Spray head adjusting device of gas hood method concrete spraying mechanical equipment

Abstract

The utility model discloses a spray head adjusting device of gas hood method concrete spraying mechanical equipment, and solves the problem that the springback amount is large in the concrete spraying process. The nozzle comprises a nozzle body, and the outer side of the nozzle body sprays to form a conical compressed air cover; a horizontally sliding adjusting sleeve is arranged on the spray head body, and the adjusting sleeve extrudes the compressed air cover to form a structure for compressing and controlling the taper change of the cover. The gas hood diffusion radius adjusting device is additionally arranged on the composite nozzle of gas hood method concrete spraying mechanical equipment, compared with a nozzle without the adjusting device, the diffusion radius of a pressure gas hood can be effectively reduced by 20-40 mm, the air pressure in the central area of the pressure gas hood is kept, the sealing effect of the gas hood is improved, and the compressed air loss of the gas hood is reduced. Under the same condition, the compressed air consumption of the air hood can be reduced by about 15-20%.

Description

Technical Field

[0001] The utility model relates to the technical field of wet concrete construction equipment, and in particular to a nozzle regulating device of air hood method shotcrete mechanical equipment. Background Art

[0002] Shotcrete is a kind of concrete with the same raw materials as ordinary concrete, but with special construction technology. It is a construction method that uses a sprayer to spray concrete mixture onto the surface of the structure to form a concrete layer. It is widely used in underground engineering, tunnel engineering, bridge engineering and other fields. It can complete large-scale concrete construction in a short time and improve construction efficiency; it can adapt to various complex terrains and structural forms; it is lighter, stronger and more durable than traditional concrete. Shotcrete technology has a history of nearly 100 years in the world. It started in Austria and was later adopted by Western developed countries such as Europe and the United States. China began to use it when the "New Austrian Tunneling Method" construction was promoted in railway tunnel construction in the late 1960s. It has been widely used in underground engineering with its simple process, timely support and low cost. There are two main spraying methods for shotcrete: dry spraying and wet spraying. In recent years, with the development of wet spraying technology and the emphasis on construction environment and occupational health of construction personnel, especially the emergence of dense flow wet spraying technology including concrete pumps, piston-type accelerator metering pumps and spray arms, the application field of wet spraying has been greatly broadened and it has occupied a dominant position, becoming the mainstream of spraying technology development in countries around the world. However, the most typical problem of shotcrete is the large rebound, which inevitably consumes more concrete materials and generates construction waste. In the budget quota of highway and hydropower construction, the loss rate of conventional structural concrete is generally 3%, while the loss rate of shotcrete exceeds 50%. One of the main factors for the high loss rate is the material waste caused by the rebound of concrete during construction, that is, the rebound rate of shotcrete. When the dry shotcrete process is used, the rebound rate is generally more than 30%, and when the wet shotcrete process is used, it is also more than 16%. In actual engineering applications, it generally exceeds 20%. In order to solve the problem of excessive rebound rate of shotcrete, the industry has been exploring through research on the raw materials, mix ratio, construction technology, etc. of concrete, such as developing high-performance, high-flowability, low-rebound shotcrete; adding new accelerators, viscosity enhancers, steel fibers, carbon fibers, etc.; using automated and intelligent construction equipment, construction technology such as the multi-shot method, and other comprehensive measures to reduce rebound and dust pollution, and improve the efficiency and quality of shotcrete construction. However, the current shotcrete technology is that concrete materials are directly sprayed out from the nozzle. Under the thrust of the airflow, they come into contact with the sprayed surface and adhere to form a spray layer. However, there is always a phenomenon that some concrete materials fall off after rebounding due to collision, resulting in material waste and generation of construction waste, which not only increases construction costs but also pollutes the environment. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a nozzle adjustment device for air hood method shotcrete mechanical equipment, which effectively solves the problem of large rebound during concrete spraying.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is: a nozzle adjustment device for air hood method shotcrete mechanical equipment, comprising a nozzle body, and a conical compressed air hood is sprayed on the outside of the nozzle body;

[0005] The nozzle body is provided with a horizontally sliding adjustment sleeve, which squeezes the compressed air cover to form a structure for changing the taper of the compression control cover.

[0006] Preferably, it also includes a telescopic rod, which is arranged outside the nozzle body, and the end of the telescopic rod is fixedly connected to the adjusting sleeve.

[0007] Preferably, a drive ring is threadedly connected to the nozzle body, and the drive ring is rotatably connected to the adjusting sleeve.

[0008] Preferably, a spiral cam groove is provided on the nozzle body, and a pin is slidably inserted into the cam groove;

[0009] It also includes a driving ring, in which a pin shaft is slidably disposed, and an adjusting sleeve is rotatably connected to the driving ring.

[0010] Preferably, a limit block is fixed to the outer end of the pin shaft, the limit block is placed in the driving ring, and the limit block is a structure that limits the separation of the pin shaft and the driving ring;

[0011] A guide rod is fixed to the outer end of the limit block, and the guide rod can slidably penetrate the drive ring;

[0012] The outer circle of the guide rod is sleeved with a spring, one end of the spring is fixedly connected to the driving ring, and the other end of the spring is fixedly connected to the limit block. The spring is a structure for driving the pin shaft to be inserted into the cam groove.

[0013] Preferably, a slide groove is provided on the inner side of the adjusting sleeve, a guide block is slidably provided in the slide groove, and the inner end of the guide block passes through the slide groove and is fixedly connected to the nozzle body.

[0014] The utility model adds an air hood diffusion radius adjustment device to the composite nozzle of the air hood method concrete spraying mechanical equipment. Compared with the nozzle without the adjustment device, the pressure air hood diffusion radius can be effectively reduced by 20 to 40 mm, the air pressure in the center of the pressure air hood can be maintained, the air hood sealing effect can be improved, and the air hood compressed air loss can be reduced. Under the same conditions, the air hood compressed air consumption can be reduced by about 15 to 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic structural diagram of another embodiment of the utility model for driving and adjusting the movement of the sleeve;

[0017] Figure 3 This is a structural schematic diagram of the third embodiment of the utility model for driving the adjusting sleeve to move (the adjusting sleeve is omitted);

[0018] Figure 4 for Figure 3 Schematic diagram of the structure after partial sectioning;

[0019] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the middle part A;

[0020] In the figure: 1. Nozzle body; 2. Compressed air cover; 3. Adjustment sleeve; 4. Telescopic rod; 5. Drive ring; 6. Cam groove; 7. Pin shaft; 8. Limit block; 9. Guide rod; 10. Spring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the utility model.

[0023] Please refer to Figure 1-5 , a nozzle regulating device for air hood method shotcrete mechanical equipment, comprising a nozzle body 1, a conical compressed air hood 2 is arranged on the right side of the nozzle body 1;

[0024] The nozzle body 1 is provided with a horizontally sliding adjustment sleeve 3, which squeezes the compressed air cover 2 to form a structure for compressing and controlling the taper of the cover.

[0025] It also includes a telescopic rod 4, which is arranged outside the nozzle body 1, and the end of the telescopic rod 4 is fixedly connected to the adjustment sleeve 3.

[0026] In the present device, a control device is also provided, and the control device controls the extension and retraction of the telescopic rod 4 .

[0027] The utility model adds a pressure air hood adjustment device to the composite nozzle of the concrete spraying machine to adjust the diffusion angle of the compressed air outside the air hood, reduce the diffusion radius of the pressure air hood, increase the pressure in the center area of ​​the pressure air hood, reduce the consumption of compressed air, and reduce the construction cost. The specific implementation plan is as follows:

[0028] ①Preparation work before spraying, including treatment of the sprayed surface, inspection of the spraying machine status, and input of concrete into the spraying machine receiving hopper;

[0029] ② The nozzle position is determined, and the operator manually or remotely controls the sprayer to make the nozzle perpendicular to the sprayed surface, with a deflection angle of no more than 10° and a distance of 50 to 100 cm from the sprayed surface;

[0030] ③ Open the compressed air pressure regulating valve and control the pressure at 0.3~0.8Mpa. The pressure should be adjusted according to the distance between the nozzle and the sprayed surface. When the nozzle is close, the pressure should be small, and when the nozzle is far, the pressure should be large. At this time, the nozzle in the sprayer and the sprayed surface form a pressure air hood;

[0031] ④ Open the control valve of the concrete nozzle, and control the pressure of the shotcrete at 0.3~0.6Mpa. Adjust it according to the distance between the nozzle and the sprayed surface. Take a small value when it is close and a large value when it is far.

[0032] ⑤ Adjust the air hood control unit and observe the rebound of the sprayed concrete. If rebounded concrete escapes from the closed air hood, adjust the air hood control unit to move the pressure air hood sleeve forward, reduce the diffusion radius of the pressure air hood, and increase the pressure in the center of the air hood, so that the rebounded concrete is enclosed in the air hood and sprayed onto the sprayed surface again. The maximum moving stroke of the air hood sleeve is 200mm.

[0033] ⑥ Adjust the compressed air pressure regulating valve. When the air hood sleeve moves to the maximum stroke by adjusting the air hood control unit, it still cannot block the rebound of concrete. It is necessary to adjust the compressed air pressure regulating valve to increase the pressure of the air hood to block the escape of the rebound concrete.

[0034] Note that the nozzle pressure air hood adjustment device should keep the sleeve position at the initial 0 position when not working or at the start of work. When it is adjusted to the maximum stroke of 200mm during work, there is still rebound concrete escaping, and then the air hood compression air is increased to increase the air hood sealing force. Finally, the distance between the sprayer nozzle and the sprayed surface is reduced to improve the concrete rebound rate control effect.

[0035] As another embodiment of driving the adjusting sleeve 3 to move, a driving ring 5 is threadedly connected to the nozzle body 1 , and the driving ring 5 is rotatably connected to the adjusting sleeve 3 .

[0036] The driving ring 5 is extended with a rod, so that the driving ring 5 can be driven to rotate conveniently. The rotation of the driving ring 5 can drive the adjusting sleeve 3 to slide horizontally.

[0037] In addition, the driving ring 5 and the nozzle body 1 are connected by threads, and the self-locking property of the threads is utilized to increase the stability of the adjusting sleeve 3 after sliding.

[0038] As another embodiment of driving the adjusting sleeve 3 to move, the nozzle body 1 is provided with a spiral cam groove 6, and a pin shaft 7 is slidably inserted into the cam groove 6;

[0039] It also includes a driving ring 5, in which a pin shaft 7 is slidably disposed, and the adjusting sleeve 3 is rotatably connected to the driving ring 5.

[0040] As for the spiral angle of the cam groove 6 here, when we designed it, it cooperated with the pin shaft 7 to meet the self-locking condition. When the pin shaft 7 is inserted into the cam groove 6, it is similar to a threaded fit, and the adjustment sleeve 3 slides through the rotation of the drive ring 5.

[0041] When the pin shaft 7 does not cooperate with the cam groove 6, the adjusting sleeve 3 can slide quickly to achieve the purpose of rapid adjustment.

[0042] The outer end of the pin shaft 7 is fixed with a limit block 8, which is placed in the driving ring 5. The limit block 8 is a structure that limits the separation of the pin shaft 7 from the driving ring 5.

[0043] A guide rod 9 is fixed to the outer end of the limit block 8, and the guide rod 9 can slidably penetrate the drive ring 5;

[0044] The guide rod 9 is sheathed with a spring 10 , one end of the spring 10 is fixedly connected to the drive ring 5 , and the other end of the spring 10 is fixedly connected to the limit block 8 . The spring 10 is a structure for driving the pin shaft 7 to be inserted into the cam groove 6 .

[0045] In this device, the outermost end of the guide rod 9 passes through the drive ring 5 and is fixed with a handle, which makes it convenient to drive the guide rod 9 to slide. Under the action of the spring 10, the pin shaft 7 is always inserted into the cam groove 6. In the absence of strong external force, the pin shaft 7 will not separate from the cam groove 6.

[0046] The inner side of the adjusting sleeve 3 is provided with a slide groove, and a guide block is slidably provided in the slide groove. The inner end of the guide block passes through the slide groove and is fixedly connected to the nozzle body 1.

[0047] The arrangement of the guide block and the slide groove ensures the horizontal sliding effect of the adjusting sleeve 3.

[0048] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the description of the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood by specific circumstances.

[0049] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A nozzle adjustment device for a hood-type concrete spraying machine, comprising a nozzle body (1), characterized in that: The outer side of the nozzle body (1) is sprayed to form a conical compressed air hood (2); The nozzle body (1) is provided with a horizontally sliding adjustment sleeve (3), and the adjustment sleeve (3) compresses the compressed air cover (2) to form a structure for compressing and controlling the taper of the cover.

2. The nozzle adjustment device for air hood method shotcrete spraying machinery and equipment according to claim 1 is characterized in that: It also comprises a telescopic rod (4), which is arranged outside the nozzle body (1), and an end of the telescopic rod (4) is fixedly connected to the adjustment sleeve (3).

3. The nozzle adjustment device for air hood method shotcrete spraying machinery and equipment according to claim 1 is characterized in that: The nozzle body (1) is provided with a drive ring (5) which is threadedly connected, and the drive ring (5) is rotatably connected to the adjustment sleeve (3).

4. The nozzle adjustment device for air hood method shotcrete spraying machinery and equipment according to claim 1 is characterized in that: The nozzle body (1) is provided with a spiral cam groove (6), and a pin shaft (7) is slidably inserted into the cam groove (6); It also includes a driving ring (5), a pin shaft (7) slidably disposed in the driving ring (5), and an adjusting sleeve (3) is rotatably connected to the driving ring (5).

5. The nozzle adjustment device for air hood method shotcrete spraying machinery and equipment according to claim 4 is characterized in that: A limit block (8) is fixed to the outer end of the pin shaft (7), the limit block (8) is disposed in the driving ring (5), and the limit block (8) is a structure for limiting the separation of the pin shaft (7) and the driving ring (5); A guide rod (9) is fixed to the outer end of the limit block (8), and the guide rod (9) can slidably penetrate the drive ring (5); The guide rod (9) is sleeved with a spring (10) on its outer circumference. One end of the spring (10) is fixedly connected to the drive ring (5), and the other end of the spring (10) is fixedly connected to the limit block (8). The spring (10) is a structure for driving the pin shaft (7) to be inserted into the cam groove (6).

6. A nozzle adjustment device for air hood spraying concrete machinery and equipment according to any one of claims 2 to 5, characterized in that: The inner side of the adjusting sleeve (3) is provided with a slide groove, and a guide block is slidably provided in the slide groove, and the inner end of the guide block passes through the slide groove and is fixedly connected to the nozzle body (1).

Images