Sand blasting nozzle with replaceable nozzle head and capable of supporting multi-granularity sand shots

Abstract

The utility model relates to a multi-granularity sand shot supporting sand blasting nozzle with a replaceable nozzle head, and relates to the technical field of sand blasting nozzles. The nozzle comprises a nozzle tail, a plurality of sand shot inlets are formed in the side wall of the nozzle tail, each sand shot inlet is provided with a sand shot regulation and control valve for controlling whether the sand shot inlet is communicated or not, each sand shot regulation and control valve is communicated with a sand inlet pipeline, the tail end of the nozzle tail is communicated with an air inlet pipe, a nozzle head clamping jaw is fixed to the nozzle tail, and the nozzle head clamping jaw is fixed to the nozzle tail. The nozzle head clamping jaw is fixedly clamped and butted to the nozzle head of the nozzle tail, the nozzle head and the nozzle tail can be separated, a clamping groove is formed in the outer wall of the nozzle head, a clamping block corresponding to the clamping groove is arranged on the nozzle head clamping jaw, part of a channel of the nozzle head is a convergent pipeline, and the convergent angle of the convergent pipeline is of various specifications. And when sand shots with different particle sizes are replaced, the corresponding nozzle heads are replaced to adapt to the particle sizes of the sand shots, so that the sand blasting efficiency is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sandblasting nozzle design, in particular to a sandblasting nozzle with a replaceable nozzle head supporting sand pellets with multiple grain sizes. Background Art

[0002] Sandblasting uses compressed air as a power source to form a high-speed jet beam to spray sand shots (corundum, quartz sand, rounded steel sand, etc.) at high speed onto the surface of the workpiece to be processed. Due to the impact and cutting effect of the sand shots on the workpiece surface, it can usually be used to clean the oxide scale, residual salt, and residual oil on the workpiece surface; clean the residues and burrs of machined parts; clean the flash of plastic molded parts; remove rust from various pipes and containers; clean scratches on decorative surfaces or pre-treat the surface of workpieces; polish the surface of wooden products and clean and preserve other artworks, etc. During the sandblasting process, it is often necessary to change the particle size of the sand shots according to the processing requirements, and the efficiency of the sandblasting nozzle is described by the overall momentum of the ejected sand shots, which is related to the sand shot diameter and the structure of the sandblasting nozzle. Experiments show that the critical convergence angle of the convergence pipe of the sandblasting nozzle will change with the particle size of the sand shot. For sand shots of the same particle size, when sandblasting under the same conditions, if the actual convergence angle of the convergence pipe of the sandblasting nozzle is less than the critical convergence angle, increasing the actual convergence angle will increase the overall momentum of the sand shot ejected. If the actual convergence angle of the convergence pipe of the sandblasting nozzle exceeds the critical convergence angle, increasing the actual convergence angle will rapidly reduce the overall momentum of the sand shot ejected. The critical convergence angle is related to the particle size of the sand shot used. As the particle size of the sand shot increases, the critical convergence angle moves nonlinearly toward a larger angle. Therefore, a sandblasting nozzle with a replaceable nozzle head that supports multi-particle size sand shots is needed. When changing the particle size of the sand shot, it supports replacing the nozzle head with a convergence pipe that is closer to the critical convergence angle of the corresponding sand shot particle size to ensure the sandblasting efficiency after replacing the sand shot. Utility Model Content

[0003] In order to solve the above technical problem or at least partially solve the above technical problem, the utility model provides a sandblasting nozzle with a replaceable nozzle head supporting sand shots of multiple particle sizes.

[0004] The utility model provides a sandblasting nozzle with a replaceable nozzle head supporting sand shots of multiple particle sizes, comprising:

[0005] Nozzle tail, the side wall of the nozzle tail is provided with multiple sand shot inlets, each of the sand shot inlets is provided with a sand shot regulating valve for controlling whether the sand shot inlet is conductive, each of the sand shot regulating valves is respectively connected to the sand inlet pipeline, the tail end of the nozzle tail is connected to the air intake pipe, the nozzle tail fixes the nozzle head clamp, the nozzle head clamp is clamped to the nozzle head connected to the nozzle tail, the nozzle head and the nozzle tail are detachable, the outer wall of the nozzle head is provided with a slot, the nozzle head clamp is provided with a block corresponding to the slot, part of the channel of the nozzle head is a convergent pipe, and the convergence angle of the convergent pipe is set in a variety of specifications.

[0006] Furthermore, the nozzle head clamping claw comprises: a clamping claw sliding disk fixed on the nozzle tail, the clamping claw sliding disk is coaxially connected to a driving disk, six circumferentially arranged arc guide grooves are provided on the driving disk, and the driving disk is connected to a driving mechanism for controlling the driving disk to rotate relative to the clamping claw sliding disk;

[0007] Six T-shaped grooves with equal angles are radially arranged on the claw sliding plate, the claw is slidably arranged in the T-shaped groove, and a limiting pin is arranged at the end of the claw. The limiting pin on each claw is inscribed in the corresponding arc-shaped guide groove, and the clamping block is fixed on each claw.

[0008] Furthermore, the driving mechanism includes: an arc-shaped cylinder shell fixed to the claw sliding disk, the arc-shaped cylinder shell and the side wall of the driving disk form a sealed cylinder, the side wall of the driving disk fixes an arc-shaped piston, the arc-shaped piston is slidably arranged in the sealed cylinder, the two ends of the arc-shaped cylinder shell are respectively connected to the air pipe interface, the air pipe interface is connected to the second two-position three-way reversing valve via the air pipe, the second two-position three-way reversing valve is connected to the air supply mechanism, and the second two-position three-way reversing valve is electrically connected to the controller via the valve control circuit.

[0009] Furthermore, a sealing ring is arranged on the nozzle head.

[0010] Furthermore, the sand shot regulating valve comprises: an annular sand shot regulating valve body arranged outside the nozzle tail, the annular sand shot regulating valve body is provided with a corresponding sand shot inlet corresponding to each sand shot inlet, the sand shot inlet is connected to the sand inlet pipeline, the annular sand shot regulating valve body is provided with a corresponding arc-shaped pneumatic chamber corresponding to each sand shot inlet, pneumatic pipelines are respectively arranged at both ends of the arc-shaped pneumatic chamber, two pneumatic pipelines of each arc-shaped pneumatic chamber are connected to the corresponding first-two-position three-way reversing valve, each of the first-two-position three-way reversing valves is connected to the air supply mechanism, the first-two-position three-way reversing valve is connected to the air supply mechanism, and the first-two-position three-way reversing valve is connected to the air supply mechanism. The three-way reversing valve is electrically connected to the controller via a valve control circuit; an arc-shaped plate-shaped piston valve core is slidably arranged in the arc-shaped pneumatic chamber, the inner side of the arc-shaped plate-shaped piston valve core is in contact with the outer wall of the nozzle tail, the arc-shaped plate-shaped piston valve core is in contact with the arc-shaped pneumatic chamber wall, a through hole is arranged on the arc-shaped plate-shaped piston valve core, when the arc-shaped plate-shaped piston valve core moves to one end of the arc-shaped pneumatic chamber, the through hole conducts the sand shot inlet, and when the arc-shaped plate-shaped piston valve core moves to the other end of the arc-shaped pneumatic chamber, the arc-shaped plate-shaped piston valve core closes the sand shot inlet.

[0011] Furthermore, the air supply mechanism includes an air compressor, which is connected to an air tank via a one-way valve. The air tank provides a power source for the sand and shot regulating valve, the nozzle head clamp and sandblasting via the one-way valve. The air tank is provided with an air pressure sensor, which is electrically connected to a controller, and the controller is electrically connected to the air compressor.

[0012] Furthermore, the nozzle heads of various specifications are arranged on a nozzle head seat, and the nozzle head seat is provided with a nozzle head placement groove for accommodating the nozzle heads of various specifications.

[0013] The above technical solution provided by the embodiment of the utility model has the following advantages compared with the prior art:

[0014] The sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots provided by the present application is configured with a detachable and dockable nozzle tail and nozzle head, the nozzle tail is coupled with multiple sand inlet pipelines, and part of the channels of the nozzle head are convergent pipelines, and the convergence angle of the convergent pipeline is set in various specifications. When replacing sand shots of different particle sizes, the corresponding nozzle head is replaced. When the actual convergence angle of the nozzle head corresponds to the critical convergence angle corresponding to the particle size of the replaced sand shots, under the same conditions, the overall momentum of the ejected sand shots is the highest, thereby ensuring the sandblasting efficiency. In addition, the present application decouples the nozzle tail and the nozzle head, and there is no need to disassemble the sand inlet pipeline during the replacement of the nozzle head, which is simple to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 A schematic diagram of a sandblasting nozzle with a replaceable nozzle head supporting sand shots of multiple particle sizes provided by an embodiment of the utility model;

[0018] Figure 2 A cross-sectional view of a nozzle head, a nozzle tail and a sand shot regulating valve provided in an embodiment of the utility model;

[0019] Figure 3 A cross-sectional view of a sand shot regulating valve provided in an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the state of the first or second two-position three-way reversing valve provided in an embodiment of the utility model;

[0021] Figure 5 A schematic diagram of one side of the nozzle head clamping claw provided in an embodiment of the utility model;

[0022] Figure 6 A schematic diagram of the other side of the nozzle head clamping claw provided in an embodiment of the utility model;

[0023] Figure 7 A schematic diagram of a driving mechanism provided in an embodiment of the utility model.

[0024] The symbols and their meanings in the figure are as follows:

[0025] 1. Nozzle tail, 11. Sand shot inlet;

[0026] 2. sand shot regulating valve, 21. annular sand shot regulating valve body, 22. sand shot inlet, 23. arc-shaped pneumatic chamber, 24. arc-shaped plate-shaped piston valve core, 25. through hole;

[0027] 3. Sand inlet pipeline;

[0028] 4. Intake pipe;

[0029] 5. Nozzle head clamping claw, 51. Clamping claw sliding plate, 52. Clamping claw, 53. Clamping block, 54. Limiting pin shaft, 55. Driving plate, 56. Arc guide groove, 57. T-shaped slide groove;

[0030] 6. Nozzle head, 61. Card slot;

[0031] 7. driving mechanism, 71. arc-shaped cylinder housing, 72. arc-shaped piston. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that, in this article, the terms "include", "comprises" or any other variations 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 absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0034] During the sandblasting process, it is often necessary to change the particle size of the sand shot according to the processing requirements. The efficiency of the sandblasting nozzle is described by the overall momentum of the ejected sand shot, which is related to the diameter of the sand shot and the structure of the sandblasting nozzle. Experiments show that the critical convergence angle of the convergence pipe of the sandblasting nozzle will change with the particle size of the sand shot. For sand shots of the same particle size, when sandblasting under the same conditions, if the actual convergence angle of the convergence pipe of the sandblasting nozzle is less than the critical convergence angle, increasing the actual convergence angle will increase the overall momentum of the ejected sand shot. If the actual convergence angle of the convergence pipe of the sandblasting nozzle exceeds the critical convergence angle, increasing the actual convergence angle will rapidly reduce the overall momentum of the ejected sand shot. The critical convergence angle is related to the particle size of the sand shot used. As the particle size of the sand shot increases, the critical convergence angle moves nonlinearly toward the large angle direction.

[0035] To ensure the blasting efficiency after changing the shot size, refer to Figure 1 As shown, the embodiment of the utility model provides a sandblasting nozzle with a replaceable nozzle head that supports sand shots of multiple particle sizes, including: a detachable and dockable nozzle tail 1 and a nozzle head 6, the nozzle tail 1 is coupled with multiple sand inlet pipelines, and part of the channel of the nozzle head 6 is a convergent pipeline, and the convergence angle of the convergent pipeline is set in various specifications. When replacing sand shots of different particle sizes, the corresponding nozzle head is replaced to adapt to the sand shot particle size to ensure the sandblasting efficiency. In addition, the present application decouples the nozzle tail 1 and the nozzle head 6, and there is no need to disassemble the sand inlet pipeline during the replacement of the nozzle head, which is simple to implement.

[0036] In the specific implementation process, Figure 1 , Figure 2 and Figure 3As shown, the side wall of the nozzle tail 1 is provided with a plurality of sand pill inlets 11, and each of the sand pill inlets 11 is provided with a sand pill regulating valve 2 for controlling whether the sand pill inlet is conductive, and each of the sand pill regulating valves 2 is respectively connected to a sand inlet pipeline 3, and the tail end of the nozzle tail 1 is connected to an air intake pipe 4, and the sand pill regulating valve 2 comprises: an annular sand pill regulating valve body 21 arranged outside the nozzle tail 1, and the annular sand pill regulating valve body 21 is provided with a corresponding sand pill inlet 22 corresponding to each sand pill inlet 11, and the sand pill inlet 22 is connected to the sand inlet pipeline 3, and the annular sand pill regulating valve body 21 is provided with a corresponding arc-shaped air intake pipe 4 corresponding to each sand pill inlet 11 A pneumatic chamber 23 is provided with pneumatic pipelines at both ends of the arc-shaped pneumatic chamber 23, and the two pneumatic pipelines of each of the arc-shaped pneumatic chambers 23 are connected to the corresponding first-two-position three-way reversing valves, and each of the first-two-position three-way reversing valves is connected to the air supply mechanism, and the first-two-position three-way reversing valve is electrically connected to the controller via the valve control circuit; an arc-shaped plate-shaped piston valve core 24 is slidably arranged in the arc-shaped pneumatic chamber 23, and the inner side of the arc-shaped plate-shaped piston valve core 24 fits the outer wall of the nozzle tail 1, and the arc-shaped plate-shaped piston valve core 24 fits the wall of the arc-shaped pneumatic chamber 23, and a through hole 25 is arranged on the arc-shaped plate-shaped piston valve core 24.

[0037] When the arc plate-shaped piston valve core 24 moves to one end of the arc-shaped pneumatic chamber 23, the through hole 25 connects the sand pellet inlet 11, and when the arc plate-shaped piston valve core 24 moves to the other end of the arc-shaped pneumatic chamber 23, the arc plate-shaped piston valve core 24 closes the sand pellet inlet 11. Figure 3 and Figure 4 As shown, Figure 4 The two working states of the first and second position three-way reversing valve are given. When working, the gas supply mechanism provides pneumatic gas. Figure 4 In the upper state, the gas of the gas supply mechanism is supplied to the arcuate pneumatic chamber 23 below the arcuate plate-shaped piston valve core 24 through the pneumatic pipeline, and the pneumatic gas in the arcuate pneumatic chamber 23 above the arcuate plate-shaped piston valve core 24 is discharged through another pneumatic pipeline, and the arcuate plate-shaped piston valve core 24 moves upward, so that the sand shot inlet 11 is open. Figure 4 In the lower state, the pneumatic gas of the air supply mechanism is provided to the arc-shaped pneumatic chamber 23 on the upper side of the arc-shaped plate-shaped piston valve core 24 through the pneumatic pipeline, and the pneumatic gas in the arc-shaped pneumatic chamber 23 on the lower side of the arc-shaped plate-shaped piston valve core 24 is discharged through another pneumatic pipeline, and the arc-shaped plate-shaped piston valve core 24 moves downward, so that the sand shot inlet 11 is closed.

[0038] The nozzle tail 1 fixes the nozzle head claw 5, and the nozzle head claw 5 clamps the nozzle head 6 connected to the nozzle tail 1. The nozzle head 6 is separable from the nozzle tail 1. The outer wall of the nozzle head 6 is provided with a slot 61, and a block 53 corresponding to the slot is provided on the nozzle head claw 5.

[0039] In the specific implementation process, refer to Figure 1 , Figure 5 and Figure 6 As shown, the nozzle head clamping claw 5 includes: a clamping claw sliding disk 51 fixed on the nozzle tail 1, a driving disk 55 coaxially connected to the clamping claw sliding disk 51, six circumferentially arranged arc guide grooves 56 are arranged on the driving disk 55, and the driving disk 55 is connected to a driving mechanism 7 for controlling the rotation of the driving disk 55 relative to the clamping claw sliding disk 51; six T-shaped slide grooves 57 with equal angles are arranged radially on the clamping claw sliding disk 51, a clamping claw 52 is slidably arranged in the T-shaped slide groove 57, a limiting pin 54 is arranged at the end of the clamping claw 52, ​​the limiting pin 54 on each of the clamping claws 52 is inscribed in the corresponding arc guide groove 56, and the clamping block 53 is fixed on each of the clamping claws 52.

[0040] like Figure 7 As shown, the driving mechanism 7 comprises: an arc cylinder shell 71 fixed to the claw sliding disk 51, the arc cylinder shell 71 and the side wall of the driving disk 55 form a sealed cylinder, the side wall of the driving disk 55 fixes an arc piston 72, the arc piston 72 is slidably arranged in the sealed cylinder, the two ends of the arc cylinder shell 71 are respectively connected to the air pipe interface, the air pipe interface is connected to the second two-position three-way reversing valve through the air pipe, the second two-position three-way reversing valve is connected to the air supply mechanism, and the second two-position three-way reversing valve is electrically connected to the controller through the valve control circuit. When the arc piston 72 slides, it drives the driving disk 55 to rotate, and the arc guide groove 56 on the driving disk 55 drives the limit pin 54 to move, so that the claw 52 slides along the T-shaped slide groove 57, thereby clamping or releasing the nozzle head 6.

[0041] In the specific implementation process, in order to ensure the sealing between the nozzle head 6 and the nozzle tail 1, a sealing ring is provided on the nozzle head 6.

[0042] The air supply mechanism includes an air compressor, which is connected to an air tank via a one-way valve. The air tank provides a power source for the sand and shot regulating valve 2, the nozzle head clamping claw 5 and sandblasting via the one-way valve. The air tank is provided with an air pressure sensor, which is electrically connected to a controller, and the controller is electrically connected to the air compressor.

[0043] During the specific implementation, in order to facilitate the replacement of the nozzle heads 6 , the nozzle heads 6 of various specifications are arranged on a nozzle head seat, and the nozzle head seat is provided with nozzle head placement grooves for accommodating the nozzle heads 6 of various specifications.

[0044] In the embodiments provided by the present utility model, it should be understood that the disclosed structure can be implemented in other ways. For example, the structural embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, structures or units, which can be electrical, mechanical or other forms.

[0045] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0046] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0047] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots, characterized in that: include: A nozzle tail (1), wherein a plurality of sand pill inlets (11) are arranged on a side wall of the nozzle tail (1), and each of the sand pill inlets (11) is provided with a sand pill regulating valve (2) for controlling whether the sand pill inlet is open, and each of the sand pill regulating valves (2) is respectively connected to a sand inlet pipeline (3). The tail end of the nozzle tail (1) is connected to an air intake pipe (4). The nozzle tail (1) fixes a nozzle head clamp (5), and the nozzle head clamp (5) is clamped and connected to a nozzle head (6) of the nozzle tail (1). The nozzle head (6) and the nozzle tail (1) are separable, and a clamping groove (61) is arranged on an outer wall of the nozzle head (6), and a clamping block (53) corresponding to the clamping groove is arranged on the nozzle head clamp (5). Part of the channel of the nozzle head (6) is a convergent pipe, and the convergence angle of the convergent pipe is set in a variety of specifications.

2. The sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots according to claim 1, characterized in that: The nozzle head clamping claw (5) comprises: a clamping claw sliding disk (51) fixed on the nozzle tail (1), a driving disk (55) coaxially rotatably connected to the clamping claw sliding disk (51), six circumferentially arranged arc-shaped guide grooves (56) being provided on the driving disk (55), and the driving disk (55) being connected to a driving mechanism (7) for controlling the driving disk (55) to rotate relative to the clamping claw sliding disk (51); Six T-shaped grooves (57) with equal angles of spacing are radially arranged on the claw sliding plate (51); a claw (52) is slidably arranged in the T-shaped groove (57); a limit pin (54) is arranged at the end of the claw (52); the limit pin (54) on each of the claws (52) is inscribed in a corresponding arc-shaped guide groove (56); and the clamping block (53) is fixed on each of the claws (52).

3. The sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots according to claim 2, characterized in that: The driving mechanism (7) comprises: an arc-shaped cylinder shell (71) fixed to the claw sliding disk (51), the arc-shaped cylinder shell (71) and the side wall of the driving disk (55) forming a sealed cylinder, the side wall of the driving disk (55) fixing an arc-shaped piston (72), the arc-shaped piston slidingly arranged in the sealed cylinder, the two ends of the arc-shaped cylinder shell (71) are respectively connected to the air pipe interface, the air pipe interface is connected to the second two-position three-way reversing valve through the air pipe, the second two-position three-way reversing valve is connected to the air supply mechanism, and the second two-position three-way reversing valve is electrically connected to the controller through the valve control circuit.

4. The sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots according to claim 1, characterized in that: A sealing ring is provided on the nozzle head (6).

5. The sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots according to claim 1, characterized in that: The sand shot regulating valve (2) comprises: an annular sand shot regulating valve body (21) arranged outside the nozzle tail (1); the annular sand shot regulating valve body (21) is provided with a corresponding sand shot inlet (22) corresponding to each sand shot inlet (11); the sand shot inlet (22) is connected to a sand inlet pipeline (3); the annular sand shot regulating valve body (21) is provided with a corresponding arc-shaped pneumatic chamber (23) corresponding to each sand shot inlet (11); pneumatic pipelines are respectively arranged at both ends of the arc-shaped pneumatic chamber (23); the two pneumatic pipelines of each arc-shaped pneumatic chamber (23) are connected to a corresponding first two-position three-way reversing valve; each of the first two-position three-way reversing valves is connected to an air supply mechanism; the first two-position three-way reversing valve is connected to an air supply mechanism via a corresponding arc-shaped pneumatic chamber (23); The valve control circuit is electrically connected to the controller; an arc-shaped plate-shaped piston valve core (24) is slidably arranged in the arc-shaped pneumatic chamber (23); the inner side of the arc-shaped plate-shaped piston valve core (24) fits the outer wall of the nozzle tail (1); the arc-shaped plate-shaped piston valve core (24) fits the wall of the arc-shaped pneumatic chamber (23); a through hole is arranged on the arc-shaped plate-shaped piston valve core (24); when the arc-shaped plate-shaped piston valve core (24) moves to one end of the arc-shaped pneumatic chamber (23), the through hole conducts the sand shot inlet (11); when the arc-shaped plate-shaped piston valve core (24) moves to the other end of the arc-shaped pneumatic chamber (23), the arc-shaped plate-shaped piston valve core (24) closes the sand shot inlet (11).

6. The sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots according to claim 3 or 5, characterized in that: The air supply mechanism comprises an air compressor, the air compressor is connected to an air tank via a one-way valve, the air tank provides a power source for the sand and shot regulating valve (2), the nozzle head clamping claw (5) and sandblasting via the one-way valve, the air tank is provided with an air pressure sensor, the air pressure sensor is electrically connected to a controller, and the controller is electrically connected to the air compressor.

7. The sandblasting nozzle with a replaceable nozzle head supporting multi-size sand shots according to claim 1, characterized in that: The nozzle heads (6) of various specifications are arranged on a nozzle head seat, and the nozzle head seat is provided with a nozzle head placement groove for accommodating the nozzle heads (6) of various specifications.

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