Engine crane

Abstract

The present invention relates to the technical field of lifting equipment, and it relates to an engine crane, which includes a base, a column, a boom and a hydraulic cylinder. The base includes a mounting unit and two supporting feet, and the supporting feet are detachably connected to the mounting unit. The two supporting feet are arranged on both sides of the mounting unit. The column is detachably connected to the mounting unit. A docking portion for connecting one end of the boom is provided on the end of the column. The boom is connected to the docking portion at one end, and a hook is provided on the other end. The lower end of the hydraulic cylinder is rotatably connected to the column, and the upper end of the hydraulic cylinder is rotatably connected to the boom. An auxiliary bracket is also provided between the boom and the column. The auxiliary bracket facilitates the boom to support the boom when it is driven upward by the hydraulic cylinder. The present invention facilitates operators to quickly disassemble the crane, and is convenient for storage and transportation. At the same time, this design enables the crane to flexibly adjust its configuration according to different needs during actual maintenance, ensuring the high adaptability and versatility of the crane.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and more particularly to a crane for an engine. Background Art

[0002] Automobile maintenance is the process of troubleshooting and repairing a faulty automobile through professional technical means, with the goal of restoring the normal performance and safety of the vehicle. Automobile maintenance is mainly divided into two categories: major repairs and minor repairs. Major repairs refer to restoring the technical condition of the automobile by replacing or repairing its parts (including basic parts) and extending the service life of the automobile. Minor repairs refer to routine maintenance and partial repairs of the vehicle.

[0003] During car maintenance, engine failure is a common problem. Especially when repairing or replacing engine-related parts, the engine often needs to be removed from the car body. In order to facilitate this operation, an engine hanger is usually used to lift the engine.

[0004] For example, a foldable portable hydraulic crane disclosed in application publication number CN109292638A has the problem that the hydraulic cylinder of the crane is easily damaged after a long time, and the boom is too long, causing bending and deformation under stress. Based on this technical problem, an easily adjustable engine repair hanger with publication number CN113264454B solves the problem that the existing equipment exerts too much pressure on the hydraulic cylinder during use, the hydraulic cylinder is easily damaged after a long time, and the boom is too long, causing bending and deformation under stress.

[0005] However, the easily adjustable repair engine hanger (CN113264454B) has solved the problems of excessive pressure in the hydraulic cylinder and bending deformation of the long boom. Although this design has achieved certain results in improving the safety of use and the durability of the equipment, its complex structure has increased the manufacturing cost and difficulty of use of the hanger. The complex structural design not only makes the assembly and maintenance of the equipment more cumbersome, but also makes the hanger inconvenient to operate during actual use, reducing its universality in actual automobile maintenance. Summary of the invention

[0006] To this end, the present invention provides an engine crane, which improves the operating experience of maintenance personnel by simplifying the structure and boom design.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An engine crane, comprising:

[0009] The base comprises a mounting unit and two supporting feet, wherein the supporting feet and the mounting unit are detachably connected, and the two supporting feet are arranged on both sides of the mounting unit.

[0010] The column is detachably connected to the mounting unit, and the end of the column is provided with a docking portion for connecting one end of the boom.

[0011] The boom has one end connected to the docking part and the other end provided with a hook.

[0012] The column is also connected to a hydraulic cylinder, the lower end of the hydraulic cylinder is rotatably connected to the column, and the upper end of the hydraulic cylinder is rotatably connected to the boom.

[0013] An auxiliary bracket is also provided between the boom and the column, and the auxiliary bracket is convenient for supporting the boom when the boom is driven by the hydraulic cylinder to be lifted upward.

[0014] The present invention is further configured as follows: two symmetrically disposed upper hanging members are disposed on the outer peripheral wall of the suspension arm, and a first movable opening is formed on the end of the upper hanging member.

[0015] The outer peripheral wall of the column is provided with two symmetrical hanging parts, and the ends of the hanging parts are provided with a second movable opening.

[0016] The two ends of the auxiliary bracket are rotatably connected to the first movable opening and the second movable opening respectively.

[0017] The present invention is further configured as follows: the auxiliary bracket includes a first swing arm and a second swing arm, the head end of the first swing arm is movably connected to the head end of the second swing arm, the end of the first swing arm is movably connected to the first movable opening, and the end of the second swing arm is movably connected to the second movable opening.

[0018] The first end of the first swing arm and the second swing arm are commonly connected with a docking plate, on which two shafts are arranged, and the first end of the first swing arm and the second swing arm are sleeved on the shafts and rotatably connected with the shafts.

[0019] The present invention is further configured as follows: convex teeth are provided on the outer peripheral walls of the first and second swing arms, and the convex teeth on the first and second swing arms are meshed with each other.

[0020] The present invention is further configured as follows: guide grooves are provided on both side walls of the installation unit, two limit rings are provided on the outer sides of the guide grooves, a placement station is formed between the limit rings and the guide grooves for the support legs to extend into, a positioning hole is provided on the limit rings, and a locking screw is connected to the positioning hole for squeezing the support legs.

[0021] The present invention is further configured as follows: a positioning plate is provided on the end of the supporting leg, a work station hole is opened on the upper end face of the positioning plate, a socket is opened on the limiting ring close to the positioning plate, a caster mounting plate is inserted into the socket, the caster mounting plate is pressed on the upper edge of the positioning plate, and a docking hole connected to the work station hole is opened on the caster mounting plate, and the docking hole and the work station hole are connected by screws.

[0022] The present invention is further configured as follows: the caster mounting plate is provided with a rear caster, the two rear casters are further connected via a traction plate, the traction plate is placed below the mounting unit, and the head end of the supporting foot is provided with a front caster.

[0023] The present invention is further configured as follows: a movable channel is opened on the upper hanging member, the movable channel runs through its body and is connected to the first movable opening, a locking structure is movably connected in the movable channel, the locking structure includes a piston rod, a positioning rod and an extrusion end, the extrusion end is connected to one end of the piston rod, and the other end of the piston rod extends out of the movable channel, and the piston rod presses against the extrusion end and collides with the end of the first swing arm.

[0024] The present invention is further configured as follows: a guide cylinder is provided on the outer side wall of the upper hanging member, a guide hole connected to the movable channel is provided in the guide cylinder, and the guide hole and the movable channel are in a vertical relationship.

[0025] The positioning rod and the guide hole are movably connected, a first spring is sleeved on the positioning rod, a slot body is provided at the end of the positioning rod, the diameter of the slot body is larger than the diameter of the positioning rod, and the two ends of the first spring respectively contact the top of the guide hole and the slot body.

[0026] The piston rod comprises a thick rod portion and a thin rod portion, a second spring is sleeved on the thin rod portion, and two ends of the second spring respectively contact the thick rod portion and the top wall of the active channel.

[0027] The thick rod portion is provided with an annular groove matched with the drop trough body.

[0028] The present invention is further configured as follows: a card case is detachably connected to the head ends of the first swing arm and the second swing arm, a protruding tooth is arranged on the inner wall of the card case, and two U-shaped openings are opened on the side wall of the card case.

[0029] Compared with the shortcomings of the prior art, the beneficial effects of the present invention are:

[0030] All parts such as the base, column, boom and support feet are detachably connected, so operators can quickly disassemble the crane when needed for easy storage and transportation. At the same time, this design allows the crane to be flexibly adjusted according to different needs during the actual maintenance process, ensuring the crane's high adaptability and versatility.

[0031] In particular, an auxiliary bracket is added between the boom and the column to effectively support the boom and prevent the boom from excessive tilting or deformation under the drive of the hydraulic cylinder. Through this design, the stability of the crane is greatly enhanced, ensuring that there will be no structural damage or boom deformation caused by mechanical imbalance during long-term operation, and improving safety during maintenance.

[0032] In particular, the setting of the auxiliary support prevents damage to the hydraulic cylinder due to excessive pressure and prolongs the service life of the equipment. This optimized design greatly improves the durability of the crane and reduces the failure rate and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the initial state of the present invention;

[0034] Figure 2 This is a schematic diagram of the first state of the present invention;

[0035] Figure 3 It is a schematic diagram of the second state of the present invention;

[0036] Figure 4 It is a partial explosion schematic diagram of the present invention;

[0037] Figure 5 It is a cross-sectional view of the boom of the present invention.

[0038] Base 1, column 2, boom 3, hydraulic cylinder 4, mounting unit 11, positioning plate 111, supporting foot 12, limiting ring 13, guide groove 10, caster mounting plate 5, rear caster 51, front caster 52, traction plate 53, hook 31, upper hanging part 6, lower hanging part 7, auxiliary bracket 8, first swing arm 81, second swing arm 82, docking plate 83, shaft rod 831, first movable opening 60, second movable opening 70, jam shell 9, U-shaped mouth 90, piston rod 61, positioning rod 62, extrusion end 63, first spring 64, second spring 65, movable channel 601, guide cylinder 66, annular groove 610, drop trough body 621, head end 801, tail end 802, convex tooth 91. DETAILED DESCRIPTION

[0039] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0041] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] refer to Figure 1-Figure 4 The engine crane provided in the first embodiment of the present invention specifically comprises: a base 1, a column 2, a boom 3 and a hydraulic cylinder 4.

[0044] The base 1 includes a mounting unit 11 and two support legs 12 located on both sides thereof. Guide grooves 10 are provided on the two side walls of the mounting unit 11, and a limiting ring 13 is located outside the guide groove 10. A space is formed between the limiting ring 13 and the guide groove 10, and the support legs 12 can be inserted into the space and positioned and adjusted through the space.

[0045] An oil tank for supplying hydraulic oil to the hydraulic cylinder 4 and a hydraulic handle for controlling the operation of the hydraulic cylinder 4 are installed on the installation unit 11 .

[0046] When the position of the support leg 12 needs to be adjusted, the positioning hole and the locking screw provided on the limiting collar 13 can be used to squeeze and fix the support leg 12 by tightening the locking screw. In this way, the extension length and position of the support leg 12 can be flexibly adjusted to meet the stability requirements in different working scenarios.

[0047] A positioning plate 111 is provided at the end of the supporting foot 12, and a workstation hole is provided on the upper end surface thereof. A socket is provided on the limiting collar 13 near the positioning plate, and the caster placement plate 5 inserted into the socket is close to the upper edge of the positioning plate, and a docking hole communicating with the workstation hole is provided on the caster placement plate 5. The docking hole is connected to the workstation hole by screws, and the caster placement plate 5 is fixed to the positioning plate.

[0048] The support leg 12 is a hollow circular tube structure and is divided into two sections, one section being inclined and bent relative to the other section. Such a design facilitates maintaining sufficient strength and improving flexibility during load bearing and movement.

[0049] The caster placement plate 5 is provided with a rear caster 51, and the two rear casters 51 are connected by a traction plate 53, which is placed under the mounting unit 11, which helps to improve the stability and controllability of the base 1 when it moves on the ground. At the same time, a front caster 52 is also provided at the head end of the support foot 12, which together with the rear caster 51 forms a support that contacts the ground at multiple points, making the crane more flexible and stable when moving and positioning.

[0050] The column 2 is fixed to the mounting unit 11 through its bottom mounting plate, so as to transmit the vertical support to the base 1. A docking portion is provided on the upper part of the column 2, and the docking portion is a U-shaped opening structure, which is used to connect with one end of the boom 3 through a pin shaft to realize the rotation and adjustment of the boom 3 in the vertical plane.

[0051] The other end of the boom 3 is provided with a hook 31 for hanging a chain. The chain can hang the engine or other heavy objects to be hoisted. The boom 3 is driven by the hydraulic cylinder 4 to rotate up and down, thereby achieving the purpose of lifting or lowering the engine.

[0052] The lower end of the hydraulic cylinder 4 is rotatably connected to the column 2, and the upper end is rotatably connected to the boom 3. When the hydraulic cylinder 4 is compressed to produce expansion and contraction, the boom 3 can be pushed to rotate upward or downward.

[0053] Under the action of the hydraulic cylinder 4, the boom 3 is raised to drive the chain and the hook 31 to lift the heavy object. When the boom 3 is lowered, the heavy object can be smoothly lowered to the specified position. The use of the hydraulic cylinder 4 can greatly reduce the intensity of manual operation and ensure the stability and safety of the lifting process.

[0054] Two symmetrically distributed upper hanging parts 6 are welded to the boom 3 , and two symmetrically distributed lower hanging parts 7 are welded to the column 2 .

[0055] A first movable opening 60 is provided at the end of the upper hanging member 6 for rotationally connecting the end 802 of the first swing arm 81. The two side walls of the first movable opening 60 are provided with holes connected thereto. A matching hole matching the hole is provided at the end of the first swing arm 81. The first swing arm 81 is combined with the upper hanging member 6 through the pin shaft through hole, the first movable opening 60 and the matching hole, thereby realizing the first swing arm 81 being able to rotate relative to the upper hanging member 6.

[0056] Similar to the above structure, a second movable opening 70 is provided at the end of the pendant member 7, and holes are also provided on the two side walls of the second movable opening 70 that are connected thereto. An adapting hole that matches the hole is provided at the end of the second swing arm 82, and the second swing arm 82 is combined with the pendant member 7 through the pin shaft through hole, the second movable opening 70 and the matching hole, thereby realizing the second swing arm 82 being able to rotate relative to the pendant member 7.

[0057] Through these two rotation connection points, the auxiliary bracket 8 forms a balanced supporting structure between the boom 3 and the column 2 .

[0058] The auxiliary bracket 8 is composed of two swing arms, namely a first swing arm 81 and a second swing arm 82. The head ends of the swing arms are movably connected together through a docking plate 83. The docking plate 83 has two shafts 831, and the head ends 801 of the first swing arm 81 and the second swing arm 82 are respectively mounted on the shafts 831 and can rotate around the shafts 831. This allows the head ends 801 of the two swing arms to move relative to each other and to be kept in the same plane or the same reference through the shafts 831.

[0059] It is worth noting that the outer peripheral walls of the head ends 801 of the first swing arm 81 and the second swing arm 82 are both provided with convex teeth, which mesh with each other. In other words, when one swing arm rotates, the convex teeth at its head end will drive the convex teeth of the other swing arm to rotate synchronously, thereby ensuring that the two swing arms remain synchronized when the angles change, and the situation where one side of the swing arm moves alone will not occur.

[0060] When the boom 3 is driven by the hydraulic cylinder 4 to lift upward, the relative angle between the upper pendant 6 and the lower pendant 7 also changes due to the change in the relative position between the boom 3 and the column 2. The two ends of the auxiliary bracket 8 are respectively connected to the movable openings of the upper and lower pendant parts. When the boom 3 rises, the first swing arm 81 and the second swing arm 82 will rotate relative to each other.

[0061] During this process, the convex teeth at the head end of the swing arm mesh with each other to ensure that the two swing arms rotate synchronously, and no swing arm changes its inclination angle significantly. In this way, the auxiliary bracket 8 provides a relatively balanced support force during the lifting process of the boom 3. As a result, the auxiliary bracket 8 is adjusted synchronously with the angle of the boom 3, so that the boom 3 can still obtain additional support and stability at different heights and angles.

[0062] When the boom 3 is heavily loaded or tends to shake, the auxiliary bracket 8 provides support for the boom 3 by synchronously extending or contracting the two swing arms, converting the local stress state into a more stable stress structure. Through the rotation connection point of the first movable opening 60 and the second movable opening 70, the bracket can adapt to the angle change of the boom 3, thereby preventing the boom 3 from excessively sinking or swinging under certain working conditions. At the same time, the convex tooth meshing ensures that when the swing arms change angles, the two swing arms move in a coordinated manner, reducing the possibility of asymmetric stress.

[0063] In addition, a card shell 9 can be provided outside the connection of the first end 801 of the first swing arm 81 and the second swing arm 82. The card shell 9 is made of plastic, and a convex tooth is provided on the inner wall of the card shell 9. Two U-shaped openings 90 are provided on the side wall of the card shell 9. During use, the card shell 9 is inserted from the outside of the docking plate 83, and the two U-shaped openings 90 are inserted into the shaft 831 on the outside of the docking plate 83 for fixing. The convex teeth 91 inside the card shell 9 just get stuck with the convex teeth on the first ends of the first swing arm 81 and the second swing arm 82, so that a mechanical lock is formed between the first swing arm 81 and the second swing arm 82, which significantly improves the locking stability of the auxiliary bracket 8. The mechanical engagement of the convex teeth can effectively prevent the swing arm from accidentally rotating and loosening under high load or dynamic load.

[0064] like Figure 5 It shows that a horizontally penetrating movable channel 601 is opened in the upper hanging member 6, and the movable channel 601 is communicated with the first movable opening 60, and is used to accommodate and guide the locking structure, which includes a piston rod 61, a positioning rod 62 and an extrusion end 63.

[0065] The piston rod 61 is arranged in a horizontal direction, and one end is connected to the extrusion end 63 for applying force to push outward against the end of the first swing arm 81 of the auxiliary bracket 8, thereby locking the position of the connection of the first swing arm 81.

[0066] A guide cylinder 66 is provided on the outer side wall of the upper hanging member. A guide hole communicating with the movable channel 601 is provided in the guide cylinder 66 . The guide hole and the movable channel 601 are in a vertical relationship.

[0067] The positioning rod 62 is arranged in a vertical direction, and cooperates with the guide cylinder 66 through the guide hole. A first spring 64 is sleeved on the positioning rod 62 .

[0068] The piston rod 61 is divided into a thick rod portion and a thin rod portion. A second spring 65 is sleeved on the thin rod portion. The diameter of the thick rod portion is greater than that of the thin rod portion.

[0069] The first spring 64 is sleeved on the positioning rod 62. The lower end of the positioning rod 62 is connected to the drop groove body 621, and the diameter of the drop groove body 621 is larger than the diameter of the positioning rod 62. The first spring 64 is located in the guide hole, one end of which supports the top of the guide hole, and the other end of which is against the drop groove body 621.

[0070] This arrangement allows the positioning rod 62 to have a certain elastic displacement in the vertical direction. When the positioning rod 62 is subjected to external force or structural changes, it will automatically reset under the action of the spring, and lock or unlock through the cooperation of the drop groove body 621 and the annular groove 610.

[0071] The second spring 65 is sleeved on the thin rod portion of the piston rod 61 and is located in the movable channel 601. When the two ends of the second spring 65 respectively abut against the thick rod portion and the top wall of the movable channel 601, the piston rod 61 will generate a stable horizontal top force under the action of the spring, pushing the extrusion end 63 to the end of the first swing arm 81.

[0072] The thick rod portion is provided with an annular groove 610, and the size of the groove body 621 is larger than the diameter of the positioning rod 62. The purpose of the matching between the groove body 621 and the annular groove 610 is that when the positioning rod 62 is in a specific position under the action of the first spring 64, the groove body 621 can be engaged or aligned with the annular groove 610, thereby forming a "locking" state.

[0073] In short, this structure ensures that when the piston rod 61 pushes out the extrusion end 63, the elastic force and structural positioning of the positioning rod 62 in the vertical direction will keep the piston rod 61 in a stable working position.

[0074] When the boom 3 rises or the position of the auxiliary bracket 8 needs to be fixed, the external force guides the piston rod 61 to push the extrusion end 63 outward, so that it presses against the end of the first swing arm 81, generating radial support force. In this process, the second spring 65 provides continuous pressure to make the extrusion end 63 close to the end of the first swing arm 81 and will not loosen easily. At the same time, the positioning rod 62 floats up and down in the guide hole under the action of the first spring 64. When it reaches the appropriate position, the drop groove body 621 cooperates with the annular groove 610 to prevent the piston rod 61 from retracting or shaking at will. This is equivalent to providing an additional "locking" function for the piston rod 61. When adjustment or release is required, the external operator can apply a certain external force to the piston rod 61 or the positioning rod 62 to make the positioning rod 62 deviate from the position of the annular groove 610. The preload force of the first spring 64 and the second spring 65 will change accordingly, allowing the piston rod 61 to retract, thereby releasing the extrusion on the end of the first swing arm 81.

[0075] Embodiment 2 In this embodiment, the auxiliary bracket 8 is composed of two swing arms, namely a first swing arm 81 and a second swing arm 82. Different from the embodiment 1, the first ends of the first swing arm 81 and the second swing arm 82 are directly superimposed together, and the first ends of the swing arms are not provided with convex teeth, but rely on the connection of the pin shaft to achieve synchronous movement of the swing arms.

[0076] Structural analysis of Example 1 and Example 2: Example 1 ensures that the two swing arms rotate synchronously and the force is evenly distributed, thereby reducing local stress concentration through the convex tooth meshing mechanism.

[0077] The second embodiment relies on the pin connection, and the synchronization of the swing arm is limited by the tightness and wear condition of the pin, which easily leads to uneven force and increases the risk of structural stress concentration and instability.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine crane, characterized in that: include: The base comprises a mounting unit and two supporting feet, wherein the supporting feet and the mounting unit are detachably connected, and the two supporting feet are arranged on both sides of the mounting unit. The column is detachably connected to the mounting unit, and the end of the column is provided with a docking portion for connecting one end of the boom. The boom has one end connected to the docking part and the other end provided with a hook. The column is also connected to a hydraulic cylinder, the lower end of the hydraulic cylinder is rotatably connected to the column, and the upper end of the hydraulic cylinder is rotatably connected to the boom. An auxiliary bracket is also provided between the boom and the column, and the auxiliary bracket is convenient for supporting the boom when the boom is driven upward by the hydraulic cylinder; The outer peripheral wall of the boom is provided with two symmetrical hanging parts, and the ends of the hanging parts are provided with a first movable opening. The outer peripheral wall of the column is provided with two symmetrical hanging parts, and the ends of the hanging parts are provided with a second movable opening. The two ends of the auxiliary bracket are rotatably connected to the first movable opening and the second movable opening respectively; The auxiliary bracket includes a first swing arm and a second swing arm, the head end of the first swing arm is movably connected to the head end of the second swing arm, the end of the first swing arm is movably connected to the first movable opening, and the end of the second swing arm is movably connected to the second movable opening. The first swing arm and the second swing arm are connected to a docking plate at their head ends, and two shafts are arranged on the docking plate. The first swing arm and the second swing arm are sleeved on the shafts and are rotatably connected to the shafts. The outer peripheral walls of the first and second swing arms are both provided with convex teeth, and the convex teeth on the first and second swing arms mesh with each other; The first and second swing arms are detachably connected with a card shell at their head ends, the inner wall of the card shell is provided with convex teeth, and the side wall of the card shell is provided with two U-shaped openings.

2. The engine crane according to claim 1, characterized in that: Guide grooves are provided on both side walls of the installation unit, and two limit rings are provided on the outer sides of the guide grooves. A placement station is formed between the limit rings and the guide grooves for the support legs to extend into. Positioning holes are provided on the limit rings, and locking screws are connected to the positioning holes for squeezing the support legs.

3. The engine crane according to claim 2, characterized in that: A positioning plate is provided on the end of the supporting foot, a work station hole is opened on the upper end face of the positioning plate, a socket is opened on the limiting ring close to the positioning plate, a caster mounting plate is inserted into the socket, the caster mounting plate is pressed on the upper edge of the positioning plate, a docking hole connected to the work station hole is opened on the caster mounting plate, and the docking hole and the work station hole are connected by screws.

4. The engine crane according to claim 3, characterized in that: The caster placement plate is provided with a rear caster, and the two rear casters are connected by a traction plate, which is placed below the mounting unit. The head end of the supporting foot is provided with a front caster.

5. The engine crane according to claim 1, characterized in that: A movable channel is provided on the upper hanging member, the movable channel runs through the main body thereof and is communicated with the first movable opening, a locking structure is movably connected in the movable channel, the locking structure comprises a piston rod, a positioning rod and an extrusion end, the extrusion end is connected to one end of the piston rod, the other end of the piston rod extends out of the movable channel, the piston rod presses against the extrusion end and contacts the end of the first swing arm.

6. The engine crane according to claim 5, characterized in that: A guide cylinder is provided on the outer side wall of the upper hanging member, and a guide hole connected to the movable channel is provided in the guide cylinder, and the guide hole and the movable channel are in a vertical relationship. The positioning rod and the guide hole are movably connected, a first spring is sleeved on the positioning rod, a slot body is provided at the end of the positioning rod, the diameter of the slot body is larger than the diameter of the positioning rod, and the two ends of the first spring respectively contact the top of the guide hole and the slot body. The piston rod comprises a thick rod portion and a thin rod portion, a second spring is sleeved on the thin rod portion, and two ends of the second spring respectively contact the thick rod portion and the top wall of the active channel. The thick rod portion is provided with an annular groove matched with the drop trough body.

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