a fitting portion (21) and a pin mounting portion (22), and the fitting portions (21) of the first pin shaft (20) and the second pin shaft (30) are circumferentially fitted to form a mounting cavity (23), the reset elastic member (40) is placed within the mounting cavity (23), a pull rod (24) passing through the first inclined groove (11) and extending out is provided on the first pin shaft (20), and a limit pin (31) passing through the second inclined groove (12) and extending out is provided on the second pin shaft (30).

2. The plug device according to claim 1, characterized in that, The fitting portions (21) of the first pin shaft (20) and the second pin shaft (30) are provided to be split and fitted, and a stop step surface (25) is formed between the fitting portion (21) and the pin mounting portion (22) of each pin shaft, and the stop step surface (25) can axially stop the fitting portion (21) of the other pin shaft.

3. The plug device according to claim 1, wherein, A plurality of fitting teeth (32) are sequentially and circumferentially spaced on the fitting portion (21) of each pin shaft, and the fitting teeth (32) of the first pin shaft (20) and the second pin shaft (30) can be sequentially and alternately inserted and fitted.

4. The plug device according to claim 1, characterized in that, A guide rod (26) is further provided within the mounting cavity (23), and the reset elastic member (40) can be sleeved on the guide rod (26).

5. The plug device according to claim 4, characterized in that, The guide rod (26) is provided on the pin mounting portion (22) of one of the first pin shaft (20) and the second pin shaft (30), a guide hole (33) communicating with the mounting cavity (23) is formed on the pin mounting portion (22) of the other of the first pin shaft (20) and the second pin shaft (30), and the free end of the guide rod (26) is inserted within the guide hole (33).

6. The plug device according to claim 1, characterized in that A connecting protrusion (211) is provided on the fitting portion (21) of one of the first pin shaft (20) and the second pin shaft (30), the connecting protrusion (211) extends along the axial direction of the bushing (10), a connecting groove (212) is provided on the other of the first pin shaft (20) and the second pin shaft (30), and the connecting protrusion (211) is located within the connecting groove (212).

7. The latch device according to any one of claims 1 to 6, characterized in that, The fitting length of the fitting part (21) of the first pin shaft (20) and the second pin shaft (30) when the reset elastic member (40) elastically elongates is the first fitting length, and the fitting length of the fitting part (21) of the first pin shaft (20) and the second pin shaft (30) when the reset elastic member (40) elastically compresses is the second fitting length. The first fitting length is set to be greater than or equal to 1 / 4 times the second fitting length. The pull rod (24) is arranged on the fitting part (21) and within the range of the first fitting length; And / or, an oil injection port (13) is provided on the bushing (10), and the oil injection port (13) is used to input lubricating oil into the bushing (10).

8. A flip leg, characterized in that, The tipping leg (200) includes a first leg (201), a second leg (202), a fixed pin shaft (203), and the pin insertion device (100) according to any one of claims 1 to 7. The first leg (201) and the second leg (202) are rotatably connected through the fixed pin shaft (203). The bushing (10) of the pin insertion device (100) is arranged on the first leg (201), and a first connection hole (71) through which the pinning part (22) of the pin shaft assembly can pass is formed on the second leg (202).

9. The turnover support leg according to claim 8, wherein, On opposite sides of the first leg (201), a first mounting seat (50) and a second mounting seat (60) are respectively provided. The first mounting seat (50) and the second mounting seat (60) can respectively accommodate the bushing (10) and the fixed pin shaft (203) in a one-to-one correspondence, and the central axes of the fixed pin shaft (203) and the bushing (10) are arranged parallel to each other. A connection seat (70) is provided on the second leg (202), and the first connection hole (71) and the second connection hole (72) are provided on the connection seat (70) at intervals. The first connection hole (71) and the second connection hole (72) can respectively accommodate the pinning part (22) and the fixed pin shaft (203) in a one-to-one correspondence; And / or, the tipping leg (200) further includes a limiting component (204). The limiting component (204) includes a mounting block (2041) and a limiting rod (2042). The mounting block (2041) is connected to the first leg (201), and the limiting rod (2042) is movably connected to the mounting block (2041). The limiting rod (2042) is used to abut against the second leg (202).

10. A crane, characterized in that, The crane includes the tipping leg (200) according to any one of claims 8 to 9.

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