A straight boom crane

Abstract

The present invention relates to a straight boom crane, which may include: a frame; a first main shaft rotatably mounted on the frame and drivingly connected to a motor; a winding drum mounted on the first main shaft and capable of moving along the axial direction of the first main shaft while rotating with the first main shaft, so that the winding and unwinding positions of the steel wire rope wound on the winding drum remain unchanged; a sheath mounted on the frame and sleeved outside the winding drum, capable of moving along the axial direction of the first main shaft with the winding drum, the sheath having an axial opening for the steel wire rope to pass through for winding and unwinding; and a wire pressing wheel mounted on the frame and drivingly connected to the motor, the wire pressing wheel being located at the winding and unwinding position and pressing against the steel wire rope. By means of the sheath outside the winding drum in the present invention, it can be ensured that the steel wire rope will not become loose or jump out of the loop under any circumstances, greatly improving the service life of the crane. At the same time, since the wire pressing wheel is driven by the motor, a good pressing force can be provided to ensure that the steel wire rope will not jump.

Description

Technical Field

[0001] The present invention belongs to the field of electric hoists, and particularly relates to a straight barrel hoist. Background Art

[0002] An electric hoist is a widely used automatic lifting device. An electric hoist generally includes a winding drum with wire grooves and a steel wire rope wound on the wire grooves. When lifting a heavy object, when taking in the wire, the steel wire can wind around the winding drum upwards one by one, and the steel wire rope will not become loose or jump out of the circle. However, if in the no-load condition, such as when there is no heavy object, or when power is cut off and it is necessary to manually pull the steel wire rope upwards, the steel wire rope is prone to arch upwards, resulting in the phenomenon of loosening or jumping out of the circle (that is, this circle will run to that circle), so that the steel wire rope will become disorderly, making the hoist unable to be used normally (scrapped) and having a short service life.

[0003] In addition, the wire pressing wheels of the existing electric hoists are all driven wheels, which are prone to jumping and cannot be pressed tightly, thus affecting the normal operation of the electric hoist. Summary of the Invention

[0004] The present invention aims to provide a straight barrel hoist to solve the above problems. For this purpose, the specific technical solutions adopted by the present invention are as follows:

[0005] A straight barrel hoist may include:

[0006] A frame;

[0007] A first main shaft, the first main shaft is rotatably installed on the frame and is drivingly connected to a motor;

[0008] A winding drum, the winding drum is installed on the first main shaft and can move along the axial direction of the first main shaft while rotating with the first main shaft, so that the winding and unwinding positions of the steel wire rope wound on the winding drum remain unchanged;

[0009] A sheath, the sheath is installed on the frame and sleeved outside the winding drum, and can move along the axial direction of the first main shaft with the winding drum, and the sheath has an axial opening for the winding and unwinding of the steel wire rope;

[0010] And a wire pressing wheel, the wire pressing wheel is installed on the frame and is drivingly connected to the motor, so that its rotation direction is opposite to that of the winding drum, and the wire pressing wheel is located at the winding and unwinding position and presses against the steel wire rope.

[0011] Further, the main shaft has a hexagonal part and a circular part, the winding drum is sleeved on the hexagonal part, a lead screw is sleeved on the circular part, and a nut sleeve is fixed on the end surface of the winding drum away from the motor, and the nut sleeve is threadedly engaged with the lead screw.

[0012] Furthermore, a gear transmission mechanism is used to drive and connect the wire pressing wheel and the motor, and the reduction ratio of the gear transmission mechanism is set so that the wire speeds of the wire pressing wheel and the wire winding drum are the same.

[0013] Furthermore, the gear transmission mechanism includes a second main shaft, a driving gear, a first gear, a second gear, a third gear and a fourth gear. The second main shaft is rotatably installed on the frame and is parallel to the first main shaft. The driving gear is fixed on the first main shaft. The second gear is fixed on the second main shaft. The first gear is installed on the frame and meshes with the driving gear and the second gear on both sides respectively. The third gear is fixed on the second main shaft. The fourth gear is fixed on the wire pressing wheel shaft and meshes with the third gear. The wire pressing wheel is fixed on the wire pressing wheel shaft.

[0014] Furthermore, the number of teeth of the driving gear and the first gear is set to meet the reduction ratio, the number of teeth of the first gear and the second gear is the same, and the number of teeth of the third gear and the fourth gear is the same.

[0015] Furthermore, the second main shaft has a hexagonal part, and the second gear and the third gear have hexagonal central through holes.

[0016] Furthermore, the wire pressing wheel shaft is rotatably installed on the wire pressing wheel bracket, the wire pressing wheel bracket is rotatably installed on the second main shaft, the wire pressing wheel bracket has a spring fixing part, an adjusting screw is installed on the frame, and a spring is installed between the spring fixing part and the adjusting screw so that the angle of the wire pressing wheel can be adjusted through the adjusting screw.

[0017] Furthermore, both ends of the sheath are slidably sleeved on two optical axes, the optical axes are fixed on the frame and are parallel to the first main shaft; both ends of the wire winding drum have clamping grooves, and the inner wall of the sheath has an annular protrusion, and the annular protrusion is clamped in the clamping grooves.

[0018] Furthermore, the sheath includes two halves hinged together.

[0019] Furthermore, a plurality of axially extending needle rollers are installed on the inner wall of the sheath, and the needle rollers contact the steel wire rope.

[0020] The beneficial effects of the present invention adopting the above technical solutions are as follows: By means of the sheath outside the wire winding drum, it can be ensured that the steel wire rope will not become loose or jump out of the loop under any circumstances, greatly improving the service life of the crane. At the same time, since the wire pressing wheel is driven by the motor, that is, it rotates actively, good pressing force can be provided to ensure that the steel wire rope will not jump. Description of the Drawings

[0021] To further illustrate the embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, mainly used to illustrate the embodiments, and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0022] Figure 1 is a perspective view of the straight-bar hoist of the present invention;

[0023] Figure 2 is Figure 1 Another perspective view of the straight-bar hoist shown, wherein part of the frame is removed to show the internal structure;

[0024] Figure 3 is Figure 1 the front view of the straight-bar hoist shown;

[0025] Figure 4 is Figure 3 a cross-sectional view of the straight-bar hoist taken along the line A-A in

[0026] Figure 5 is Figure 1 an exploded view of the mounting structure of the winding drum of the straight-bar hoist shown;

[0027] Figure 6 is Figure 1 a perspective view of the sheath of the straight-bar hoist shown;

[0028] Figure 7 is Figure 1 a perspective view of the mounting structure of the wire pressing wheel of the straight-bar hoist shown. Detailed Embodiments

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] As Figure 1-4 shown, a straight-bar hoist may include:

[0031] A frame 1, the frame 1 is in the shape of a rectangular body and may be made of steel structure;

[0032] A first main shaft 2, the first main shaft 2 is rotatably installed on the frame 1 and is drivingly connected to a motor 3, that is, both ends of the first main shaft 2 are respectively installed on the frame 1 through corresponding bearings (for example, deep groove bearings), and one end thereof is connected to the output shaft 31 of the motor 3 through a corresponding speed reducer 32. Therefore, the first main shaft 2 can be driven to rotate by the motor 3;

[0033] The wire winding drum 4 has multiple turns of wire grooves 41 arranged in a spiral pattern thereon. The wire grooves 41 are used to receive the wire rope 5 (only the vertical section is shown in the figure). The wire winding drum 4 is mounted on the first main shaft 2 and can move along the axial direction of the first main shaft 2 while rotating with the main shaft 2, so that the winding and unwinding positions of the wire rope 5 wound around the wire winding drum 4 remain unchanged. That is, the wire winding drum 4 can rotate and move axially at the same time;

[0034] The sheath 6 is mounted on the frame 1 and sleeved outside the wire winding drum 4. It can move along the axial direction of the first main shaft 2 with the wire winding drum 4. The sheath 6 has an axial opening 61 for the wire rope 5 to pass through for winding and unwinding (see Figure 6 ). The gap between the sheath 6 and the wire winding drum 4 is smaller than the wire diameter of the wire rope 5. Therefore, the wire rope 5 will not jump out of the loop when being wound;

[0035] And the wire pressing wheel 7 is mounted on the frame 1 and is drivingly connected to the motor 3, so that its rotation direction is opposite to that of the wire winding drum 4. The wire pressing wheel 7 is located at the winding and unwinding position and presses against the wire rope 5. Since the wire pressing wheel 7 is driven by the motor 3, that is, it rotates actively, it can provide a good pressing force to ensure that the wire rope does not jump.

[0036] As Figure 4 and 5 shown, the first main shaft 2 and the reducer 32 are connected by a keyway (flat key) method. Specifically, the first main shaft 2 has a through hole 23 with a rectangular groove 231, and the output shaft of the reducer 32 has a flat key 321. The first main shaft 2 has a hexagonal part 21 and a circular part 22. The wire winding drum 4 has a hexagonal central through hole 42. The wire winding drum 4 is fixedly connected to the first main shaft 2 by sleeving the hexagonal central through hole 42 on the hexagonal part 21. Therefore, the wire winding drum 4 can rotate with the first main shaft 2. It should be understood that the wire winding drum 4 can also be fixed to the first main shaft 2 by other common methods. A lead screw 81 is sleeved on the circular part 22. The lead screw 81 is a T-shaped lead screw, and its flange end is fixed to the frame 1 by screws. A nut sleeve 82 is fixed on the end face of the wire winding drum 4 away from the motor 3. The nut sleeve 82 is a T-shaped nut sleeve, and its flange end is fixed to the wire winding drum 4 of the frame by screws. The nut sleeve 82 is threadedly engaged with the lead screw 81. Therefore, the wire winding drum 4 can move axially while rotating. The outlet end of the wire rope 5 is located at one end of the wire winding drum 4 away from the motor 3. When paying out the wire, the wire winding drum 4 moves in the direction away from the motor 3, and when winding the wire, the wire winding drum 4 moves in the direction close to the motor 3.

[0037] As Figure 2 、 4As shown in FIGS. 6, the two ends of the sheath 6 are respectively slidably sleeved on two optical axes 62. The optical axes 62 are fixed on the frame 1 and parallel to the first main shaft 2. Both ends of the winding drum 4 have clamping grooves 43. Correspondingly, the inner wall of the sheath 6 has annular protrusions 63, and the annular protrusions 63 are clamped in the clamping grooves 43. Therefore, the sheath 6 can slide along the optical axes 62 with the winding drum 4. For the convenience of installation, the sheath 6 includes two halves hinged together, that is, the sheath 6 is in the shape of a clamp.

[0038] Preferably, a plurality of axially extending needle rollers 64 are installed on the inner wall of the sheath 6. The needle rollers 64 contact the steel wire rope 5, that is, the steel wire rope 5 is limited to prevent it from jumping out of the loop. Since the needle rollers 64 can rotate with the steel wire rope 5, no damage will be caused to the steel wire rope 5.

[0039] To improve the strength of the annular protrusions 63 of the sheath 6 and prevent them from being deformed and disengaged from the winding drum 4 due to excessive force, a plurality of reinforcing angle codes 65 are provided between the annular protrusions 63 and the inner wall of the sheath 6.

[0040] The sheath 6 can be made of a metal material (such as steel) or a high-strength non-metal material.

[0041] As Figure 1 、 2 As shown in FIGS. 6 and 7, a gear transmission mechanism is used to drive and connect the wire pressing wheel 7 and the motor 2. Specifically, the gear transmission mechanism may include a second main shaft 91, a driving gear 92, a first gear 93, a second gear 94, a third gear 95, and a fourth gear 96. The second main shaft 91 is rotatably installed on the frame 1 through bearings at both ends and is parallel to the first main shaft 2. The driving gear 92 is fixed on the first main shaft 2 (specifically, the hexagonal part 21), that is, the driving gear 92 has a hexagonal through hole. The first gear 93 is installed on the frame 1 and meshes with the driving gear 92 and the second gear 94 on both sides respectively, that is, the first gear 93 serves as an idler gear. The second gear 94 and the third gear 95 are respectively fixed on both sides of the second main shaft 91. The fourth gear 96 is fixed on the wire pressing wheel shaft 71 and meshes with the third gear 95. The wire pressing wheel shaft 71 is parallel to the second main shaft 91, and the wire pressing wheel 7 is fixed on the wire pressing wheel shaft 71.

[0042] To make the wire pressing wheel 7 and the winding drum 4 have the same linear speed, the gear transmission mechanism must have an appropriate reduction ratio. In a specific embodiment, the reduction ratio of the gear transmission mechanism is 4:1. The number of teeth of each gear is as follows: the number of teeth of the driving gear 92 is 124, the number of teeth of the first gear 93 and the second gear 94 are both 31, and the number of teeth of the third gear 95 and the fourth gear 96 are both 20.

[0043] Preferably, the driving gear 92, the first gear 93, the second gear 94, the third gear 95 and the fourth gear 96 are all spur gears.

[0044] For the convenience of installation, the second main shaft 91 has a hexagonal portion 911, and the second gear 94 and the third gear 95 have hexagonal central through holes. The second gear 94 and the third gear 95 are fixed on the second main shaft 91 by fitting their hexagonal central through holes with the hexagonal portion 911 and corresponding circlips.

[0045] In this embodiment, the wire pressing wheel shaft 71 is rotatably mounted on the wire pressing wheel bracket 72. The wire pressing wheel bracket 72 is rotatably mounted on the second main shaft 91. That is, the wire pressing wheel bracket 72 has a through hole for the second main shaft 91 to pass through. The wire pressing wheel bracket 72 has a spring fixing portion 721. In this embodiment, the spring fixing portion 721 is a cross-shaped columnar protrusion. An adjusting screw 73 is mounted on the frame 1, and a spring 74 is mounted between the spring fixing portion 721 and the adjusting screw 73, so that the angle of the wire pressing wheel 7 can be adjusted through the adjusting screw 73, and further the pressing force thereof can be adjusted to ensure that the steel wire rope does not jump.

[0046] In addition, as Figure 2 and 3 shown, the straight barrel hoist further includes a steel wire rope guiding mechanism, which is fixedly mounted on the frame 1 and located below the winding drum 4 for guiding the steel wire rope 5 to prevent it from swinging. The steel wire rope guiding mechanism may include a pair of rollers 101 and a disc 102 with a guiding through hole (not shown). The pair of rollers 101 is used to clamp the steel wire rope 5. The guiding through hole is located directly below the pair of rollers 101, so that the steel wire rope 5 can pass through between the pair of rollers 101 and pass out through the guiding through hole.

[0047] Preferably, the motor 3 is a stepping motor to facilitate the control of the lifting of the steel wire rope 5.

[0048] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all of them are within the protection scope of the present invention.

Claims

1. A straight-bar crane, characterized in that, Comprising: A frame; A first main shaft rotatably mounted on the frame and drivingly connected to a motor; A wire winding cylinder mounted on the first main shaft and capable of moving along the axial direction of the first main shaft while rotating with the first main shaft, so that the winding and unwinding positions of the wire rope wound on the wire winding cylinder remain unchanged; A sheath mounted on the frame and sleeved outside the wire winding cylinder, capable of moving along the axial direction of the first main shaft with the wire winding cylinder, and the sheath has an axial opening for the wire rope to wind and unwind; The gap between the sheath and the wire winding cylinder is smaller than the wire diameter of the wire rope; A plurality of axially extending needle rollers are mounted on the inner wall of the sheath, and the needle rollers contact the wire rope; And a wire pressing wheel mounted on the frame and drivingly connected to the motor, so that its rotation direction is opposite to that of the wire winding cylinder. The wire pressing wheel is located at the winding and unwinding position and presses against the wire rope. A gear transmission mechanism is used for driving connection between the wire pressing wheel and the motor; The first main shaft has a hexagonal part and a circular part. The wire winding cylinder is sleeved on the hexagonal part, a lead screw is sleeved on the circular part, and a nut sleeve is fixed on the end face of the wire winding cylinder far away from the motor. The nut sleeve is threadedly engaged with the lead screw; Both ends of the sheath are slidably sleeved on two optical axes, and the optical axes are fixed on the frame and parallel to the first main shaft; both ends of the wire winding cylinder have clamping grooves, and the inner wall of the sheath has an annular protrusion, and the annular protrusion is clamped in the clamping grooves; The gear transmission mechanism includes a second main shaft, a driving gear, a first gear, a second gear, a third gear and a fourth gear. The second main shaft is rotatably mounted on the frame and parallel to the first main shaft. The driving gear is fixed on the first main shaft, the second gear is fixed on the second main shaft, the first gear is mounted on the frame and meshed with the driving gear and the second gear respectively on both sides, the third gear is fixed on the second main shaft, the fourth gear is fixed on the wire pressing wheel shaft and meshed with the third gear, and the wire pressing wheel is fixed on the wire pressing wheel shaft; The wire pressing wheel shaft is rotatably mounted on a wire pressing wheel bracket, the wire pressing wheel bracket is rotatably mounted on the second main shaft, the wire pressing wheel bracket has a spring fixing part, an adjusting screw is mounted on the frame, and a spring is mounted between the spring fixing part and the adjusting screw to adjust the angle of the wire pressing wheel through the adjusting screw.

2. The straight boom crane according to claim 1, characterized in that, The reduction ratio of the gear transmission mechanism is set so that the linear speeds of the wire pressing wheel and the wire winding cylinder are the same.

3. The straight boom crane according to claim 2, wherein The number of teeth of the driving gear and the first gear is set to meet the reduction ratio, the number of teeth of the first gear and the second gear is the same, and the number of teeth of the third gear and the fourth gear is the same.

4. The straight boom crane according to claim 1, wherein, The second main shaft has a hexagonal part, and the second gear and the third gear have hexagonal central through holes.

5. The straight boom crane according to claim 1, characterized in that, The sheath includes two halves hinged together.

Images