An experimental apparatus for measuring the starting pressure gradient of pulverized coal.

Abstract

This utility model discloses an experimental device for measuring the starting pressure gradient of pulverized coal, relating to the technical field of pulverized coal measuring devices. It includes a storage tank, a feed pipe, an air inlet pipe, a connecting box, a support frame, and an air compressor. The output end of the air compressor is fixedly connected to the connecting box via an air delivery pipe. The connecting box is equipped with a locking mechanism for locking and maintaining the detected data. Through this locking mechanism, this utility model can automatically detect and lock the steadily rising pressure value in the storage tank and the inner cavity of the air inlet pipe during the pressurization of pulverized coal, effectively preventing the detected pressure value from automatically resetting during depressurization. This facilitates maintaining and recording the pressure value under the corresponding state, thereby ensuring the stability and traceability of the pressure data. By conveniently unlocking, the starting pressure gradient of pulverized coal can be remeasured based on the new pressure value, further improving the accuracy and reliability of the measurement.

Description

Technical Field

[0001] This utility model relates to the technical field of pulverized coal measuring devices, specifically an experimental device for measuring the starting pressure gradient of pulverized coal. Background Technology

[0002] The pulverized coal starting pressure gradient is the minimum pressure gradient threshold required to start static pulverized coal from flowing in scenarios such as pipeline transportation (e.g., pneumatic conveying pipelines). Essentially, it is a critical threshold. Only when the system pressure gradient reaches or exceeds this value will the pulverized coal change from static to flowing (below this value, it will remain deposited). Its core function is to overcome the cohesive force between pulverized coal particles, the friction between particles and the pipe wall, and the resistance generated by the gravity of the particles themselves.

[0003] Existing experimental devices for measuring the starting pressure gradient of pulverized coal use an air compressor driven by positive pressure. However, these devices typically use pressure gauges to monitor the internal pressure, which causes rapid pressure release during monitoring. This results in the pressure gauge readings returning to their original values, making it impossible to lock and maintain the pressure peak at the moment of pulverized coal startup (before pressure release). This directly affects the accuracy and reliability of the starting pressure gradient calculation. Therefore, this paper proposes an experimental device for measuring the starting pressure gradient of pulverized coal that eliminates the shortcomings of existing devices. Utility Model Content

[0004] The purpose of this invention is to provide an experimental device for measuring the starting pressure gradient of pulverized coal, so as to solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An experimental device for measuring the starting pressure gradient of pulverized coal includes a storage tank, a feed pipe installed at the top of the storage tank, an air inlet pipe fixedly connected to the outer wall of the storage tank, a connecting box fixedly connected to the bottom end of the air inlet pipe, a support frame fixedly connected to the bottom end of the connecting box, an air compressor installed inside the support frame, the output end of the air compressor being fixedly connected to the connecting box via an air delivery pipe, and a locking mechanism for locking and maintaining the detected data provided on the connecting box. The locking mechanism includes: A support cylinder is fixedly connected to one end of a connecting box. Two limiting guide plates are symmetrically fixedly connected to the inner wall of the support cylinder. A movable slide cylinder is slidably connected inside the support cylinder. The movable slide cylinder is slidably sleeved on the outer wall of the two limiting guide plates. A connecting slide cylinder is fixedly connected to the end of the movable slide cylinder away from the connecting box. The connecting slide cylinder extends to the outside of one end of the support cylinder and is slidably connected to the support cylinder. A numerical plate is fixedly connected to the outer wall of the connecting slide cylinder.

[0006] Based on the above technical solutions, this utility model also provides the following optional technical solutions: In one alternative embodiment, the locking mechanism further includes: A locking assembly is mounted on the movable slide tube; The engagement component includes: Two limiting slide plates are symmetrically slidably connected inside the movable slide cylinder. Two positioning blocks are symmetrically slidably connected inside the movable slide cylinder. The two limiting slide plates are located between the two positioning blocks. The two limiting slide plates are fixedly connected to the two positioning blocks respectively. The outer wall of the end of the two positioning blocks away from the two limiting slide plates is inclined. The two positioning blocks respectively penetrate the movable slide cylinder to the interior of the two limiting guide plates. The movable slide is provided with a limiting component for limiting the sliding of the limiting slide plate; The movable slide is equipped with a rotating component for driving the limiting slide plate to move; The connecting slide is provided with a first reset component for pushing the movable slide to reset.

[0007] In one alternative embodiment, the limiting component includes: Two fixed rods are symmetrically fixedly connected inside the movable slide cylinder, and the two limiting slide plates are slidably sleeved on the outer walls of the two fixed rods. The positioning block is located between the two fixed rods. A second reset component is provided on the fixed rod.

[0008] In one alternative: the second reset assembly includes two second springs symmetrically sleeved on the outer wall of the fixed rod, one end of each of the two second springs contacting the outer wall of the two limiting slides respectively, and the other end of each of the two second springs contacting the inner wall of the movable slide.

[0009] In one alternative embodiment: the rotating assembly includes: A transmission disc is rotatably connected inside the movable slide. Two connecting plates are symmetrically arranged at one end of the transmission disc. The two connecting plates are located between two limiting slide plates. The two connecting plates are fixedly connected to the two limiting slide plates respectively. A movable slider is fixedly connected to the end of each connecting plate near the transmission disc. A guide groove for the movable slider to slide is opened at the position where the transmission disc and the movable slider are connected. The transmission disk is equipped with a transmission component.

[0010] In one alternative embodiment, the transmission assembly includes: A connecting rod is fixedly connected to the end of the transmission disc away from the connecting pull plate. The connecting rod passes through the movable slide cylinder to the outside of one end of the connecting slide cylinder. The connecting rod is rotatably connected to the movable slide cylinder and the connecting slide cylinder. A limit baffle is fixedly connected to one end of the connecting slide cylinder. The limit baffle is rotatably sleeved on the outer wall of the connecting rod. The limit baffle is located at the end of the support cylinder away from the connecting box. A knob is fixedly connected to the end of the connecting rod away from the transmission disc.

[0011] In one alternative: the first reset assembly includes a first spring sleeved on the outer wall of the connecting slide, one end of the first spring contacting the inner wall of the support cylinder, and the other end of the first spring contacting the outer wall of the movable slide.

[0012] In one alternative: a transparent discharge pipe is installed at the bottom of the storage tank, and a storage box is installed at the end of the transparent discharge pipe away from the storage tank. A first electric valve is installed at the port of the transparent discharge pipe in the storage box, and a second electric valve is installed at the port of the storage tank in the inlet pipe. Both the first electric valve and the second electric valve are electrically connected to an external controller via wires.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, through a locking mechanism, can automatically detect and lock the steadily rising pressure value in the storage tank and the inner cavity of the air inlet pipe during the pressurization of pulverized coal. This effectively prevents the pressure value detected during the depressurization process from automatically resetting, so as to maintain the pressure value corresponding to the recorded state, thereby ensuring the stability and traceability of the pressure data. By conveniently unlocking, the pulverized coal start-up pressure gradient can be remeasured according to the new pressure value, thereby further improving the accuracy and reliability of the pulverized coal start-up pressure gradient measurement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the internal structure of the support cylinder of this utility model.

[0016] Figure 3 This is a schematic diagram of the connection structure between the connecting slide and the connecting rotating rod of this utility model.

[0017] Figure 4 This is a schematic diagram of the connection structure between the transmission disc and the movable slider of this utility model.

[0018] Figure 5 For the present utility model Figure 2 A magnified schematic diagram of the structure at point A in the diagram.

[0019] Figure 6For the present utility model Figure 3 A magnified schematic diagram of the structure at point B in the diagram.

[0020] Figure reference numerals: 1. Storage tank; 201. Knob; 202. Limiting baffle; 203. Numerical plate; 204. Connecting slide; 205. Support cylinder; 206. First spring; 207. Positioning block; 208. Moving slide; 209. Limiting guide plate; 2010. Connecting rotating rod; 2011. Transmission disc; 2012. Moving slider; 2013. Connecting pull plate; 2014. Limiting sliding plate; 2015. Fixing rod; 2016. Second spring; 3. Feed pipe; 4. Air inlet pipe; 5. Air compressor; 6. Support frame; 7. Transparent discharge pipe; 8. Storage box; 9. Connecting box. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] In one embodiment, such as Figures 1-6 As shown, an experimental device for measuring the starting pressure gradient of pulverized coal includes a storage tank 1, a feed pipe 3 installed at the top of the storage tank 1, an air inlet pipe 4 fixedly connected to the outer wall of the storage tank 1, a connection box 9 fixedly connected to the bottom end of the air inlet pipe 4, a support frame 6 fixedly connected to the bottom end of the connection box 9, an air compressor 5 installed inside the support frame 6, and the output end of the air compressor 5 fixedly connected to the connection box 9 through an air supply pipe. A transparent discharge pipe 7 is installed at the bottom end of the storage tank 1, and a storage box 8 is installed at the end of the transparent discharge pipe 7 away from the storage tank 1. A first electric valve is installed at the port of the transparent discharge pipe 7 in the storage box 8, and a second electric valve is installed at the port of the feed pipe 3 in the storage tank 1. The first electric valve and the second electric valve are electrically connected to an external controller through wires. A locking mechanism for locking and maintaining the detected data is provided on the connection box 9. The locking mechanism includes: A support cylinder 205 is fixedly connected to one end of the connecting box 9. Two limiting guide plates 209 are symmetrically fixedly connected to the inner wall of the support cylinder 205. A movable slide cylinder 208 is slidably connected inside the support cylinder 205. The movable slide cylinder 208 is slidably sleeved on the outer wall of the two limiting guide plates 209. A connecting slide cylinder 204 is fixedly connected to the end of the movable slide cylinder 208 away from the connecting box 9. The connecting slide cylinder 204 extends to the outside of one end of the support cylinder 205. The connecting slide cylinder 204 is slidably connected to the support cylinder 205. A numerical plate 203 is fixedly connected to the outer wall of the connecting slide cylinder 204. In this embodiment, during use, coal powder is discharged into the inner cavity of storage tank 1 through feed pipe 3. At this time, the external controller is activated to close the second electric valve, and the air compressor 5 is activated to deliver compressed air into the inner cavity of storage tank 1 through air supply pipe, connecting box 9, and air inlet pipe 4, so as to apply pressure to the coal powder. During this process, the locking mechanism can detect and automatically lock the steadily rising pressure value in the inner cavity of storage tank 1 and air inlet pipe 4. When the pressure in the inner cavity of storage tank 1 steadily rises to a specified value, the first electric valve is opened by the external controller, so as to depressurize the inner cavity of storage tank 1. During this process, if the pulverized coal starts to flow, the corresponding value is recorded; if the pulverized coal does not flow, the starting pressure gradient of the pulverized coal is remeasured based on the new pressure value, thereby effectively improving the accuracy and reliability of the measurement. In one embodiment, such as Figures 2-6 As shown, the locking mechanism also includes: A locking assembly is provided on the movable slide 208; The card-connecting components include: Two limiting slide plates 2014 are symmetrically slidably connected inside the movable slide cylinder 208. Two positioning blocks 207 are symmetrically slidably connected inside the movable slide cylinder 208. The two limiting slide plates 2014 are located between the two positioning blocks 207. The two limiting slide plates 2014 are fixedly connected to the two positioning blocks 207 respectively. The outer wall of the end of the two positioning blocks 207 away from the two limiting slide plates 2014 is inclined. The two positioning blocks 207 pass through the movable slide cylinder 208 to the interior of the two limiting guide plates 209 respectively. The ends of the two limiting guide plates 209 that are close to each other are laterally and equidistantly provided with multiple positioning slots that match the outer wall of the positioning blocks 207. The movable slide 208 is provided with a limiting component for limiting the sliding of the limiting slide 2014; The movable slide 208 is equipped with a rotating component for moving the limiting slide 2014; A first reset component for pushing the movable slide 208 to reset is provided on the connecting slide 204; The limit components include: Two fixed rods 2015 are symmetrically fixedly connected inside the movable slide cylinder 208. Two limiting slide plates 2014 are slidably sleeved on the outer walls of the two fixed rods 2015. The positioning block 207 is located between the two fixed rods 2015. A second reset assembly is provided on the fixing rod 2015; The second reset assembly includes two second springs 2016 symmetrically sleeved on the outer wall of the fixed rod 2015. One end of each second spring 2016 contacts the outer wall of the two limiting slide plates 2014, and the other end of each second spring 2016 contacts the inner wall of the movable slide cylinder 208. Through the cooperation of the locking assembly, the limiting assembly and the second reset assembly, the movable slide cylinder 208 can be moved and positioned, effectively preventing the movable slide cylinder 208 from automatically resetting during the pressure relief process. In one embodiment, such as Figures 1-6 As shown, the rotating assembly includes: A transmission disc 2011 is rotatably connected inside the movable slide cylinder 208. Two connecting pull plates 2013 are symmetrically arranged at one end of the transmission disc 2011. The two connecting pull plates 2013 are located between two limiting slide plates 2014. The two connecting pull plates 2013 are fixedly connected to the two limiting slide plates 2014 respectively. A movable slider 2012 is fixedly connected to one end of each connecting pull plate 2013 near the transmission disc 2011. A guide groove for the movable slider 2012 to slide is provided at the contact position between the transmission disc 2011 and the movable slider 2012. The transmission disc 2011 is equipped with a transmission assembly; The transmission components include: A connecting rod 2010 is fixedly connected to the end of the transmission disc 2011 away from the connecting pull plate 2013. The connecting rod 2010 passes through the movable slide 208 to the outside of one end of the connecting slide 204. The connecting rod 2010 is rotatably connected to the movable slide 208 and the connecting slide 204. A limit baffle 202 is fixedly connected to one end of the connecting slide 204. The limit baffle 202 is rotatably sleeved on the outer wall of the connecting rod 2010. The limit baffle 202 is located at the end of the support cylinder 205 away from the connecting box 9. A knob 201 is fixedly connected to the end of the connecting rod 2010 away from the transmission disc 2011. Through the mutual cooperation of the rotating component and the transmission component, the positioning block 207 and the limit guide plate 209 can be driven to separate from each other, thereby releasing the lock on the movable slide 208. In one embodiment, such as Figure 2 As shown, the first reset assembly includes a first spring 206 sleeved on the outer wall of the connecting slide 204. One end of the first spring 206 is in contact with the inner wall of the support cylinder 205, and the other end of the first spring 206 is in contact with the outer wall of the movable slide 208. The first spring 206 can push the movable slide 208 to slide and reset when the lock on the movable slide 208 is released.

[0023] The above embodiment discloses an experimental device for measuring the starting pressure gradient of pulverized coal. In use, pulverized coal is discharged into the inner cavity of storage tank 1 through feed pipe 3. At this time, the external controller is activated to close the second electric valve, and the air compressor 5 is activated to deliver compressed air into the inner cavity of storage tank 1 through air supply pipe, connecting box 9, and air inlet pipe 4, so as to apply pressure to the pulverized coal. During this process, compressed air is used to pressurize the end face of the movable slide 208. As the compressed air gradually increases in pressure, the movable slide 208 slides along the inner wall of the support cylinder 205 and the outer wall of the limiting guide plate 209, and compresses the first spring 206 to contract. At this time, the limiting baffle 202 is separated from the outer wall of the support cylinder 205 by the connecting slide 204 under the push of the movable slide 208. At the same time, the numerical plate 203 is moved synchronously under the drive of the connecting slide 204. Thus, the pressure value of the compressed air in the storage tank 1 and the air inlet pipe 4 can be detected by the numerical plate 203. Simultaneously, the positioning block 207 moves synchronously under the drive of the moving slide cylinder 208. At this time, the positioning block 207, blocked by the inner wall of a positioning slot, pushes the limiting slide plate 2014 to slide along the outer wall of the fixed rod 2015, and the limiting slide plate 2014 compresses the second spring 2016 to retract. At this time, the connecting pull plate 2013, pushed by the limiting slide plate 2014, drives the moving slider 2012 to compress the inner wall of the guide groove. At the same time, the transmission disc 2011, pushed by the moving slider 2012 through the guide groove, drives the knob 201 to rotate through the connecting rotating rod 2010. When the positioning block 207 moves to the end of the next positioning slot, the second spring 2016 rebounds and pushes the limiting slide plate 2014 to insert the positioning block 207 into the interior of the next positioning slot, thereby moving and positioning the moving slide cylinder 208. When the pressure in the inner cavity of storage tank 1 rises steadily to a specified value, the first electric valve is opened by an external controller to depressurize the inner cavity of storage tank 1. At this time, the movable slide 208 can be automatically locked by the engagement of the positioning block 207 and the limiting guide plate 209, effectively preventing the first spring 206 from pushing the movable slide 208 to slide and reset during the depressurization process. During this process, if the coal powder starts to flow, the corresponding value is recorded by the numerical plate 203. If the coal powder does not flow, the knob 201 is turned to drive the transmission plate 2011 to rotate through the connecting rod 2010. This allows the positioning block 207 to separate from the limiting guide plate 209. At the same time, the first spring 206 pushes the moving slide 208 to reset by rebounding. This allows the starting pressure gradient of the coal powder to be remeasured according to the new pressure value, thereby effectively improving the accuracy and reliability of the measurement.

[0024] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An experimental apparatus for measuring the starting pressure gradient of pulverized coal, comprising a storage tank (1), a feed pipe (3) installed at the top of the storage tank (1), an air inlet pipe (4) fixedly connected to the outer wall of the storage tank (1), a connecting box (9) fixedly connected to the bottom end of the air inlet pipe (4), a support frame (6) fixedly connected to the bottom end of the connecting box (9), an air compressor (5) installed inside the support frame (6), and the output end of the air compressor (5) fixedly connected to the connecting box (9) via an air delivery pipe, characterized in that, The connection box (9) is provided with a locking mechanism for locking and maintaining the detected data; The locking mechanism includes: A support cylinder (205) is fixedly connected to one end of the connecting box (9). Two limiting guide plates (209) are symmetrically fixedly connected to the inner wall of the support cylinder (205). A movable slide cylinder (208) is slidably connected inside the support cylinder (205). The movable slide cylinder (208) is slidably sleeved on the outer wall of the two limiting guide plates (209). A connecting slide cylinder (204) is fixedly connected to the end of the movable slide cylinder (208) away from the connecting box (9). The connecting slide cylinder (204) extends to the outside of one end of the support cylinder (205). The connecting slide cylinder (204) is slidably connected to the support cylinder (205). A numerical plate (203) is fixedly connected to the outer wall of the connecting slide cylinder (204).

2. The experimental apparatus for measuring the starting pressure gradient of pulverized coal according to claim 1, characterized in that, The locking mechanism also includes: A locking assembly is provided on the movable slide (208); The engagement component includes: Two limiting slide plates (2014) are symmetrically slidably connected inside the movable slide cylinder (208). Two positioning blocks (207) are symmetrically slidably connected inside the movable slide cylinder (208). The two limiting slide plates (2014) are located between the two positioning blocks (207). The two limiting slide plates (2014) are fixedly connected to the two positioning blocks (207) respectively. The outer wall of the end of the two positioning blocks (207) away from the two limiting slide plates (2014) is inclined. The two positioning blocks (207) respectively penetrate the movable slide cylinder (208) to the interior of the two limiting guide plates (209). The movable slide (208) is provided with a limiting component for limiting the sliding of the limiting slide (2014); The movable slide (208) is provided with a rotating component for driving the limiting slide (2014) to move; The connecting slide (204) is provided with a first reset component for pushing the movable slide (208) to reset.

3. The experimental apparatus for measuring the starting pressure gradient of pulverized coal according to claim 2, characterized in that, The limiting component includes: Two fixed rods (2015) are symmetrically fixedly connected inside the movable slide (208), and the two limiting slide plates (2014) are slidably sleeved on the outer walls of the two fixed rods (2015). The positioning block (207) is located between the two fixed rods (2015). A second reset assembly is provided on the fixing rod (2015).

4. The experimental apparatus for measuring the starting pressure gradient of pulverized coal according to claim 3, characterized in that, The second reset assembly includes two second springs (2016) symmetrically sleeved on the outer wall of the fixed rod (2015). One end of each of the two second springs (2016) contacts the outer wall of the two limiting slide plates (2014), and the other end of each of the two second springs (2016) contacts the inner wall of the movable slide cylinder (208).

5. The experimental apparatus for measuring the starting pressure gradient of pulverized coal according to claim 2, characterized in that, The rotating assembly includes: A transmission disc (2011) is rotatably connected inside the movable slide (208). Two connecting plates (2013) are symmetrically arranged at one end of the transmission disc (2011). The two connecting plates (2013) are located between two limiting slide plates (2014). The two connecting plates (2013) are fixedly connected to the two limiting slide plates (2014) respectively. A movable slider (2012) is fixedly connected to one end of each connecting plate (2013) near the transmission disc (2011). A guide groove for the movable slider (2012) to slide is provided at the junction of the transmission disc (2011) and the movable slider (2012). The transmission disk (2011) is equipped with a transmission component.

6. The experimental apparatus for measuring the starting pressure gradient of pulverized coal according to claim 5, characterized in that, The transmission assembly includes: A connecting rod (2010) is fixedly connected to the end of the transmission disc (2011) away from the connecting pull plate (2013). The connecting rod (2010) passes through the movable slide (208) to the outside of one end of the connecting slide (204). The connecting rod (2010) is rotatably connected to the movable slide (208) and the connecting slide (204). A limit baffle (202) is fixedly connected to one end of the connecting slide (204). The limit baffle (202) is rotatably sleeved on the outer wall of the connecting rod (2010). The limit baffle (202) is located at the end of the support cylinder (205) away from the connecting box (9). A knob (201) is fixedly connected to the end of the connecting rod (2010) away from the transmission disc (2011).

7. The experimental apparatus for measuring the starting pressure gradient of pulverized coal according to claim 2, characterized in that, The first reset assembly includes a first spring (206) sleeved on the outer wall of the connecting slide (204), one end of the first spring (206) is in contact with the inner wall of the support cylinder (205), and the other end of the first spring (206) is in contact with the outer wall of the movable slide (208).

8. The experimental apparatus for measuring the starting pressure gradient of pulverized coal according to claim 1, characterized in that, A transparent discharge pipe (7) is installed at the bottom of the storage tank (1). A storage box (8) is installed at the end of the transparent discharge pipe (7) away from the storage tank (1). A first electric valve is installed at the port of the transparent discharge pipe (7) in the storage box (8). A second electric valve is installed at the port of the inlet pipe (3) in the storage tank (1). The first electric valve and the second electric valve are electrically connected to an external controller through wires.

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