Lifting limiting device of electric chain hoist

Abstract

The utility model discloses a lifting limit device of an electric chain hoist, which is characterized in that a lifting limit switch and a descending limit switch are respectively accommodated in a switch base and a switch base cover, an ejector rod I and an ejector rod II are respectively positioned in the switch base and the switch base cover, the switch base cover, an ejector rod I positioning pressure spring I, the switch base cover and an ejector rod II positioning pressure spring II are arranged on the switch base, and a vertical through hole I and a vertical through hole II are arranged on the switch base. The seat frame is provided with a vertical through hole I and a vertical through hole II, the ejector rod I sequentially penetrates through the vertical through hole I and the vertical through hole I, the ejector rod II sequentially penetrates through the vertical through hole II and the vertical through hole II, the ascending limiting switch and the descending limiting switch are arranged between the ejector rod I and the ejector rod II respectively, the flexible reed I is clamped in the ascending limiting switch, and a free section of the flexible reed I is arranged between a radial pressing head I of the ejector rod I and the ascending limiting switch. And the flexible reed II is clamped in the descending limit switch, and the free section of the flexible reed II is arranged between the radial pressure head II of the ejector rod II and the descending limit switch. After the scheme is adopted, the collision ejector rod and the flexible reed exert soft force on the limit switch, so that the service life is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lifting limiting device of ring chain electric hoist belongs to ring chain electric hoist lifting limiting technical field.

BACKGROUND

[0002] The load section and the no-load section of the hoisting chain are respectively provided with collision blocks that can trigger the action of the limiting switch, and the collision blocks are solid metal blocks. The ring chain electric hoist is usually provided with an upward limiting switch and a downward limiting switch for lifting limiting and no-load downward limiting. The two limiting switches are usually separately arranged in the hoist body. Since the interior of the hoist body is limited, the limiting switch has a small volume so as to occupy a relatively small space in the hoist body. The contact of the limiting switch is small. Since the collision block is located below the limiting switch, the limiting switch and the collision block are in a vertical corresponding position relationship. The collision block vertically collides with the contact of the limiting switch along the direction of the load lifting track. Therefore, the contact of the limiting switch is easily damaged due to the large force of the collision block. After the limiting switch is damaged, it is inconvenient to replace it, and the hoist body needs to be disassembled for replacement.

[0003] Please refer to CN216072856U discloses a limiting switch assembly for lifting of ring chain electric hoist, Figure 2 The small volume upper stop point limiting switch contact 1 and the lower stop point limiting switch contact 2 are separately and spacedly fixed in the reducer body M. The upper stop point limiting switch contact 1 and the first collision block 5, and the lower stop point limiting switch contact 2 and the first collision block 6 are in a vertical corresponding position relationship. The upward elastic pressing piece 3 is arranged between the upper stop point limiting switch contact 1 and the first collision block 5, and the downward elastic pressing piece 4 is arranged between the lower stop point limiting switch contact 2 and the second collision block 6. This structure objectively has the technical defects described above.

UTILITARIAN CONTENT

[0004] In view of the problems existing in the prior art, the utility model aims to provide a lifting limiting device of ring chain electric hoist.

[0005] To this end, the utility model takes the following technical scheme:

[0006] The lifting limiting device of the chain electric hoist comprises an upward limiting switch, a downward limiting switch and a seat frame which is externally and detachably fixed on the bottom surface of the body of the chain electric hoist, characterized in that the device further comprises a switch seat cover, a switch base, a top rod I, a compression spring I, a flexible spring piece I, a top rod II, a compression spring II and a flexible spring piece II, the switch base is fixed on the inner bottom wall of the seat frame, the switch seat cover is arranged on the switch base, the upward limiting switch and the downward limiting switch are respectively arranged in the switch base and the switch seat cover, the top rod I and the top rod II are respectively arranged in the switch base and the switch seat cover, the compression spring I is positioned by the switch seat cover and the top rod I, and the compression spring II is positioned by the switch seat cover and the top rod II, the switch base is provided with vertical through holes I and II at both ends, the seat frame is provided with vertical through holes I and II corresponding to the positions of the vertical through holes I and II, the top rod I passes through the vertical through hole I and the vertical through hole I in sequence, and the top rod II passes through the vertical through hole II and the vertical through hole II in sequence, the upward limiting switch and the downward limiting switch are respectively arranged between the top rod I and the top rod II, the flexible spring piece I is clamped on the upward limiting switch, and the free section of the flexible spring piece I is arranged between the radial pressing head I of the top rod I and the contact head of the upward limiting switch, the flexible spring piece II is clamped on the downward limiting switch, and the free section of the flexible spring piece II is arranged between the radial pressing head II of the top rod II and the contact head of the downward limiting switch.

[0007] The vertical through hole I is provided with a sealing piece I, and the vertical through hole II is provided with a sealing piece II, the inner hole of the sealing piece I is in contact with the side wall of the top rod I to achieve sealing, and the inner hole of the sealing piece II is in contact with the side wall of the top rod II to achieve sealing.

[0008] After the vertical through holes are respectively provided with the sealing pieces, the sealing performance between the switch base and the top rod is improved, the sealing performance and the moisture-proof effect can be ensured when each top rod slides in the inner hole of the corresponding sealing piece, water vapor cannot penetrate into the limiting switch, the chain electric hoist provided with the device can be used in the marine environment, seawater cannot corrode the limiting switch, and the limiting switch is not easy to be polluted and corroded.

[0009] The lifting limiting device of the chain electric hoist is externally and detachably fixed on the seat frame of the body of the chain electric hoist as a whole, the device does not occupy the valuable space in the body of the hoist, and the limiting switch can be replaced without disassembling the body of the hoist once the limiting switch is damaged, each top rod is driven to abut against the corresponding limiting switch with a lateral and gentle force when the radial pressing head of the top rod moves upward, the contact force of each top rod and each flexible spring piece on the contact head of the corresponding limiting switch is slight, and therefore the working life of the limiting switch is prolonged and the use performance is ensured.

DRAWING EXPLANATION

[0010] Figure 1 It is a perspective view of the utility model;

[0011] Figure 2 This is an exploded view of the present invention;

[0012] Figure 3 A partial cross-sectional view of the present invention is shown;

[0013] Figure 4 Another partial cross-sectional view of the present invention is shown.

Detailed Implementation Methods

[0014] Please see Figure 1 , 2 As shown in Figures 3 and 4, the lifting limit device of the chain electric hoist includes an upper limit switch 51, a lower limit switch 52, and an externally detachable base frame 1, a switch cover 2, a switch base 3, a top rod I 41, a compression spring I 412, a flexible spring I, a top rod II 42, a compression spring II 422, and a flexible spring II 62, all externally and detachably fixed to the bottom surface of the chain electric hoist body (the electric hoist body is existing technology and is not shown). Figure 1 , 2 In the middle, the outermost part of the base frame 1 has a mounting hole for inserting bolts to fasten it to the hoist body.

[0015] The switch base 3 is fixed to the inner bottom wall of the bracket 1. The switch cover 2 is placed on the switch base 3. The upper limit switch 51 and the lower limit switch 52 are respectively housed inside the switch base 3 and the switch cover 2. The push rod I 41 and the push rod II 42 are respectively located in the switch base 3 and the switch cover 2. The compression spring I 412 is positioned by the switch cover 2 and the push rod I 41, and the compression spring II 422 is positioned by the switch cover 2 and the push rod II 42. Figure 3 The upper section of spring II is shown to be fitted onto the switch base cover, with the top of spring II abutting against the inner top wall of the switch base cover. Figure 2The compression spring II is shown to be sleeved on the top rod II, and the bottom end of the compression spring II is in contact with the top rod II; the switch base 3 is provided with vertical through holes I and II 32 at both ends, the seat frame 1 is provided with vertical through holes I 11 corresponding to the vertical through holes I in position and vertical through holes II 12 corresponding to the vertical through holes II 32 in position, the top rod I 41 passes through the vertical through holes I and the vertical through holes I 11 in sequence, and the top rod II 42 passes through the vertical through holes II 32 and the vertical through holes II 12 in sequence; the upward limit switch 51 is arranged between the top rod I 41 and the top rod II 42, and the downward limit switch 52 is arranged between the top rod I 41 and the top rod II 42; the flexible spring I is clamped on the upward limit switch 51, and the free section of the flexible spring I is arranged between the radial pressing head I of the top rod I 41 and the contact of the upward limit switch 51; the flexible spring II 62 is clamped on the downward limit switch 52, and the free section of the flexible spring II 62 is arranged between the radial pressing head II 421 of the top rod II 42 and the contact of the downward limit switch 52; the seat frame 1 is provided with a lifting chain inlet and outlet hole I 13 outside the vertical through hole I 11, and the seat frame 1 is provided with a lifting chain inlet and outlet hole II 14 outside the vertical through hole II 12.

[0016] The load section of the lifting chain corresponds to the lifting chain inlet and outlet hole I 13, and the no-load section of the lifting chain corresponds to the lifting chain inlet and outlet hole II 14; the load section and the no-load section are respectively provided with a collision block (not shown) in a conventional manner; when lifting a heavy object, the collision block at the load section is used to contact the top rod I 41 during the upward movement of the load section, and the collision block at the no-load section is used to contact the top rod II 42 during the downward movement of the heavy object; this is the prior art.

[0017] The upward limit switch and the downward limit switch have the same structure, are installed in a horizontal manner, and the small contact of the upward limit switch and the small contact of the downward limit switch are arranged in opposite directions.

[0018] Figure 2 、 4 The free section of the flexible spring II 62 is shown to be connected and extended upward in sequence by a half U-shaped part 62a and a U-shaped part 62b; this structure has good elastic deformation, Figure 3 、 4 The top rod is shown to be not subjected to collision, wherein Figure 4 The radial pressing head II 421 is shown to be located at the outer wall of the half U-shaped part 62a, and the inner wall of the half U-shaped part 62a is not in contact with the downward limit switch 52; when the top rod II 42 is subjected to an upward collision force, the compression spring II 422 is compressed and deformed, the radial pressing head II 421 is moved upward and contacts the U-shaped part 62b, so that the flexible spring II 62 generates a lateral force to trigger the downward limit switch 52; when the compression spring II 422 is reset, the radial pressing head II 421 is moved downward to Figure 4The axis of the radial pressure head II 421 is perpendicular to the axis of the ejector rod II 42 body portion. The flexible spring I, not visible in the figure but identical in structure to the flexible spring II 62, includes a radial pressure head I identical in structure to the radial pressure head II 421 of the ejector rod II 42.

[0019] The vertical through hole I is provided with a seal I (not shown) and the vertical through hole II 32 is provided with a seal II 72. The inner hole of the seal I is in contact with the side wall of the ejector rod I 41 to seal and the inner hole of the seal II 72 is in contact with the side wall of the ejector rod II 42 to seal.

[0020] The seal I is identical in structure to the seal II 72, and therefore the seal I is not shown. Both are O-shaped rubber seal rings.

Claims

1. A lifting limiting device of a chain electric hoist, comprising a lifting limiting switch, a lowering limiting switch and a seat frame which is externally and detachably fixed to the bottom surface of the body of the chain electric hoist, characterized in that: The switch base cover is arranged on the switch base, the up-limiting switch and the down-limiting switch are respectively accommodated in the interiors of the switch base and the switch base cover, the top rod I and the top rod II are respectively located in the switch base and the switch base cover, the compression spring I is positioned by the switch base cover and the top rod I, and the compression spring II is positioned by the switch base cover and the top rod II, vertical through holes I and II are respectively arranged at two ends of the switch base, vertical through holes I and II are respectively arranged in the seat frame, the top rod I sequentially passes through the vertical through hole I and the vertical through hole I, the top rod II sequentially passes through the vertical through hole II and the vertical through hole II, the up-limiting switch and the down-limiting switch are respectively arranged between the top rod I and the top rod II, the flexible spring I is clamped on the up-limiting switch, and the free section of the flexible spring I is arranged between the radial pressing head I of the top rod I and the contact head of the up-limiting switch, the flexible spring II is clamped on the down-limiting switch, and the free section of the flexible spring II is arranged between the radial pressing head II of the top rod II and the contact head of the down-limiting switch.

2. The lifting limiter device of the electric chain hoist according to claim 1, characterized in that: The vertical through hole I is provided with a sealing piece I, and the vertical through hole II is provided with a sealing piece II, the inner hole of the sealing piece I is in contact with the side wall of the top rod I to achieve sealing, and the inner hole of the sealing piece II is in contact with the side wall of the top rod II to achieve sealing.

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