Electric hoist for microwave anechoic chamber

Abstract

The application relates to a microwave darkroom electric hoist, and relates to the field of engineering devices, which comprises a drum shell, a drum driving motor, a drum, a steel wire rope, a guide wheel, a movable pulley, a lifting hook and a twisting force releaser, the drum driving motor is fixedly connected to one side of the drum shell, the drum is rotationally connected to the middle part of the drum shell, and the drum is rotationally connected with the drum driving motor; one end of the steel wire rope is wound on the drum, the other end of the steel wire rope passes through the guide wheel rotationally connected below the drum and the movable pulley below the guide wheel, and is fixedly connected with the twisting force releaser upwards; the lifting hook is hinged on the movable pulley; and the twisting force releaser is arranged on one side of the lower part of the drum shell. The application has the advantages of effectively avoiding the interference between the steel wire rope and the darkroom hoisting gap and releasing the twisting force of the steel wire rope.

Description

Technical Field

[0001] This invention relates to the field of engineering device technology, and in particular to an electric hoist suitable for microwave anechoic chambers. Background Technology

[0002] To ensure proper hoisting of the test target in the microwave anechoic chamber and reduce electromagnetic leakage, a hoisting slit no wider than 100mm is provided at the top of each test location. A closed, metal-shielded hoist pod is installed on the roof of the chamber on both sides of the slit. A hoist guide rail is mounted on top of the hoist pod, and the structural symmetry plane of the hoist guide rail coincides with the mid-plane of the hoisting slit. An electric hoist is typically installed on the hoist guide rail. Figure 1 and Figure 2 As shown, the diameter of the electric hoist drum is generally above 300mm. The wire rope fixing assembly is located in the middle of the rear side of the drum casing, arranged diagonally with the winding and unwinding wire rope, to ensure that the lifting point of the electric hoist hook is located on the axis of symmetry of the drum.

[0003] Conventional electric hoists with this structural form inevitably experience interference between the hoisting wire rope and the narrow gap in the darkroom, causing friction between the wire rope and the metal baffles on both sides of the gap, making it difficult to ensure normal hoisting operations of the target in the darkroom.

[0004] Therefore, to address the above shortcomings, it is necessary to provide an electric hoist suitable for microwave anechoic chambers. Summary of the Invention

[0005] (a) Technical problems to be solved The technical problem to be solved by this invention is to solve the problem of interference between the wire rope of a conventional electric hoist and the narrow gap in the dark room.

[0006] (II) Technical Solution To solve the above-mentioned technical problems, the present invention provides an electric hoist suitable for microwave anechoic chambers, including a drum shell, a drum drive motor, a drum, a wire rope, a guide wheel, a movable pulley, a hook, and a twisting force release device. The drum drive motor is fixedly connected to one side of the drum shell, and the drum is rotatably connected to the middle of the drum shell. The drum and the drum drive motor are rotatably connected. One end of the wire rope is wound around the drum, and the other end of the wire rope passes around the guide wheel rotatably connected below the drum and the movable pulley below the guide wheel and is fixedly connected upward to the twisting force release device. The hook is hinged to the movable pulley, and the twisting force release device is mounted on one side of the lower part of the drum shell.

[0007] As a further explanation of the present invention, preferably, the twisting force release device includes a release sleeve, an upper pin, a support, a release shaft, a wedge block, a wedge sleeve, and a lower pin. The support is fixedly connected to the drum shell, the release sleeve is embedded in the support, and the upper pin is inserted between the release sleeve and the support to make the release sleeve and the support hinged. The release shaft is mounted on the lower part of the release sleeve, the wedge block is wedged into the inner cavity of the wedge sleeve, the wedge sleeve is hinged to the release shaft through the lower pin, and the wire rope is wound from bottom to top and then down around the wedge block and clamped between the wedge block and the wedge sleeve.

[0008] As a further explanation of the present invention, preferably, the rotation axis of the release shaft is perpendicular to the rotation axis of the upper pin shaft, and the axes of the lower pin shaft and the upper pin shaft are intersecting or parallel to each other in opposite planes.

[0009] As a further explanation of the present invention, preferably, a round nut is threadedly connected to the upper outer periphery of the release shaft, and a bearing is sleeved around the middle outer periphery of the release shaft, the bearing being a thrust bearing; the round nut is threadedly connected to the upper part of the release shaft, a round washer abuts against the lower end face of the round nut, the lower end face of the round washer abuts against the upper ring end face of the bearing, a load cell abuts against the lower ring end face of the bearing, and the lower end face of the load cell abuts against the round shoulder of the lower inner cavity of the release sleeve; the release shaft, through the round nut, round washer, bearing, and load cell, presses against the inner shoulder of the release sleeve in sequence and is concentric, and the release shaft rotates relative to the release sleeve through the bearing.

[0010] As a further explanation of the present invention, preferably, a guide rod is fixedly connected to the lower part of the drum shell, the length direction of the guide rod is parallel to the length direction of the drum, and a guide wheel is sleeved on the guide rod so that the guide wheel can rotate and slide on the guide rod.

[0011] As a further explanation of the present invention, preferably, the roll shell is provided with a translation drive wheel set, and the translation drive wheel set is provided with a translation drive motor. The translation drive motor drives the translation drive wheel set to rotate so that the roll shell moves along the length direction of the roll.

[0012] (III) Beneficial Effects The above-described technical solution of the present invention has the following advantages: This invention, by setting up sliding and rotating guide wheels and fixing one end of the wire rope to one side of the electric hoist, ensures that the axes of the two wire ropes are always located on the symmetrical mid-plane of the hoisting slit during the lifting and lowering of the hook and the horizontal movement of the hoist. This solves the problems of interference and friction between the wire rope and the metal guard plates on both sides of the hoisting slit. At the same time, it can automatically release the residual twisting force of the wire rope when the hook is lifted and lowered, further avoiding interference and friction between the wire rope and the metal guard plates on both sides of the hoisting slit. Attached Figure Description

[0013] Figure 1 This is a front view of an existing electric hoist; Figure 2 This is a side view of an existing electric hoist; Figure 3 This is a front view of the electric hoist of the present invention; Figure 4 This is a side view of the electric hoist of the present invention; Figure 5 This is a structural diagram of the wire rope routing of the present invention; Figure 6 This is a structural diagram of the twisting force release device of the present invention; Figure 7 yes Figure 6 A magnified view of A in the middle.

[0014] In the diagram: 1. Drum housing; 11. Guide rod; 12. Translation drive wheel assembly; 13. Translation drive motor; 2. Drum drive motor; 3. Drum; 4. Wire rope; 5. Guide wheel; 6. Moving pulley; 7. Hook; 8. Twist force release device; 81. Release sleeve; 82. Upper pin; 83. Support; 84. Release shaft; 85. Wedge block; 85-1. Wedge sleeve; 86. Lower pin; 87. Weighing sensor; 88. Bearing; 89. Round nut; 89-1. Round washer; 9. Darkroom roof. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] An electric hoist suitable for microwave anechoic chambers, combined with Figure 3 , Figure 4 The device includes a drum housing 1, a drum drive motor 2, a drum 3, a wire rope 4, a guide wheel 5, a movable pulley 6, a hook 7, and a twisting force release device 8. The drum drive motor 2 is fixedly connected to one side of the drum housing 1, and the drum 3 is rotatably connected to the middle of the drum housing 1. The drum 3 is rotatably connected to the drum drive motor 2. One end of the wire rope 4 is wound around the drum 3, and the other end of the wire rope 4 passes around the guide wheel 5 rotatably connected below the drum 3 and the movable pulley 6 below the guide wheel 5 and is fixedly connected upward to the twisting force release device 8. The hook 7 is hinged to the movable pulley, and the twisting force release device 8 is mounted on one side of the lower part of the drum housing 1.

[0017] Combination Figure 3 , Figure 4The drum shell 1 is a long strip-shaped shell. A guide rod 11 is fixedly connected to the lower part of the drum shell 1. The guide rod 11 is a cylindrical smooth rod, and its length direction is parallel to the length direction of the drum 3. A guide wheel 5 is sleeved on the guide rod 11 to allow the guide wheel 5 to rotate and slide on the guide rod 11. The drum shell 1 is provided with a translation drive wheel set 12, and a translation drive motor 13 is provided on the translation drive wheel set 12. The translation drive motor 13 drives the translation drive wheel set 12 to rotate, so that the drum shell 1 moves along the length direction of the drum 3, thereby realizing the control of the axial movement of the electric hoist.

[0018] Combination Figure 4 , Figure 5 The guide wheel 5 has a rope groove, and the guide wheel 5 and the guide rod 11 are fitted with a clearance. The winding direction of the wire rope 4 on the drum 3 is opposite to that of the conventional hoist wire rope (the conventional hoist winds the wire rope from the front of the drum when winding or unwinding the wire rope (see...) Figure 1 In this invention, the hoist winding and unwinding wire rope 4 exits from behind the drum 3 (see...). Figure 3 The wire rope 4 passes over the guide wheel 5 from the rear of the drum 3 and exits from the front. The axis of the wire rope 4 is located within the vertical plane of the drum 3. During the rotation of the drum 3, the friction between the wire rope 4 and the guide wheel 5 causes the guide wheel 5 to rotate and translate along the guide rod 11. The twisting force release device 8, which was fixed to the rear side of the conventional hoist drum shell, has been moved to the outer end face of the drum shell 1 and welded to the drum shell 1 through a support. It ensures that the axis of the wire rope 4 at its end is coplanar with the axis of the wire rope 4 exiting the guide wheel 5 and the vertical plane of the drum 3. Through the above design, it can be ensured that during the lifting and lowering of the hook 7 and the translation of the hoist, the axes of the two wire ropes 4 are always located on the symmetrical mid-plane of the hoisting slit in the roof of the dark room 9, solving the problems of interference and friction between the wire rope 4 and the metal guard plates on both sides of the hoisting slit.

[0019] Combination Figure 6 , Figure 7The twisting force release device 8 includes a release sleeve 81, an upper pin 82, a support 83, a release shaft 84, a wedge block 85, a wedge sleeve 85-1, and a lower pin 86. The support 83 is fixedly connected to the drum shell 1. The release sleeve 81 is embedded in the support 83. The upper pin 82 is inserted between the release sleeve 81 and the support 83 to make the release sleeve 81 and the support 83 hinged. The release shaft 84 is rotatably connected to the middle of the release sleeve 81. The release shaft 84 is located at the lower part of the release sleeve 81, and the rotation axis of the release shaft 84 is perpendicular to the rotation axis of the upper pin 82. A wedge sleeve 85-1 is provided at the bottom of the release shaft 84. The wedge block 85 is wedged into the inner cavity of the wedge sleeve 85-1. The wedge sleeve 85-1 is hinged to the release shaft 84 through the lower pin 86. The rotation axis of the lower pin 86 is perpendicular to the rotation axis of the release shaft 84. The axes of the lower pin 86 and the upper pin 82 are either intersecting or parallel to each other. The wire rope 4 is wound around the wedge block 85 from bottom to top and then downward and is engaged in the inner cavity of the wedge sleeve 85-1. A round nut 89 is threadedly connected to the upper outer periphery of the release shaft 84, and a bearing 88 is sleeved on the middle outer periphery of the release shaft 84. The bearing 88 is a thrust bearing. The round nut 89 is threadedly connected to the upper part of the release shaft 84. A round washer 89-1 abuts against the lower end face of the round nut 89. The lower end face of the round washer 89-1 abuts against the upper end face of the bearing 88. A load cell 87 abuts against the lower end face of the bearing 88. The lower end face of the load cell 87 abuts against the round shoulder of the lower inner cavity of the release sleeve 81. The release shaft 84, through the round nut 89, round washer 89-1, bearing 88, and load cell 87, presses against the inner shoulder of the release sleeve 81 in sequence and is concentric. The release shaft 84 rotates relative to the release sleeve 81 through the bearing 88.

[0020] Because current national standard wire ropes all have residual twisting force, during the no-load lifting and lowering process of a double-rate electric hoist, the residual twisting force of the wire rope will cause the hook pulley 6 to deflect, changing the relative position of the wire ropes 4 on both sides. In severe cases, this can lead to the two wire ropes getting tangled, and it can also cause interference and friction between the wire rope 4 and the metal guard plates on both sides of the hoist cabin lifting slit. By designing a twisting force release device 8, a lower pin 86, a wedge block 85, a wedge sleeve 85-1, a release shaft 84, a round nut 89, a round washer 89-1, a bearing 88, a load cell 87, a release sleeve 81, an upper pin 82, and a support 83, the load force of the end wire rope 4 is transferred to the drum casing support. Since the upper and lower rings of bearing 88 can rotate relative to each other, during the lifting and lowering of the hook, the residual twisting force of the wire rope 4 will cause the upper ring of bearing 88 to deflect relative to the release sleeve 81, thereby realizing the automatic release of the residual twisting force of the wire rope. This avoids problems such as the two wire ropes 4 getting tangled or interfering with the metal guard plates on both sides of the lifting slit due to the residual twisting force.

[0021] In summary, by setting up a sliding and rotating guide wheel 5 and fixing one end of the wire rope 4 to one side of the electric hoist, this invention can ensure that the axes of the two wire ropes 4 are always located on the symmetrical mid-plane of the hoisting slit during the lifting and lowering of the hook 7 and the horizontal movement of the hoist. This solves the problems of interference and friction between the wire rope 4 and the metal guard plates on both sides of the hoisting slit. At the same time, it can automatically release the residual twisting force of the wire rope 4 when the hook 7 is lifted and lowered, further avoiding interference and friction between the wire rope 4 and the metal guard plates on both sides of the hoisting slit, achieving multiple benefits in one fell swoop.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric hoist suitable for microwave anechoic chambers, characterized in that: The device includes a drum housing (1), a drum drive motor (2), a drum (3), a wire rope (4), a guide wheel (5), a movable pulley (6), a hook (7), and a twisting force release device (8). The drum drive motor (2) is fixedly connected to one side of the drum housing (1), and the drum (3) is rotatably connected to the middle of the drum housing (1). The drum (3) is rotatably connected to the drum drive motor (2). One end of the wire rope (4) is wound around the drum (3), and the other end of the wire rope (4) passes around the guide wheel (5) rotatably connected below the drum (3) and the movable pulley (6) below the guide wheel (5) and is fixedly connected upward to the twisting force release device (8). The hook (7) is hinged to the movable pulley (6), and the twisting force release device (8) is mounted on one side of the lower part of the drum housing (1).

2. The electric hoist suitable for microwave anechoic chambers according to claim 1, characterized in that: The twisting force release device (8) includes a release sleeve (81), an upper pin (82), a support (83), a release shaft (84), a wedge block (85), a wedge sleeve (85-1), and a lower pin (86). The support (83) is fixedly connected to the drum shell (1). The release sleeve (81) is embedded in the support (83). The upper pin (82) is inserted between the release sleeve (81) and the support (83) to make the release sleeve (81) and the support (83) hinged. The release shaft (84) is mounted on the lower part of the release sleeve (81). The wedge block (85) is wedged into the inner cavity of the wedge sleeve (85-1). The wedge sleeve (85-1) is hinged to the release shaft (84) through the lower pin (86). The wire rope (4) is wound from bottom to top and then down around the wedge block (85) and clamped between the wedge block (85) and the wedge sleeve (85-1).

3. The electric hoist suitable for microwave anechoic chambers according to claim 2, characterized in that: The rotation axis of the lower pin (86) is perpendicular to the rotation axis of the release shaft (84), and the axes of the lower pin (86) and the upper pin (82) are either intersecting or parallel.

4. The electric hoist suitable for microwave anechoic chambers according to claim 3, characterized in that: A round nut (89) is threadedly connected to the upper outer periphery of the release shaft (84), and a bearing (88) is sleeved on the middle outer periphery of the release shaft (84). The bearing (88) is a thrust bearing. The round nut (89) is threadedly connected to the upper part of the release shaft (84). A round washer (89-1) abuts against the lower end face of the round nut (89). The lower end face of the round washer (89-1) abuts against the upper end face of the bearing (88). A load cell (87) abuts against the lower end face of the bearing (88). The lower end face of the load cell (87) abuts against the round shoulder of the lower inner cavity of the release sleeve (81). The release shaft (84) presses against the inner shoulder of the release sleeve (81) in sequence through the round nut (89), the round washer (89-1), the bearing (88), and the load cell (87) and is concentric. The release shaft (84) rotates relative to the release sleeve (81) through the bearing (88).

5. The electric hoist suitable for microwave anechoic chambers according to claim 1, characterized in that: A guide rod (11) is fixedly connected to the lower part of the drum shell (1). The length direction of the guide rod (11) is parallel to the length direction of the drum (3). The guide wheel (5) is sleeved on the guide rod (11) so that the guide wheel (5) can rotate and slide on the guide rod (11).

6. The electric hoist suitable for microwave anechoic chambers according to claim 1, characterized in that: The roll shell (1) is provided with a translation drive wheel set (12), and the translation drive wheel set (12) is provided with a translation drive motor (13). The translation drive motor (13) drives the translation drive wheel set (12) to rotate so that the roll shell (1) moves along the length direction of the roll (3).

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