CN208812295U - A kind of silt spray equipment for tunnel maintenance - Google Patents

A kind of silt spray equipment for tunnel maintenance Download PDF

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Publication number
CN208812295U
CN208812295U CN201820890999.5U CN201820890999U CN208812295U CN 208812295 U CN208812295 U CN 208812295U CN 201820890999 U CN201820890999 U CN 201820890999U CN 208812295 U CN208812295 U CN 208812295U
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CN
China
Prior art keywords
car body
mechanical arm
silt
agitator tank
spray equipment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201820890999.5U
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Chinese (zh)
Inventor
于洪涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Handan Ao Ao Machinery And Equipment Sales Co Ltd
Original Assignee
Handan Ao Ao Machinery And Equipment Sales Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Handan Ao Ao Machinery And Equipment Sales Co Ltd filed Critical Handan Ao Ao Machinery And Equipment Sales Co Ltd
Priority to CN201820890999.5U priority Critical patent/CN208812295U/en
Application granted granted Critical
Publication of CN208812295U publication Critical patent/CN208812295U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of silt spray equipments for tunnel maintenance, including car body, the car body left end is driver's cabin, the car body is equipped with headstock, swing mechanism, driving mechanism, water tank, squirts mechanism, agitator tank, accelerator addition case and feeding mechanism, first mechanical arm is fixed on the revolution table top, the first mechanical arm is fixed on vertically on revolution table top, the first mechanical arm top is hinged with second mechanical arm, first hydraulic cylinder is hinged between the second mechanical arm and first mechanical arm, the second mechanical arm top is fixed with spray gun.The utility model has the beneficial effects that of simple structure and strong practicability.

Description

A kind of silt spray equipment for tunnel maintenance
Technical field
The present invention relates to tunnel construction machinery apparatus field, especially a kind of silt spray equipment for tunnel maintenance.
Background technique
It is needed in the work of constructing tunnel and maintenance by silt concrete spray to tunnel cross-section, current spray coating operations are normal It is carried out with shotcrete vehicle, the working principle of shotcrete vehicle is that it is defeated that the good concrete mixture of premixing is passed through pipeline using compressed air It send to the nozzle of spraying machine, forms material beam after adding accelerator, be ejected at a high speed by spray plane, and condensation hardening rapidly, To form concrete supporting.Wet Shotcrete Technology has with its easy technique, economic cost in various construction fields Be widely applied.Spraying machine used at present is mostly minicomputer, matching component scattering device.This spraying machine cannot be well The quality of concrete is controlled, concrete is easy rebound and slump, and construction quality is poor, construction efficiency is low;Injector head by manual operation, Labor intensity of workers is big, injection when the dust that generates it is more, construction environment is severe, influences the health of construction personnel;It needs to drag Vehicle could shift, and mobility is poor, and the utilization rate of equipment is low.
Summary of the invention
The purpose of the present invention is to solve the above problems, devise a kind of silt spray equipment for tunnel maintenance.
Realize above-mentioned purpose the technical scheme is that, a kind of silt spray equipment for tunnel maintenance, including vehicle Body, the car body left end are driver's cabin, on the car body and are located on the right side of driver's cabin and are equipped with headstock, are equipped in the headstock Hydraulic station, air pressure pump and battery group on the car body and are located on the right side of power generation box and are equipped with swing mechanism, the turn-around machine Structure is by the pivoting support fixing rotary table on the car body, being inlaid on rotary table, returning of being fixedly connected with pivoting support Table with revolvable top collectively forms, and the slewing equipment side is equipped with driving mechanism, and the driving mechanism is by being fixed on revolution table top Driving box, be located at hydraulic motor in driving box, the shaft coupling being connect with hydraulic motor output end, one end and shaft coupling connection it is another It holds the worm speed reducer that connect with pivoting support to collectively form, is fixed with first mechanical arm on the revolution table top, described first Mechanical arm is fixed on vertically on revolution table top, and the first mechanical arm top is hinged with second mechanical arm, the second mechanical arm It is hinged with first hydraulic cylinder between first mechanical arm, the second mechanical arm top is fixed with spray gun, on the car body and is located at Water tank is equipped on the right side of slewing equipment, water tank upper end side is provided with water inlet one and water outlet, is equipped with and draws water in the water tank Pump on the car body and is located on the right side of water tank and squirts mechanism, it is described squirt mechanism by fix mixing tank on the car body, be located at it is mixed Mixing chamber in mould assembling, be opened in the first charging aperture of upper end in mixing chamber, be opened in mixing chamber in and it is adjacent with first charging aperture Second charging aperture, the spraying mouth for being opened in the air inlet of side in mixing chamber, being opened in mixing chamber bottom end side collectively form, the spray The jet pipe for being equipped at mouth and being tightly connected with spray gun is applied, the air inlet pipe being connected to air pressure pump is equipped at the air inlet, it is described On car body and position squirts and is equipped with agitator tank and accelerator addition case above mechanism, and the agitator tank and accelerator addition case are by cabinet Bracket is fixed on above mixing tank, and the agitator tank top is provided with feed opening, loading hopper is equipped at the feed opening, described to stir It mixes case lower end and is provided with silt discharge port, the discharge outlet is equipped with the first feed pipe being tightly connected with first charging aperture, described Accelerator addition case lower end is provided with accelerator discharge port, and the accelerator discharge outlet is equipped with to be tightly connected with second charging aperture Second feed pipe, agitator tank upper end side are provided with water inlet two, are equipped at the water inlet two and connect with suction pump water outlet The water inlet pipe of water outlet is connect and is inserted through, the water inlet pipe is equipped with first flow and counts device, is equipped with stirring in the agitator tank Mechanism, the car body right end be equipped with feeding mechanism, the feeding mechanism by be located at car body right end and the feed hopper hinged with car body, One end connect the second hydraulic cylinder that the other end is connect with feed hopper lower end with car body and third hydraulic cylinder collectively forms.
The headstock is equipped with controller.
The rabbling mechanism stirs the bearing of box cavity two sides by being inlaid in, is inserted through bearing and agitator tank is stretched out in one end Shaft, the rotating electric machine for being fixed on agitator tank and connecting with shaft extension end, the paddle being sleeved in shaft collectively form.
First flow control valve and the first check valve are equipped in first feed pipe.
Second feed pipe is equipped with second flow and counts device, second one-way valve and second flow control valve.
The air inlet pipe is equipped with pressure sensor, third check valve and safety valve.
The first liquid level sensor is equipped in the water tank.
The second liquid level sensor is equipped in the agitator tank.
Capacitor display screen, signal receiver, PLC system are equipped in the controller.
The controller and hydraulic station, air pressure pump, battery group, hydraulic motor, suction pump, rotating electric machine, first Flow control valve, second flow count device, second flow control valve, pressure sensor, the first liquid level sensor, the second liquid level and pass Sensor is electrically connected.
A kind of silt spray equipment for tunnel maintenance made using technical solution of the present invention, may be implemented 360 Degree sprayed automatically without dead angle, the present apparatus have injection uniformly, job area is big, labor intensity of workers is small, the rebound of concrete and The advantages that slump amount is few, construction quality is good, high-efficient, easy to operate.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of silt spray equipment for tunnel maintenance of the present invention;
Fig. 2 is a kind of top view of silt spray equipment for tunnel maintenance of the present invention;
Fig. 3 is a kind of structural schematic diagram of silt spray equipment work system for tunnel maintenance of the present invention;
Fig. 4 is the structural schematic diagram of controller of the present invention;
In figure, 1, car body;2, driver's cabin;3, headstock;4, hydraulic station;5, air pressure pump;6, battery group;7, it returns Turn pedestal;8, pivoting support;9, table top is turned round;10, driving box;11, hydraulic motor;12, shaft coupling;13, worm speed reducer; 14, first mechanical arm;15, second mechanical arm;16, first hydraulic cylinder;17, spray gun;18, water tank;19, water inlet one;20, go out The mouth of a river;21, suction pump;22, mixing tank;23, mixing chamber;24, first charging aperture;25, second charging aperture;26, air inlet;27, Spray mouth;28, jet pipe;29, air inlet pipe;30, agitator tank;31, accelerator adds case;32, antinose-dive leg;33, feed opening;34, Loading hopper;35, silt discharge port;36, the first feed pipe;37, accelerator discharge port;38, the second feed pipe;39, water inlet two; 40, water inlet pipe;41, feed hopper;42, second hydraulic cylinder;43, third hydraulic cylinder;44, controller;45, bearing;46, shaft;47, Rotating electric machine;48, paddle;49, first flow control valve;50, the first check valve;51, second flow counts device;52, second Check valve;53, second flow control valve;54, pressure sensor;55, third check valve;56, safety valve;57, the first liquid level passes Sensor;58, the second liquid level sensor;59, capacitor display screen;60, signal receiver;61, PLC system;62, first flowmeter Number device.
Specific embodiment
The present invention is specifically described with reference to the accompanying drawing, as shown in Figs 1-4, a kind of silt spray for tunnel maintenance Coating device, including car body 1,1 left end of car body are driver's cabin 2, on the car body 1 and are located on the right side of driver's cabin 2 and are equipped with power Case 3, is equipped with hydraulic station 4, air pressure pump 5 and battery group 6 in the headstock 3, and on the car body 1 and to be located at power generation box right Side is equipped with swing mechanism, and the swing mechanism is by the rotary table 7 being fixed on car body 1, the revolution being inlaid on rotary table 7 Bearing 8, the revolution table top 9 being fixedly connected with pivoting support 8 collectively form, and the slewing equipment side is equipped with driving mechanism, institute Driving mechanism is stated by being fixed on the driving box 10 turned round on table top 9, being located at hydraulic motor 11 and hydraulic motor in driving box 10 Shaft coupling 12, one end and the shaft coupling 12 of 11 output ends connection connect the worm speed reducer 13 that the other end is connect with pivoting support 8 It collectively forms, first mechanical arm 14 is fixed on the revolution table top 9, the first mechanical arm 14 is fixed on revolving platform vertically On face 9,14 top of first mechanical arm is hinged with second mechanical arm 15, the second mechanical arm 15 and first mechanical arm 14 Between be hinged with first hydraulic cylinder 16,15 top of second mechanical arm is fixed with spray gun 17, on the car body 1 and is located at turn around dress It sets right side and is equipped with water tank 18, the 18 upper end side of water tank is provided with water inlet 1 and water outlet 20, is equipped in the water tank 18 Suction pump 21 on the car body 1 and is located on the right side of water tank 18 and squirts mechanism, and described to squirt mechanism mixed on car body 1 by being fixed on Mould assembling 22, the first charging aperture 24 for being opened in upper end in mixing chamber 23, is opened in mixing chamber 23 at the mixing chamber 23 being located in mixing tank 22 Interior and adjacent with first charging aperture 24 second charging aperture 25, is opened in mixing chamber at the air inlet 26 for being opened in side in mixing chamber 23 The spraying mouth 27 of 23 bottom ends side collectively forms, and is equipped with the jet pipe 28 being tightly connected with spray gun 17 at the spraying mouth 27, described It is equipped with the air inlet pipe 29 that be connected to air pressure pump 5 at air inlet 26, on the car body 1 and position squirts to be equipped with above mechanism and stir Case 30 and accelerator add case 31, and the agitator tank 30 and accelerator addition case 31 are fixed in mixing tank 22 by antinose-dive leg 32 Side, 30 top of agitator tank is provided with feed opening 33, is equipped with loading hopper 34 at the feed opening 33, under the agitator tank 30 End is provided with silt discharge port 35, is equipped with the first feed pipe being tightly connected with first charging aperture 24 at the silt discharge port 35 36, accelerator addition 31 lower end of case is provided with accelerator discharge port 37, be equipped at the accelerator discharge port 37 with second into The second feed pipe 38 that material mouth 25 is tightly connected, the 30 upper end side of agitator tank is provided with water inlet 2 39, the water inlet two 39 are equipped with the water inlet pipe 40 that 21 water outlet of suction pump connects and is inserted through water outlet 20, and the water inlet pipe is equipped with first flowmeter Number device 62, the agitator tank 30 is interior to be equipped with rabbling mechanism, and 1 right end of car body is equipped with feeding mechanism, and the feeding mechanism is by setting In 1 right end of car body and the feed hopper 41 hinged with car body 1, one end and car body 1 connect what the other end was connect with 41 lower end of feed hopper Second hydraulic cylinder 42 and third hydraulic cylinder 43 collectively form;The headstock 3 is equipped with controller 44;The rabbling mechanism is by embedding Mounted in 30 inner cavity two sides of agitator tank bearing 45, be inserted through bearing 45 and one end and stretch out the shaft 46 of agitator tank 30, be fixed on and stir It mixes on case 30 and the rotating electric machine 47 connecting with 46 extension end of shaft, the paddle 48 that is sleeved in shaft 46 collectively forms;Institute It states in the first feed pipe 36 and is equipped with first flow control valve 49 and the first check valve 50;Second feed pipe 38 is equipped with second Flowmeter counter 51, second one-way valve 52 and second flow control valve 53;The air inlet pipe 29 is equipped with pressure sensor 54, the Three check valves 55 and safety valve 56;The first liquid level sensor 57 is equipped in the water tank 18;The is equipped in the agitator tank 30 Two liquid level sensors 58;Capacitor display screen 59, signal receiver 60, PLC system 61 are equipped in the controller 44;The control Device 44 and hydraulic station 4, air pressure pump 5, battery group 6, hydraulic motor 11, suction pump 21, rotating electric machine 47, first flow control Valve 49 processed, second flow count device 51, second flow control valve 53, pressure sensor 54, the first liquid level sensor 57, second Liquid level sensor 58 is electrically connected.
The characteristics of the present embodiment is, swing mechanism is by fixing rotary table on the car body, being inlaid on rotary table Pivoting support, the revolution table top that is fixedly connected with pivoting support collectively form, slewing equipment side is equipped with driving mechanism, driving Mechanism is by the driving box being fixed on revolution table top, the connection for being located at hydraulic motor in driving box, connecting with hydraulic motor output end The worm speed reducer that axis device, one end and the shaft coupling connection other end are connect with pivoting support collectively forms, and turns round fixed on table top There is first mechanical arm, first mechanical arm is fixed on vertically on revolution table top, and first mechanical arm top is hinged with second mechanical arm, the First hydraulic cylinder is hinged between two mechanical arms and first mechanical arm, second mechanical arm top is fixed with spray gun, squirts mechanism by solid Fixed mixing tank on the car body, is opened in the first charging aperture of upper end in mixing chamber, is opened in mixing the mixing chamber being located in mixing tank Intracavitary and adjacent with first charging aperture second charging aperture is opened in the air inlet of side in mixing chamber, is opened in mixing chamber bottom end one The spraying mouth of side collectively forms, and sprays and is equipped with the jet pipe that is tightly connected with spray gun at mouth, is equipped at air inlet and air pressure pump The air inlet pipe of connection, on car body and position, which squirts, is equipped with agitator tank and accelerator addition case above mechanism, agitator tank lower end is provided with mud Husky discharge port, silt discharge outlet are equipped with the first feed pipe being tightly connected with first charging aperture, and accelerator addition case lower end is opened There is accelerator discharge port, accelerator discharge outlet is equipped with the second feed pipe being tightly connected with second charging aperture, agitator tank upper end Side is provided with water inlet two, and water inlet two is equipped with the connection of suction pump water outlet and is inserted through the water inlet pipe of water outlet, in agitator tank Equipped with rabbling mechanism, car body right end is equipped with feeding mechanism, feeding mechanism by be located at car body right end and the feed hopper hinged with car body, One end connect the second hydraulic cylinder that the other end is connect with feed hopper lower end with car body and third hydraulic cylinder collectively forms.Utilize this hair A kind of silt spray equipment for tunnel maintenance of bright technical solution production, may be implemented 360 degree and sprays automatically without dead angle, The present apparatus is uniform with injection, job area is big, labor intensity of workers is small, the rebound of concrete and slump amount are few, construction quality The advantages that good, high-efficient, easy to operate.
In the present embodiment, by the way that raw material is added into feed hopper, second hydraulic cylinder and third are controlled by controller Hydraulic cylinder lifting, increases feed hopper one end to which raw material to be sent into loading hopper, raw material is passed through agitator tank, water by feed opening The water of case is pumped into agitator tank by suction pump, injects mixing chamber by the first feed pipe after the stirring of agitated device in agitator tank In, accelerator adds case and accelerator is added into mixing chamber from the second feed pipe, and air compressor is by compressed air by air supply tube Mixing chamber is promoted lactation, under the pressure of compressed air, concrete and accelerator are passed through jet pipe together, and are sprayed by spray gun, pass through control The injection direction of the adjustable spray gun of driving device processed, hydraulic motor drive speed reducer rotation, and speed reducer drives slewing equipment to turn Dynamic, to adjust injection direction, by the flexible of control first hydraulic cylinder, the first hydraulic cylinder drives second mechanical arm pitching, So as to adjust spray angle, hydraulic station and battery group can provide power for work, mix in quantity of water in water tank information and agitator tank Solidifying soil balance information can be transmitted to controller by the first liquid level sensor and the second liquid level sensor respectively, and be shown by display screen Real time data out.
Above-mentioned technical proposal only embodies the optimal technical scheme of technical solution of the present invention, those skilled in the art The principle of the present invention is embodied to some variations that some of them part may be made, belongs to the scope of protection of the present invention it It is interior.

Claims (10)

1. a kind of silt spray equipment for tunnel maintenance, including car body (1), which is characterized in that car body (1) left end is Driver's cabin (2) on the car body (1) and is located on the right side of driver's cabin (2) and is equipped with headstock (3), liquid is equipped in the headstock (3) Pressure station (4), air pressure pump (5) and battery group (6) on the car body (1) and are located on the right side of power generation box equipped with swing mechanism, The swing mechanism by the rotary table (7) being fixed on car body (1), the pivoting support (8) being inlaid on rotary table (7), The revolution table top (9) being fixedly connected with pivoting support (8) collectively forms, and slewing equipment side is equipped with driving mechanism, the driving Mechanism is by being fixed on the driving box (10) turned round on table top (9), being located at driving box (10) interior hydraulic motor (11) and hydraulic motor (11) turbine that the shaft coupling (12) of output end connection, one end and shaft coupling (12) the connection other end are connect with pivoting support (8) Speed reducer (13) collectively forms, and is fixed with first mechanical arm (14) on the revolution table top (9), and the first mechanical arm (14) is perpendicular It is directly fixed in revolution table top (9), first mechanical arm (14) top is hinged with second mechanical arm (15), and described second is mechanical It is hinged between arm (15) and first mechanical arm (14) first hydraulic cylinder (16), second mechanical arm (15) top is fixed with spray gun (17), it on the car body (1) and is located at turn around on the right side of device and is equipped with water tank (18), water tank (18) the upper end side is provided with into water One (19) of mouth and water outlet (20), the water tank (18) is interior to be equipped with suction pump (21), on the car body (1) and is located at water tank (18) Right side squirts mechanism, and the mechanism that squirts is by the mixing tank (22) being fixed on car body (1), the mixing being located in mixing tank (22) Chamber (23), the first charging aperture (24) for being opened in mixing chamber (23) interior upper end are opened in mixing chamber (23) and and first charging aperture (24) adjacent second charging aperture (25), be opened in mixing chamber (23) interior side air inlet (26), be opened in mixing chamber (23) bottom end The spraying mouth (27) of side collectively forms, and is equipped with the jet pipe (28) being tightly connected with spray gun (17), institute at spraying mouth (27) It states and is equipped with the air inlet pipe (29) that is connected to air pressure pump (5) at air inlet (26), on the car body (1) and position squirts in mechanism Side is equipped with agitator tank (30) and accelerator addition case (31), and the agitator tank (30) and accelerator addition case (31) are by antinose-dive leg (32) it is fixed on above mixing tank (22), agitator tank (30) top is provided with feed opening (33), is pacified at the feed opening (33) Equipped with loading hopper (34), agitator tank (30) lower end is provided with silt discharge port (35), is equipped at the silt discharge port (35) The first feed pipe (36) being tightly connected with first charging aperture (24), accelerator addition case (31) lower end are provided with accelerator and go out Material mouth (37) is equipped with the second feed pipe (38) being tightly connected with second charging aperture (25) at the accelerator discharge port (37), Agitator tank (30) the upper end side is provided with water inlet two (39), is equipped at the water inlet two (39) and is discharged with suction pump (21) End connection and the water inlet pipe (40) for being inserted through water outlet (20), the water inlet pipe is equipped with first flow and counts device (62), described Rabbling mechanism is equipped in agitator tank (30), car body (1) right end is equipped with feeding mechanism, and the feeding mechanism is by being located at car body (1) right end and the feed hopper (41) hinged with car body (1), one end and car body (1) connect the other end and feed hopper (41) lower end connects The second hydraulic cylinder (42) and third hydraulic cylinder (43) connect collectively forms.
2. a kind of silt spray equipment for tunnel maintenance according to claim 1, which is characterized in that the headstock (3) controller (44) are equipped with.
3. a kind of silt spray equipment for tunnel maintenance according to claim 1, which is characterized in that the blender Structure is by being inlaid in the bearing (45) of agitator tank (30) inner cavity two sides, being inserted through bearing (45) and turn of one end stretching agitator tank (30) Axis (46), is sleeved on shaft (46) at the rotating electric machine (47) for being fixed on agitator tank (30) and connecting with shaft (46) extension end On paddle (48) collectively form.
4. a kind of silt spray equipment for tunnel maintenance according to claim 1, which is characterized in that described first send First flow control valve (49) and the first check valve (50) are equipped in expects pipe (36).
5. a kind of silt spray equipment for tunnel maintenance according to claim 1, which is characterized in that described second send Expects pipe (38) is equipped with second flow and counts device (51), second one-way valve (52) and second flow control valve (53).
6. a kind of silt spray equipment for tunnel maintenance according to claim 1, which is characterized in that the air inlet pipe (29) pressure sensor (54), third check valve (55) and safety valve (56) are equipped with.
7. a kind of silt spray equipment for tunnel maintenance according to claim 1, which is characterized in that the water tank (18) the first liquid level sensor (57) are equipped in.
8. a kind of silt spray equipment for tunnel maintenance according to claim 1, which is characterized in that the agitator tank (30) the second liquid level sensor (58) are equipped in.
9. a kind of silt spray equipment for tunnel maintenance according to claim 2, which is characterized in that the controller (44) capacitor display screen (59), signal receiver (60), PLC system (61) are equipped in.
10. a kind of silt spray equipment for tunnel maintenance according to claim 9, which is characterized in that the control Device (44) and hydraulic station (4), air pressure pump (5), battery group (6), hydraulic motor (11), suction pump (21), rotating electric machine (47), first flow control valve (49), second flow count device (51), second flow control valve (53), pressure sensor (54), First liquid level sensor (57), the second liquid level sensor (58) are electrically connected.
CN201820890999.5U 2018-06-10 2018-06-10 A kind of silt spray equipment for tunnel maintenance Expired - Fee Related CN208812295U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820890999.5U CN208812295U (en) 2018-06-10 2018-06-10 A kind of silt spray equipment for tunnel maintenance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820890999.5U CN208812295U (en) 2018-06-10 2018-06-10 A kind of silt spray equipment for tunnel maintenance

Publications (1)

Publication Number Publication Date
CN208812295U true CN208812295U (en) 2019-05-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201820890999.5U Expired - Fee Related CN208812295U (en) 2018-06-10 2018-06-10 A kind of silt spray equipment for tunnel maintenance

Country Status (1)

Country Link
CN (1) CN208812295U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115302628A (en) * 2022-08-16 2022-11-08 深圳市市政工程总公司 Jet recycled concrete construction device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115302628A (en) * 2022-08-16 2022-11-08 深圳市市政工程总公司 Jet recycled concrete construction device
CN115302628B (en) * 2022-08-16 2023-08-18 深圳市市政工程总公司 Construction device for spraying recycled concrete

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20190503

Termination date: 20200610