CN118653681A - Horse stool for reducing the conveying resistance of ground pump concrete and its use method - Google Patents

Abstract

The present invention provides a horse stool for reducing the conveying resistance of a ground pump concrete and a method for using the same. A first slide rail is provided on the bottom frame of a frame body, a support bracket is slidably connected to the first slide rail, a pump pipe sleeve is arranged in the support bracket, vibration reduction mechanisms are symmetrically provided on both sides of the support bracket, one end of the vibration reduction mechanism is connected to the support bracket base, and the other end is connected to the frame body, the pump pipe passes through the frame body and reciprocates along the first slide rail, a transmission mechanism and a rotating bracket are provided at the end of the pump pipe, a sleeve moving mechanism is provided above the support bracket, and a universal wheel and a hydraulic cylinder are provided below the frame body, so as to solve the problems of large pumping friction resistance and impact force, displacement of the template surface, affecting product quality, large labor consumption in carrying the horse stool and the pump pipe, and non-recyclable horse stool.

Description

Horse stool for reducing the conveying resistance of ground pump concrete and its use method

Technical Field

The invention relates to the technical field of building construction devices, in particular to a horse stool for reducing the conveying resistance of a ground pump concrete and a use method thereof.

Background Art

In the field of domestic construction engineering, with the acceleration of urbanization and the increasing shortage of land resources, high-rise buildings have become the mainstream building form. In this context, the main method of concrete delivery is pumping, which is widely used due to its high efficiency and speed. However, during the pumping process, the problem of supporting the delivery pump pipe gradually becomes prominent.

According to the traditional construction method, the concrete delivery pump pipe is usually supported on the formwork surface where concrete has not yet been poured through an ordinary horse stool. Most of these horse stools are simple structures welded by on-site steel bars. Although they are easy to make, they have many problems in actual use. First of all, since the concrete will be affected by the movement of the delivery pump piston during the delivery process, a certain horizontal thrust will be generated, and this force will directly act on the formwork surface. However, the traditional simple horse stools often cannot provide sufficient stability and support, which makes the formwork and its bracket easily produce horizontal displacement in the forward direction, thereby affecting the quality and molding effect of concrete pouring. Secondly, these simple horse stools used on the construction site are usually not recyclable. Once the construction is completed, these horse stools are regarded as waste materials for disposal, which not only causes a great waste of resources, but also increases the environmental burden during the construction process. In the context of the increasingly popular concept of green environmental protection, this phenomenon of resource waste needs to be improved urgently.

Therefore, in view of the problems existing in the concrete pumping process of high-rise buildings, it is particularly important to seek a new pump pipe support solution that can both ensure construction quality and save resources. Such a solution can not only improve construction efficiency and quality level, but also promote the construction of construction projects in a greener and more environmentally friendly direction.

Summary of the invention

The main purpose of the present invention is to provide a horse stool for reducing the conveying resistance of ground pump concrete and a method of using the same, so as to solve the problems of large pumping friction and impact force, which cause displacement of the template surface and affect product quality, large manpower consumption in carrying the horse stool and pump pipe, and the non-recyclability of the horse stool.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a horse stool for reducing the resistance of ground pump concrete transportation, a first slide rail is provided on the bottom frame of the frame, the support bracket is slidably connected to the first slide rail, the pump pipe sleeve is arranged in the support bracket, and vibration reduction mechanisms are symmetrically provided on both sides of the support bracket, one end of the vibration reduction mechanism is connected to the support bracket base, and the other end is connected to the frame, and the pump pipe passes through the frame and reciprocates along the first slide rail.

In the preferred embodiment, the structure of the frame is as follows: vertical poles are provided above the four corners of the bottom frame, the four vertical poles are all inclined inward at the same angle and are respectively connected to the four corners of the top frame, a cover plate is provided on the top frame, and a cross bar is vertically provided between two adjacent vertical poles on the short side of the bottom frame.

In the preferred embodiment, two first slide rails are symmetrically arranged between the two long sides of the bottom frame, and both ends of the support and hanger base are slidably connected to the first slide rails through first sliders;

The structure of the support bracket is as follows: two semicircular pipe sleeves are provided on the support bracket base, first connecting plates are provided at the arc ends on both sides of the pipe sleeves, multiple supporting ribs are provided between the pipe sleeves and the support bracket base, and the bracket rubber pad sleeve is provided between the pipe sleeves and the pump pipe.

In the preferred embodiment, the structure of the vibration reduction mechanism is as follows: the damper is sleeved in the first elastic member, one end of the first elastic member is connected to the support bracket base, and the other end is connected to the middle part of the damper cylinder body, the movable end of the damper is connected to the support bracket base, and the other end is connected to the cross bar.

In the preferred embodiment, a transmission mechanism is provided on a cross bar on one side of the frame body, and the structure of the transmission mechanism is as follows: the lower end of the guide bracket is connected to the cross bar, the support arms at both ends of the guide bracket are respectively rotatably connected to the two gear shafts, the conveyor belt passes around the gear shafts at both ends, and the inner toothed structure is meshed with the gear shafts, a guide block is provided at the upper end of the support arm, and the pump pipe is arranged on the conveyor belt between the guide blocks on both sides;

A first motor is provided on one side of the conveying mechanism, and a driving gear is provided at the output end of the first motor, which extends into between two gear shafts in the conveying belt and meshes with the conveying belt to drive the upper plane of the conveying belt to move radially along the pump pipe.

In the preferred embodiment, a second slide rail is provided on the cross bar below the first motor, the lower surface of the first motor is slidably connected to the second slide rail through a second slider, the fixed end of the first motor is connected to the frame through a second elastic member, and a first cylinder is provided on the other side of the conveying mechanism. The output shaft of the first cylinder is coaxially opposite to the output shaft of the first motor, driving the first motor to slide along the second slide rail, so that the driving gear leaves the inner surface range of the conveyor belt.

In the preferred embodiment, a second cylinder is provided above the support and hanger, and the output shaft of the second cylinder is provided with a shaft end thread, a threaded sleeve is provided at the top of the pipe sleeve of the upper part of the support and hanger, and the shaft end thread is threadedly connected with the threaded sleeve, the top of the second cylinder body is connected with one end of the rotating shaft, a worm gear is provided in the middle of the rotating shaft, and the other end of the rotating shaft is rotatably connected with the top cover plate of the frame body, a second motor is provided on one side of the rotating shaft, and a bearing seat is provided on the other side, the worm is meshed with the worm gear, and one end is connected to the output shaft of the second motor, and the other end is rotatably connected to the bearing seat, and the second cylinder and the second motor jointly drive the shaft end thread to rotate and press down to connect with the sleeve.

In the preferred embodiment, a rotating bracket is provided on the cross bar on the other side of the frame body, the base is connected to the cross bar, the rotating frame is rotatably connected to the base, the rotating frame is arc-shaped, and the outer surface of the pump tube end abuts against the rotating frame.

In the preferred embodiment, the bottom four corners of the bottom frame are connected to the universal wheel through a second connecting plate. A hydraulic cylinder is provided on the outside of the universal wheel. The hydraulic cylinder is connected to the second connecting plate through a connecting pipe sleeve. A circular support pad is provided at the end of the output shaft of the hydraulic cylinder, and an anti-slip coating is provided on the lower surface of the support pad.

In a preferred embodiment, the method comprises:

S1, the second cylinder is connected to the upper pipe sleeve of the support and hanger and is in the initial position;

S2, the hydraulic cylinder is at the initial position. After the frame moves to the construction point, the hydraulic cylinder presses down and the universal wheel leaves the ground;

S3, the first cylinder is at the initial position, and the transmission mechanism moves the pump pipe to the fixed point of the support and hanger;

S4, the second cylinder is pressed down, and after the upper and lower pipe sleeves of the support and hanger are connected and locked, the second cylinder rotates and retracts to the initial position;

S5, the first cylinder pushes the driving gear to leave the inner surface of the conveyor belt;

S6. Start pumping concrete.

The present invention provides a horse stool for reducing the conveying resistance of ground pump concrete and a method for using the horse stool. The pump pipe is sleeved in a support and hanger, the support and hanger are slidably connected to a first slide rail, and vibration reduction mechanisms are symmetrically arranged on both sides of the support and hanger, so that the pump pipe vibrates horizontally along the first slide rail, and at the same time, a driving gear in the conveying mechanism leaves the inner surface range of the conveyor belt, and the conveyor belt supports the pump pipe and moves with the vibration of the pump pipe, and a rotating bracket on the other side supports the pump pipe and rotates with the vibration of the pump pipe, and an anti-skid coating is arranged on the lower surface of the support pad of the hydraulic cylinder, so as to solve the problem that the pumping friction resistance and impact force are large, the template surface is displaced, and the product quality is affected;

Universal wheels and hydraulic cylinders are arranged under the frame, which can move the frame to the construction site and then park it. The transmission mechanism moves the pump pipe to the support bracket, and the second cylinder and the second motor cooperate to move the pipe sleeve, thereby solving the problems of high manpower consumption in carrying the horse stool and pump pipe and the horse stool cannot be recycled.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

Fig. 1 is a front view of the overall structure of the present invention;

Fig. 2 is a side view of the overall structure of the present invention;

Fig. 3 is an axonometric view of the overall structure of the present invention;

FIG4 is an axonometric view of the frame structure of the present invention;

FIG5 is an axonometric view of the pump pipe movable support structure of the present invention;

6 is a front view of the vibration reduction mechanism of the present invention;

7 is a side structural diagram of the transmission mechanism of the present invention;

8 is a top cross-sectional structural diagram of the transmission mechanism of the present invention;

9 is an axonometric structural diagram of the guide bracket of the present invention;

10 is a front structural diagram of the sleeve and the sleeve moving mechanism of the present invention;

11 is an axonometric structural diagram of the sleeve moving mechanism of the present invention;

12 is a schematic diagram of the support and hanger structure of the present invention;

13 is an axonometric structural diagram of the rotating bracket of the present invention;

FIG. 14 is a schematic diagram of the universal wheel and hydraulic cylinder installation structure of the present invention.

In the figure: frame 1; bottom frame 101; cross bar 102; cover plate 103; vertical bar 104; top frame 105; first slide rail 2; support bracket 3; support bracket base 301; pipe sleeve 302; threaded pipe sleeve 3021; support rib plate 303; first connecting plate 304; pump pipe 4; vibration reduction mechanism 5; first elastic member 501; damper 502; first slider 6; bracket rubber pad 7; transmission mechanism 8; guide bracket 801; support arm 8011; guide block 801 2; gear shaft 802; transmission belt 803; first motor 9; driving gear 901; second slide rail 10; second slider 11; second elastic member 12; first cylinder 13; second cylinder 14; shaft end thread 1401; rotating shaft 15; worm gear 16; second motor 17; bearing seat 18; worm 19; rotating bracket 20; base 2001; rotating frame 2002; second connecting plate 21; universal wheel 22; hydraulic cylinder 23; connecting sleeve 24; support pad 25.

DETAILED DESCRIPTION

Example 1

As shown in Figures 1 to 14, a horse stool for reducing the resistance of ground pump concrete transportation is provided. A first slide rail 2 is provided on the bottom frame 101 of the frame body 1, and a support bracket 3 is slidably connected to the first slide rail 2. A pump pipe 4 is sleeved in the support bracket 3. Vibration reduction mechanisms 5 are symmetrically provided on both sides of the support bracket 3. One end of the vibration reduction mechanism 5 is connected to the support bracket base 301, and the other end is connected to the frame body 1. The pump pipe 4 passes through the frame body 1 and reciprocates along the first slide rail 2.

In the preferred embodiment, the structure of the frame 1 is as follows: vertical poles 104 are arranged above the four corners of the bottom frame 101, the four vertical poles 104 are all inclined inward at the same angle, and are respectively connected to the four corners of the top frame 105, a cover plate 103 is arranged on the top frame 105, and a horizontal pole 102 is vertically arranged between two adjacent vertical poles 104 on the short side of the bottom frame 101, so that the structure of the frame 1 is firm and stable.

In the preferred embodiment, two first slide rails 2 are symmetrically arranged between the two long sides of the bottom frame 101, and both ends of the support and hanger base 301 are slidably connected to the first slide rails 2 through the first sliders 6;

The structure of the support and hanger 3 is as follows: two semicircular pipe sleeves 302 are provided on the support and hanger base 301, first connecting plates 304 are provided at the ends of the circular arcs on both sides of the pipe sleeves 302, a plurality of supporting ribs 303 are provided between the pipe sleeves 302 and the support and hanger base 301, and the support rubber pad 7 is sleeved between the pipe sleeves 302 and the pump pipe 4. The horizontal displacement of the support and hanger 3 acting on the frame 1 is offset by the sliding device, and the support rubber pad 7 reduces the vibration impact between the pipe sleeves 302 and the pump pipe 4.

In the preferred embodiment, the structure of the vibration reduction mechanism 5 is as follows: the damper 502 is sleeved in the first elastic member 501, one end of the first elastic member 501 is connected to the support bracket base 301, and the other end is connected to the middle of the cylinder of the damper 502, the movable end of the damper 502 is connected to the support bracket base 301, and the other end is connected to the cross bar 102. The spring damping systems on both sides absorb the impact force together to reduce vibration.

In the preferred embodiment, a conveying mechanism 8 is provided on the cross bar 102 on one side of the frame body 1, and the structure of the conveying mechanism 8 is as follows: the lower end of the guide bracket 801 is connected to the cross bar 102, the support arms 8011 at both ends of the guide bracket 801 are respectively rotatably connected to the two gear shafts 802, the conveyor belt 803 passes around the gear shafts 802 at both ends, and the inner toothed structure is meshed with the gear shafts 802, the upper end of the support arm 8011 is provided with a guide block 8012, and the pump tube 4 is arranged on the conveyor belt 803, between the guide blocks 8012 on both sides;

A first motor 9 is provided on one side of the conveying mechanism 8, and a driving gear 901 is provided at the output end of the first motor 9, which extends into between two gear shafts 802 in the conveying belt 803 and meshes with the conveying belt 803, driving the upper plane of the conveying belt 803 to move radially along the pump tube 4. The conveying mechanism 8 transports the pump tube 4 to a designated point in the support bracket 3, reducing the manpower consumption of carrying the pump tube, and the guide bracket 801 further limits the horizontal displacement of the pump tube 4.

In the preferred embodiment, a second slide rail 10 is provided on the cross bar 102 below the first motor 9, the lower surface of the first motor 9 is slidably connected to the second slide rail 10 through a second slider 11, the fixed end of the first motor 9 is connected to the frame 1 through a second elastic member 12, and a first cylinder 13 is provided on the other side of the transmission mechanism 8, the output shaft of the first cylinder 13 is coaxially arranged opposite to the output shaft of the first motor 9, and the first motor 9 is driven to slide along the second slide rail 10, so that the driving gear 901 leaves the inner surface range of the conveyor belt 803. During pumping, the transmission mechanism 8 is in a free moving state, providing support to the end of the pump pipe 4 while moving with the vibration of the pump pipe 4, absorbing horizontal impact force and reducing vibration.

In the preferred embodiment, a second cylinder 14 is provided above the support and hanger 3, and an output shaft of the second cylinder 14 is provided with an axial end thread 1401, and a threaded sleeve 3021 is provided at the top of the sleeve 302 of the upper part of the support and hanger 3, and the axial end thread 1401 is threadedly connected with the threaded sleeve 3021, and the top of the cylinder body of the second cylinder 14 is connected with one end of the rotating shaft 15, and a worm gear 16 is provided in the middle of the rotating shaft 15, and the other end of the rotating shaft 15 is rotatably connected with the top cover plate 103 of the frame body 1, and a second motor 17 is provided on one side of the rotating shaft 15, and a bearing seat 18 is provided on the other side, and the worm 19 is meshed with the worm gear 16, and one end is connected with the output shaft of the second motor 17, and the other end is rotatably connected with the bearing seat 18, and the second cylinder 14 and the second motor 17 jointly drive the axial end thread 1401 to rotate and press down to connect with the sleeve 302. The second cylinder 14 and the second motor 17 work together to move the sleeve 302, reducing manpower consumption.

In the preferred embodiment, a rotating bracket 20 is provided on the cross bar 102 on the other side of the frame body 1, the base 2001 is connected to the cross bar 102, the rotating bracket 2002 is rotatably connected to the base 2001, the rotating bracket 2002 is arc-shaped, and the outer surface of the end of the pump tube 4 abuts against the rotating bracket 2002. While providing support for the end of the pump tube 4, it rotates slightly with the vibration of the pump tube 4, absorbs horizontal impact force, and reduces vibration.

In the preferred solution, the bottom corners of the bottom frame 101 are connected to the universal wheels 22 through the second connecting plates 21, and a hydraulic cylinder 23 is provided on the outer side of the universal wheels 22. The hydraulic cylinder 23 is connected to the second connecting plate 21 through the connecting pipe sleeve 24. A circular support pad 25 is provided at the end of the output shaft of the hydraulic cylinder 23, and an anti-skid coating is provided on the lower surface of the support pad 25. The frame 1 can be moved to the construction site and parked, reducing the manpower consumption of carrying the horse stool, and can be reused at different work sites. The anti-skid surface of the support pad 25 increases the parking stability of the frame 1.

Example 2

Further described in conjunction with Example 1, as shown in Figures 1 to 14, the method includes:

S1, the second cylinder 14 is connected to the upper pipe sleeve 302 of the support bracket 3 and is in the initial position;

S2, the hydraulic cylinder 23 is at the initial position, and after the frame 1 moves to the construction point, the hydraulic cylinder 23 is pressed down, and the universal wheel 22 leaves the ground;

S3, the first cylinder 13 is at the initial position, and the conveying mechanism 8 moves the pump pipe 4 to the fixed point of the support bracket 3;

S4, the second cylinder 14 is pressed down, and after the upper and lower half pipe sleeves 302 of the support and hanger 3 are connected and locked, the second cylinder 14 rotates and retracts to the initial position;

S5, the first cylinder 13 pushes the driving gear 901 to leave the inner surface of the conveyor belt 803;

S6. Start pumping concrete.

The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims (10)

1. The split heads for reducing the concrete conveying resistance of the ground pump is characterized in that: be equipped with first slide rail (2) on bottom frame (101) of support body (1), prop up gallows (3) and first slide rail (2) sliding connection, pump line (4) cover are established in prop up gallows (3), prop up gallows (3) bilateral symmetry and be equipped with damping mechanism (5), damping mechanism (5) one end is connected with prop up gallows base (301), and the other end is connected with support body (1), and pump line (4) pass support body (1) along first slide rail (2) reciprocating motion.

2. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 1, wherein: the structure of the frame body (1) is as follows: the top of the four corners of the bottom layer frame (101) is provided with upright posts (104), the four upright posts (104) are all inclined inwards by the same angle and are respectively connected with the four corners of the top layer frame (105), the top layer frame (105) is provided with a cover plate (103), and a cross rod (102) is vertically arranged between two adjacent upright posts (104) of the short side of the bottom layer frame (101).

3. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 1, wherein: two first sliding rails (2) are symmetrically arranged in parallel between two long sides on the bottom layer frame (101), and two ends of the support and hanger base (301) are in sliding connection with the first sliding rails (2) through first sliding blocks (6);

The structure of the supporting and hanging bracket (3) is as follows: two semicircular arc-shaped pipe sleeves (302) are arranged on the support and hanger base (301), first connecting plates (304) are arranged at the circular arc tail ends of two sides of the pipe sleeves (302), a plurality of support rib plates (303) are arranged between the pipe sleeves (302) and the support and hanger base (301), and support rubber gaskets (7) are sleeved between the pipe sleeves (302) and the pump pipes (4).

4. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 1, wherein: the structure of the vibration reduction mechanism (5) is as follows: the damper (502) is sleeved in the first elastic piece (501), one end of the first elastic piece (501) is connected with the support and hanger base (301), the other end of the first elastic piece is connected with the middle part of the cylinder body of the damper (502), the movable end of the damper (502) is connected with the support and hanger base (301), and the other end of the damper is connected with the cross rod (102).

5. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 1, wherein: be equipped with transport mechanism (8) on frame body (1) one side horizontal pole (102), the structure of transport mechanism (8) is: the lower end of the guide bracket (801) is connected with the cross rod (102), two ends of the guide bracket (801) are respectively and rotatably connected with two gear shafts (802), the conveyor belt (803) bypasses the two gear shafts (802), the inner toothed structure is meshed with the gear shafts (802), the upper end of the support arm (8011) is provided with a guide block (8012), a pump pipe (4) is arranged on the conveyor belt (803), and the guide blocks (8012) are arranged between the two sides;

one side of the conveying mechanism (8) is provided with a first motor (9), the output end of the first motor (9) is provided with a driving gear (901), the driving gear extends into the conveying belt (803) between two gear shafts (802) and is meshed with the conveying belt (803), and the upper plane of the conveying belt (803) is driven to move along the radial direction of the pump pipe (4).

6. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 5, wherein: be equipped with second slide rail (10) on first motor (9) below horizontal pole (102), first motor (9) lower surface passes through second slider (11) and second slide rail (10) sliding connection, first motor (9) stiff end is connected with support body (1) through second elastic component (12), transport mechanism (8) opposite side is equipped with first cylinder (13), first cylinder (13) output shaft and the coaxial subtend setting of first motor (9) output shaft, drive first motor (9) slide along second slide rail (10), make driving gear (901) leave conveyer belt (803) internal surface scope.

7. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 1, wherein: the support hanger (3) top is equipped with second cylinder (14), second cylinder (14) output shaft is equipped with axle head screw thread (1401), support hanger (3) upper half pipe box (302) top is equipped with screw thread pipe box (3021), axle head screw thread (1401) and screw thread pipe box (3021) threaded connection, second cylinder (14) cylinder body top is connected with rotation axis (15) one end, rotation axis (15) middle part is equipped with worm wheel (16), rotation axis (15) other end and support body (1) top apron (103) rotate and are connected, rotation axis (15) one side is equipped with second motor (17), the opposite side is equipped with bearing frame (18), worm (19) and worm wheel (16) meshing, and one end and second motor (17) output shaft, the other end is connected with bearing frame (18) rotation, second cylinder (14) and second motor (17) drive axle head screw thread (1401) rotation down jointly and are connected with pipe box (302).

8. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 1, wherein: a rotary support (20) is arranged on a cross rod (102) on the other side of the frame body (1), a base (2001) is connected with the cross rod (102), a rotary frame (2002) is rotationally connected with the base (2001), the rotary frame (2002) is arc-shaped, and the outer surface of the pipe end of the pump pipe (4) is abutted against the rotary frame (2002).

9. The split heads for reducing the concrete conveying resistance of a ground pump according to claim 1, wherein: the lower part of four corners of the bottom layer frame (101) is connected with universal wheels (22) through second connecting plates (21), the outer sides of the universal wheels (22) are provided with hydraulic cylinders (23), the hydraulic cylinders (23) are connected with the second connecting plates (21) through connecting pipe sleeves (24), the output shaft ends of the hydraulic cylinders (23) are provided with round support pads (25), and the lower surfaces of the support pads (25) are provided with anti-slip coatings.

10. A method of using a split heads for reducing the resistance to delivery of ground pump concrete according to any one of claims 1 to 9, wherein: the method comprises the following steps:

s1, a second cylinder (14) is connected with a pipe sleeve (302) at the upper half part of a support and hanger (3) and is positioned at an initial position;

s2, the hydraulic cylinder (23) is positioned at an initial position, after the frame body (1) moves to a construction point, the hydraulic cylinder (23) is pressed down, and the universal wheel (22) leaves the ground;

S3, a first air cylinder (13) is positioned at an initial position, and a conveying mechanism (8) moves the pump pipe (4) to a fixed point of the support and hanger (3);

s4, the second air cylinder (14) is pressed down, and after the upper half pipe sleeve (302) and the lower half pipe sleeve (302) of the support and hanger (3) are connected and locked, the second air cylinder (14) is rotated and retracted to an initial position;

s5, the first cylinder (13) pushes the driving gear (901) to leave the range of the inner surface of the conveyor belt (803);

s6, starting pumping concrete.