CN204570667U - Hand excavated pile aperture safety device - Google Patents

Abstract

The hole safety protection device for manual digging piles is designed for the safe construction of manual hole digging piles, and belongs to the field of construction; It is composed of a lifting device; wherein, the orifice safety protection net is composed of an orifice safety protection net column and an orifice safety protection mesh. The beneficial effect of the utility model is that it can prevent rainwater and falling objects from falling into the holes of the artificially-dug piles during the construction of the artificial-dug piles, which will injure the construction workers in the holes of the artificial-dug piles, and can ensure that the construction in the holes of the artificial-dug piles Job security.

Description

Hole safety protection device for manual digging piles

technical field

The hole safety protection device for manual hole-digging piles is designed for the safe construction of manual hole-digging piles, and belongs to the field of building construction.

Background technique

Due to the underground operation of manual excavation piles, there are many potential safety hazards; the main hidden dangers are:

1. The hole of the manual excavation pile is relatively hidden, and the personnel working on the ground are prone to fall accidents;

2. When working on the ground, it is easy to drop objects at the opening of the manual digging pile, which will hurt the underground workers;

3. Rainwater is easy to enter from the wellhead, and the water in the well is not easy to discharge, and the underground workers are prone to drowning;

4. The depth of manual excavation piles is relatively large, and hole collapse accidents are prone to occur;

5. The hoisting device used as a vertical transportation tool is easy to slip during operation, causing falling objects accidents.

These problems can be solved by adopting the utility model. The orifice safety protection net provided by the utility model can prevent the personnel working on the ground from falling accidents; the anti-falling concrete ring at the orifice can prevent objects from falling at the orifice of the manual digging pile, causing the underground workers to be injured; Prevent rainwater from entering from the wellhead; set up retaining walls to prevent hole collapse accidents; set up lifting devices and anti-skid gears to prevent the lifting device from slipping easily and cause falling objects accidents.

Utility model content

The specific approach of this program is:

As shown in Figure 1, the safety protection device for the opening of the artificial hole digging pile is composed of the opening safety protection net 1, the anti-falling concrete ring 2, the retaining wall 3 and the lifting device 4; wherein, the opening safety protection net 1 is composed of the hole Mouth safety protection net column 11 and orifice safety protection mesh cloth 12 are formed; the orifice anti-fall concrete ring 2 is on the ground above the hole of the manual digging pile, and the orifice safety net 1 is placed on the orifice anti-fall concrete ring 2 Above, the orifice safety net column 11 is embedded in the orifice anti-fall concrete circle 2; the orifice safety net cloth 12 is fixed on the orifice safety net column 11 along the periphery of the orifice safety net column 11 The orifice anti-fall concrete ring 2 is on the top of the retaining wall 3; the retaining wall 3 is arranged along the full length of the artificial excavation pile; the lifting device 4 is composed of a lifting device bracket 41, a lifting device central axis 42, a lifting device drum 43, and a lifting device sling 44. The lifting device rocker arm 45, the lifting device handle 46, the anti-slip gear 47 and the anti-slip lock 48 are composed; the lifting device 4 is arranged above the wellhead; The lifting device bracket 41 is consolidated; the lifting device roller 43 is installed in the middle of the lifting device central axis 42, and the lifting device central axis 42 passes through the center of the lifting device roller 43 parallel to the lifting device roller 43; one end of the lifting device soft rope 44 is fixed on the lifting device On the drum 43, and wound on the hoisting device drum 43, the other end hangs down into the wellhead of the artificially dug hole pile, and is connected with the soil frame; And on the outside of the lifting device bracket 41, it is consolidated with the lifting device axis 42; the lifting device handle 46 is perpendicular to the lifting device rocker arm 45, and is consolidated with the lifting device rocker arm 45; the center of the anti-skid gear 47 is connected with the lifting device axis 42 The center coincides with the center shaft 42 of the lifting device; the anti-skid lock 48 is located on one side of the anti-skid gear 47, and overlaps with the anti-skid gear 47. When overlapping, only the anti-skid gear 47 is allowed to rotate forward, and the anti-skid gear 47 is not allowed Reverse rotation, anti-skid gear 47 is allowed to rotate reversely when not overlapping.

Further, the orifice safety net column 11 is a rod-shaped component with strength, rigidity and stability, and it is recommended to use short steel pipes to make it, but not limited to only using materials; the orifice safety net column 11 is a fixed At the top of the anti-fall concrete ring 2 at the orifice, it is perpendicular to the wellhead plane during use. The orifice safety protection mesh 12 is a mesh part with reliable strength, and it is preferred to use a flat mesh to make it, but it is not limited to only using materials; through the orifice safety protection net post 11, the orifice safety protection mesh 12 is surrounded. On the top of the orifice anti-falling concrete ring 2, it is integrated with the orifice safety protection net column 11 to form the orifice safety protection net 1.

  The anti-fall concrete ring 2 for the hole opening is a reinforced concrete wellhead ring set up on the ground above the hole hole of the manual excavation pile. It is recommended to use concrete with a strength grade of not lower than C20 to make it, but not limited to only materials; reinforced concrete wellhead The inner diameter of the ring is not less than the design diameter of the artificial excavation pile, the height of the reinforced concrete wellhead ring should be exposed to the ground not less than 300mm, and the thickness of the reinforced concrete wellhead ring is not less than 200mm; the hole anti-fall concrete ring 2 and the retaining wall 3 Tightly consolidated and raised above the ground.

The manual digging pile retaining wall 3 is set during the manual digging process. The upper opening is small and the lower opening is large. It is a safety device to prevent the soil collapse of the manual digging pile hole wall. Once, it is preferred to use reinforced concrete with a strength grade of not less than C20, but not limited to only materials; the height of the pile retaining wall 3 is set once every time the excavation depth reaches 1 meter; the thickness of the pile retaining wall 3 is not less than 200 mm; the inner hole upper opening of pile retaining wall 3 is little, and the lower opening is big;

Further, the lifting device bracket 41 of the lifting device 4 is a supporting member of the lifting device 4 with sufficient strength and rigidity. The hoisting device support 41 on both sides of the artificial hole-digging pile aperture is connected as a whole.

Further, the central axis 42 of the lifting device is a rod system member with strength and rigidity, and it is recommended to be made of short steel pipes, but not limited to only using materials; the central axis 42 of the lifting device is parallel to the roller 43 of the lifting device, and Pass through the center of the hoisting device roller 43 and erect on the hoisting device bracket 41 on both sides of the wellhead; the central shaft 42 of the hoisting device is consolidated with the hoisting device bracket 41 through the bearing; Freely rotate on the hoisting device support 41 on both sides of the hole-digging pile aperture manually.

Further, the lifting device drum 43 is a cylindrical member with strength and rigidity, and it is recommended to be made of wood, but not limited to only using materials; the lifting device drum 43 is regularly wound with a lifting device rope 44 The hoisting device drum 43 freely rotates on the hoisting device support 41 erected on both sides of the artificial hole-digging pile aperture by the hoisting device central axis 42; when the hoisting device drum 43 is rotated in the forward direction, the hoisting device sling 44 is promoted; When the reverse rotation of the lifting device drum 43 is done, the lifting device sling 44 is lowered.

Further, the lifting device soft rope 44 is a tubular member with strength and toughness, and it is recommended to use hemp rope to make it, but it is not limited to only using materials; one end of the lifting device soft rope 44 is fixed on the lifting device roller 43 , with the positive rotation of the lifting device drum 43; the lifting device sling 44 is regularly wound on the lifting device drum 43, and when the lifting device drum 43 rotates in the reverse direction, the lifting device sling 44 regularly leaves the lifting device drum 43 , with the weight drooping into the hole of the artificial hole-digging pile.

Further, the rocker arm 45 of the lifting device is a rod system member with strength, rigidity and toughness; it is preferably recommended to be made of a steel plate with a length of 300 mm, a width of 40 mm, and a thickness of 8-10 high density, but is not limited to only using materials; One end of the device rocking arm 45 is vertically intersected with the lifting device central axis 42 and consolidated; one end of the lifting device rocking arm 45 is vertically intersected and consolidated with the lifting device handle 46; the lifting device rocking arm 45 is driven by the lifting device handle 46, Rotate around the central axis 42 of the lifting device, and also drive the central axis 42 of the lifting device to rotate together with the roller 43 of the lifting device.

Further, the lifting device handle 46 is a rod system member with strength, rigidity and toughness; it is preferably recommended to be made of steel with a length of 300 mm and a width of 40 mm, but it is not limited to only using materials; the lifting device handle 46 and the lifting device One end of the rocker arm 45 is vertically intersected and consolidated; the handle 46 of the lifting device is driven by an external force to drive the rocker arm 45 of the lifting device to rotate.

Further, the anti-skid gear 47 is a helical gear with strength, rigidity and toughness; the slope of the tooth of the anti-skid gear 47 is tangent to the gear arc, and the other side of the tooth of the anti-skid gear 47 intersects perpendicularly with the gear arc; the anti-skid gear The center of 47 coincides with the center of the shaft 42 of the lifting device, and vertically intersects and consolidates; when the shaft 42 of the lifting device rotates, the anti-skid gear 47 also rotates thereupon; When the shaft 42 of the lifting device rotates in the forward direction, the anti-skid lock 48 is dragged on the slope of the anti-skid gear 47 .

Further, the anti-slip lock 48 is a wedge-shaped member with strength, rigidity and toughness; it is preferably recommended to be made of flat steel with a length of 300 mm, a width of 40 mm, and a thickness of 3 mm, but it is not limited to only materials; the anti-slip lock 48 One end is fixed on the lifting device bracket 41, and the other end is built on the slope of the anti-skid gear 47. Under the action of external force, the end built on the slope of the anti-skid gear 47 can be lifted and put down. The fixed shaft rotates; when the shaft 42 of the lifting device rotates in the forward direction, the anti-skid lock 48 is dragged on the slope of the anti-skid gear 47; The rotation of anti-skid gear 47 is stopped on the vertical surface of 47; can rotate freely.

The beneficial effect of the utility model is that it can prevent rainwater and falling objects from falling into the holes of the artificially dug piles during the construction of the artificially dug piles, which will injure the construction workers in the holes of the manually dug piles, and can ensure that the construction in the holes of the manually dug holes Job security.

Description of drawings

Fig. 1 Schematic diagram of the 1-1 cross-section of the safety protection device for the opening of the manual excavation pile;

Figure 2 Plane schematic diagram of the safety protection device for the opening of the manual excavation pile;

In the figure: 1-hole safety protection net; 11-hole safety protection net column; 12-hole safety protection mesh; 2-hole anti-fall concrete ring; 3-manual digging pile wall; 4-excavation Lifting device; 41-lifting device bracket; 42-lifting device center shaft; 43-lifting device roller; 44-lifting device rope; 45-lifting device rocker arm; 46-lifting device handle; 47-anti-skid gear; lock.

Detailed ways

Example

As shown in Figure 1 and Figure 2 of a certain project, the safety protection device for the hole opening of the manual excavation pile is composed of the safety protection net 1 for the hole, the anti-fall concrete ring 2 for the hole, the retaining wall 3 and the lifting device 4; among them, the hole safety The protective net 1 is made up of the orifice safety net column 11 and the orifice safety net cloth 12; the orifice anti-fall concrete ring 2 is at the ground above the artificial digging pile orifice, and the orifice safety net 1 is at the orifice On the top of the anti-fall concrete circle 2, the orifice safety protection net column 11 is embedded in the orifice anti-fall concrete circle 2; the orifice safety protection mesh 12 is fixed on the orifice safety net column 11 periphery On the protective net column 11; the orifice anti-fall concrete ring 2 is on the top of the retaining wall 3; the retaining wall 3 is arranged along the entire length of the artificial excavation pile; the lifting device 4 is composed of a lifting device bracket 41, a lifting device central axis 42, and a lifting device roller 43 , lifting device rope 44, lifting device rocker arm 45, lifting device handle 46, anti-slip gear 47 and anti-slip lock 48; 41 is consolidated with the lifting device bracket 41 by the bearing; the lifting device roller 43 is installed in the middle of the lifting device central axis 42, and the lifting device central axis 42 passes through the center of the lifting device roller 43 parallel to the lifting device roller 43; the lifting device soft rope 44 One end is fixed on the hoisting device drum 43 and wound on the hoisting device drum 43, and the other end hangs down into the wellhead of the artificial excavation pile and is connected with the soil frame; the hoisting device rocker arm 45 is perpendicular to the hoisting device central axis 42, One end of axle 42, and in the outside of lifting device support 41, consolidate with lifting device central axis 42; The center of the central axis 42 of the lifting device coincides with the central axis 42 of the lifting device; the anti-skid lock 48 is located on one side of the anti-skid gear 47, and overlaps with the anti-skid gear 47. When overlapping, only the anti-skid gear 47 is allowed to rotate forward. The anti-skid gear 47 is not allowed to rotate in reverse, and the anti-skid gear 47 is allowed to rotate in reverse when not overlapping.

Orifice safety protection net column 11 is that tool adopts short steel pipe to make, and orifice safety protection net column 11 is fixed on the anti-falling concrete circle 2 tops of orifice, and vertical with wellhead plane during use.

The orifice safety protection net 12 is to adopt flat net to make, through the orifice safety protection net column 11, the orifice safety protection net 12 is surrounded on the top of the orifice anti-falling concrete ring 2, and the orifice safety protection net column 11 Consolidate into a whole to form a safety protection net 1 for the orifice.

The anti-fall concrete ring 2 of the hole opening is a reinforced concrete wellhead ring set up on the ground above the hole of the manual digging pile, and is made of concrete with a strength grade not lower than C20. The design diameter and the height of the reinforced concrete wellhead ring should be no less than 300mm above the ground, and the thickness of the reinforced concrete wellhead ring should be no less than 200mm;

The manual digging pile retaining wall 3 is installed during the manual digging process, and is made of reinforced concrete with a strength grade not lower than C20. The height of the pile retaining wall 3 is set once every time the excavation depth reaches 1 meter; The thickness is not less than 200 mm; the upper opening of the inner hole of the pile retaining wall 3 is small, and the lower opening is large; the pile retaining wall 3 is set from top to bottom, until the excavation reaches the expanding head of the manual digging hole, and the retaining wall 3 is always above the expanding head .

The hoist support 41 is made of a short steel pipe, and the hoist support 41 that is arranged on both sides of the artificial hole-digging pile aperture is connected as a whole by the hoist central axis 42 .

The central shaft 42 of the hoist is made of a short steel pipe, the central shaft 42 of the hoist is parallel to the drum 43 of the hoist, passes through the center of the drum 43 of the hoist, and is erected on the brackets 41 of the hoist on both sides of the wellhead; the central shaft of the hoist 42 is consolidated with the lifting device support 41 by bearing; the lifting device central axis 42 can drive the lifting device cylinder 43 to rotate freely on the lifting device support 41 erected on both sides of the artificial hole-digging pile aperture through the bearing.

The hoisting device drum 43 is made of wood, and the hoisting device soft rope 44 is regularly wound on the hoisting device drum 43; Free rotation on the support 41; when the hoisting device drum 43 was doing forward rotation, the hoisting device sling 44 was promoted; when the hoisting device drum 43 was doing reverse rotation, the hoisting device sling 44 was lowered.

Lifting device soft rope 44 is to adopt hemp rope to make, but is not limited to only adopting material to make; One end of lifting device flexible rope 44 is affixed on the lifting device drum 43, along with the forward rotation of lifting device drum 43; 44 is wound on the hoisting device drum 43 regularly, and when the hoisting device drum 43 was doing reverse rotation, the hoisting device sling 44 regularly left the hoisting device drum 43, and drooped in the artificial hole-digging pile aperture along with the weight.

Lifting device rocking arm 45 is to adopt long 300 millimeters wide 40 millimeters, thick 8-10 high-density steel plate is made, and one end of lifting device rocking arm 45 intersects vertically with lifting device central axis 42 and consolidates; The lifting device handle 46 intersects vertically and is consolidated; the lifting device rocker arm 45 is driven by the lifting device handle 46 to rotate around the lifting device central axis 42, and also drives the lifting device central axis 42 to rotate together with the lifting device roller 43.

Lifting device handle 46 is to adopt the Yuan steel of 300 millimeters in length and 40 millimeters in width to make, and one end of lifting device handle 46 and lifting device rocking arm 45 vertically intersects and consolidates; Lifting device handle 46 drives the lifting device rocking arm 45 spins.

The anti-skid gear 47 is a helical gear with sufficient strength, rigidity and toughness; the slope of the tooth of the anti-skid gear 47 is tangent to the gear arc, and the other side of the tooth of the anti-skid gear 47 intersects perpendicularly with the gear arc; the anti-skid gear 47 The center of the center coincides with the center of the shaft 42 of the lifting device, and vertically intersects and consolidates; when the shaft 42 of the lifting device rotates, the anti-skid gear 47 also rotates thereupon; When the shaft 42 of the lifting device rotates in the forward direction, the anti-skid lock 48 is dragged on the slope of the anti-skid gear 47 .

The anti-skid lock 48 is made of flat steel with a length of 300 mm, a width of 40 mm, and a thickness of 3 mm. One end of the anti-slip lock 48 is fixed on the lifting device support 41, and the other end is built on the slope of the anti-skid gear 47. Under the action of external force, One end built on the slope of the anti-skid gear 47 can be lifted and put down, and can rotate around the fixed axis when lifted; When the shaft 42 of the lifting device rotates in the opposite direction, the anti-skid lock 48 is against the vertical surface of the anti-skid gear 47 to stop the rotation of the anti-skid gear 47; under the action of external force, the anti-skid lock 48 is lifted to make it When leaving the vertical surface of the anti-skid gear 47, the anti-skid gear 47, the lifting device central axis 42 and the lifting device cylinder 43 just can rotate freely.

Claims (10)

1. The safety protection device for the opening of the artificial hole-digging pile is characterized in that the safety protection device consists of the opening safety protection net (1), the anti-falling concrete ring (2), the retaining wall (3) and the lifting device (4 ); Among them, the orifice safety net (1) is composed of the orifice safety net column (11) and the orifice safety net (12); the orifice anti-fall concrete ring (2) is manually dug On the ground above the hole of the pile, the hole safety net (1) is above the hole anti-fall concrete ring (2), and the hole safety net column (11) is embedded in the hole anti-fall concrete ring (2) Middle; the orifice safety protection mesh cloth (12) is fixed on the orifice safety protection net column (11) along the periphery of the orifice safety protection net column (11); ); the retaining wall (3) is arranged along the length of the artificial excavation pile; the lifting device (4) consists of a lifting device bracket (41), a lifting device center shaft (42), a lifting device roller (43), and a lifting device soft cable (44), lifting device rocker arm (45), lifting device handle (46), anti-slip gear (47) and anti-slip lock (48); the lifting device (4) is arranged above the wellhead; the central axis of the lifting device (42 ) are respectively supported on the lifting device bracket (41) through bearings and the lifting device bracket (41) are consolidated; the lifting device roller (43) is installed in the middle of the lifting device central axis (42), and the lifting device central axis (42) is lifting The center of the device roller (43) passes parallel to the lifting device roller (43); one end of the lifting device sling (44) is fixed on the lifting device roller (43) and wound on the lifting device roller (43), and the other end hangs down Enter the wellhead of the artificial excavation pile, and connect with the soil frame; the rocker arm (45) of the lifting device is perpendicular to the central axis (42) of the lifting device, at one end of the central axis (42) of the lifting device, and outside the bracket (41) of the lifting device , is consolidated with the central axis (42) of the lifting device; the handle (46) of the lifting device is perpendicular to the rocker arm (45) of the lifting device, and is consolidated with the rocker arm (45) of the lifting device; the center of the anti-skid gear (47) is connected with the The center of the shaft (42) coincides with the center shaft (42) of the lifting device; the anti-skid lock (48) is located on one side of the anti-skid gear (47), and overlaps with the anti-skid gear (47). The anti-skid gear (47) rotates forward, does not allow the anti-skid gear (47) to rotate reversely, and allows the anti-skid gear (47) to rotate reversely when not overlapping. 2. The hole safety protection device for manual hole-digging piles according to claim 1, characterized in that the hole safety net column (11) is fixed on the upper part of the hole anti-fall concrete circle (2), and has strength, Rigid and stable rod-shaped parts, which are perpendicular to the wellhead plane when in use; the orifice safety protection mesh (12) is a mesh-shaped part with reliable strength, passing through the orifice safety protection net column (11) and surrounding the orifice The upper part of the anti-fall concrete ring (2) is consolidated with the orifice safety protection net column (11) into a whole to form the orifice safety protection net (1); The reinforced concrete wellhead ring set up on the ground above the orifice is tightly consolidated with the retaining wall (3) and is higher than the ground; the retaining wall (3) is set during the manual digging process, and the upper opening is small and the lower opening is large to prevent The safety device for manual digging pile hole wall soil collapse, in the process of manual digging, the wall protection must be done every time a section is dug, until the expansion head of the manual digging hole is excavated, and the protection wall (3) is always above the expansion head. 3. The hole safety protection device for artificial hole-digging piles according to claim 1, characterized in that the lifting device bracket (41) of the lifting device (4) is a supporting member of the lifting device (4) with strength and rigidity, The lifting device brackets (41) supported on both sides of the artificial hole-digging pile hole are connected into a whole through the lifting device central axis (42). 4. The hole safety protection device for manual hole-digging piles according to claim 1, characterized in that the lifting device central axis (42) of the lifting device (4) is a rod system member with strength and rigidity, and the lifting device central axis ( 42) Parallel to the hoisting device roller (43), pass through the center of the hoisting device roller (43), erect on the hoisting device brackets (41) on both sides of the wellhead, consolidate with the hoisting device bracket (41) through the bearing, and pass through the bearing Can drive hoisting device cylinder (43) to freely rotate on the hoisting device support (41) that is erected on both sides of artificial digging pile aperture. 5. The hole safety protection device for manual hole-digging piles according to claim 1, characterized in that the lifting device roller (43) of the lifting device (4) is a cylinder member with strength and rigidity, and the lifting device roller (43 ) is regularly wound with hoisting device soft ropes (44), and freely rotates on the hoisting device brackets (41) erected on both sides of the hole of the artificial excavation pile through the hoisting device central axis (42); the hoisting device roller (43) When the positive rotation is done, the hoisting device soft rope (44) is promoted; when the hoisting device drum (43) is reversely rotated, the hoisting device soft rope (44) is lowered. 6. The hole safety protection device for manual hole-digging piles according to claim 1, characterized in that the hoisting device rope (44) of the hoisting device (4) is a tubular member with strength and toughness, and the hoisting device rope (44) One end of (44) is fixed on the lifting device roller (43), and with the positive rotation of the lifting device roller (43), the lifting device soft rope (44) is regularly wound on the lifting device roller (43), lifting When the device drum (43) was doing reverse rotation, the hoisting device sling (44) regularly left the hoisting device drum (43), and drooped into the hole of the artificial hole-digging pile along with the weight. 7. The hole safety protection device for artificial hole-digging piles according to claim 1, characterized in that the lifting device rocker (45) of the lifting device (4) is a rod system member with strength, rigidity and toughness; the lifting device One end of the rocker arm (45) is vertically intersected with the central axis (42) of the lifting device and consolidated, and one end of the rocker arm (45) of the lifting device is vertically intersected and fixed with the handle (46) of the lifting device; the rocker arm of the lifting device (45) Driven by the lifting device handle (46), it rotates around the lifting device central axis (42), and also drives the lifting device central axis (42) to rotate together with the lifting device roller (43). 8. The hole safety protection device for manual hole-digging piles according to claim 1, characterized in that the lifting device handle (46) of the lifting device (4) is a rod system member with strength, rigidity and toughness; the lifting device handle (46) perpendicularly intersects with one end of the lifting device rocker arm (45) and is consolidated; the lifting device handle (46) is driven by external force to drive the lifting device rocker arm (45) to rotate. 9. The hole safety protection device for manual hole-digging piles according to claim 1, characterized in that the anti-skid gear (47) of the lifting device (4) is a helical gear with strength, rigidity and toughness; the anti-skid gear (47) The slope of the tooth is tangent to the arc of the gear, and the other side of the tooth of the anti-skid gear (47) intersects the arc of the gear perpendicularly; the center of the anti-skid gear (47) coincides with the center of the shaft (42) of the lifting device and intersects vertically And consolidated; when the shaft (42) of the lifting device rotates, the anti-skid gear (47) also rotates thereupon; When positive rotation occurs, the anti-skid lock (48) drags on the slope of the anti-skid gear (47). 10. The hole safety protection device for manual hole-digging piles according to claim 1, characterized in that the anti-slip lock (48) of the lifting device (4) is a wedge-shaped member with strength, rigidity and toughness; the anti-slip lock ( One end of 48) is fixed on the lifting device bracket (41), and the other end is set on the slope of the anti-skid gear (47). It can be put down, and when lifted, it can rotate around the fixed axis; when the central axis (42) of the lifting device rotates forward, the anti-skid lock (48) drags on the slope of the anti-skid gear (47); when the central axis of the lifting device (42) When the reverse rotation occurs, the anti-skid lock (48) is against the vertical surface of the anti-skid gear (47) to stop the rotation of the anti-skid gear (47); under the action of external force, lift the anti-skid lock (48), so that When leaving the vertical surface of anti-skid gear (47), anti-skid gear (47), hoisting device axis (42) and hoisting device cylinder (43) just can rotate freely.