Pull-type powder pressurized conveying device

Abstract

The present invention discloses a pulling type powder pressurized conveying device, which comprises a double-rod hydraulic cylinder, a first conveying cylinder and a second conveying cylinder, wherein the double-rod hydraulic cylinder is located between the first conveying cylinder and the second conveying cylinder; the first conveying cylinder is provided with a first normal pressure feed port and a first high pressure discharge port, and the first conveying cylinder is provided with a first sheet-shaped piston and a first tubular piston; the second conveying cylinder is provided with a second normal pressure feed port and a second high pressure discharge port, and the second conveying cylinder is provided with a second sheet-shaped piston and a second tubular piston; the left piston rod and the right piston rod of the double-rod hydraulic cylinder are respectively connected with the first sheet-shaped piston and the second sheet-shaped piston; the first conveying cylinder and the second conveying cylinder are respectively provided with a first driving mechanism and a second driving mechanism for driving the first tubular piston and the second tubular piston to move. The present invention realizes continuous conveying of powder, reduces energy consumption, and avoids the emission of inert gas.

Description

Technical Field

[0001] The invention relates to the technical field of powder pressurized conveying, and in particular to a pulling type powder pressurized conveying device. Background Art

[0002] Powder is a collection of numerous small particles. Common powders include pulverized coal, flour or cement powder.

[0003] The pressurized conveying process of powders is involved in many fields such as coal chemical industry, metallurgy, and food processing. Coal gasification, especially pressurized pulverized coal gasification, is a clean coal utilization technology that has developed rapidly in recent years and has been used more and more widely. Pressurized pulverized coal conveying technology is an indispensable technical link in pressurized pulverized coal gasification technology. Pressurized pulverized coal conveying technology is to increase the dry coal powder from normal pressure to a certain high pressure to achieve combustion and gasification of pulverized coal under high pressure.

[0004] The pulverized coal pressurized conveying technology currently used in industry is mainly lock hopper pressurized conveying, the principle of which is to use high-pressure inert gas to flush into the pulverized coal pressurized lock hopper to increase the pressure, and then transport the pulverized coal to the pulverized coal storage tank after the pressure is balanced with the pulverized coal storage tank, and use high-pressure inert gas to replace the solid pulverized coal in the lock hopper, and then discharge the high-pressure inert gas in the pulverized coal lock hopper, and repeat the cycle. For example, CN1376761A discloses a method and device for feeding dry coal powder during the pressurized gasification of dry coal powder, the device includes an intermediate material tank for storing pulverized coal with an inert gas inlet device on a conical surface, a high-pressure pulverized coal bin connected to the bottom of the intermediate material tank by a pipeline, and the intermediate material tank is pressurized with inert gas to make the pressure in the intermediate material tank the same as the high-pressure pulverized coal bin connected to it, and then the pulverized coal is transported to the high-pressure pulverized coal bin. The above technology mainly has the following technical defects:

[0005] 1. The pressurization process requires the emission of a large amount of inert gases such as N2, CO2, etc., causing greater environmental pollution;

[0006] 2. The efficiency of the pressurized conveying process is low and cannot be continuously adjusted;

[0007] 3. Pressurized transportation requires high-pressure resistant equipment, which is large in size and expensive;

[0008] 4. High energy consumption, and high requirements on the sealing and pressure resistance of powder conveying pipelines and pipeline auxiliary parts. Summary of the invention

[0009] In order to solve the above problems, the present invention provides a pulling type powder pressurized conveying device, which does not need to discharge inert gas and realizes continuous conveying of powder.

[0010] To achieve the above-mentioned purpose, the pull-type powder pressurized conveying device of the present invention includes a double-rod hydraulic cylinder, a first conveying cylinder and a second conveying cylinder, the double-rod hydraulic cylinder is located between the first conveying cylinder and the second conveying cylinder; the first conveying cylinder is provided with a first normal-pressure feed port and a first high-pressure discharge port, the first conveying cylinder is provided with a first sheet-shaped piston and a first tubular piston, a first accommodating space for storing powder can be formed between the first sheet-shaped piston and the first tubular piston, when the first sheet-shaped piston and the first tubular piston move in the first conveying cylinder, the first accommodating space can be respectively connected with the first normal-pressure feed port and the first high-pressure discharge port; the second conveying cylinder is provided with a second normal-pressure feed port and a first high-pressure discharge port a second high-pressure discharge port, a second sheet-shaped piston and a second cylindrical piston are arranged in the second conveying cylinder, a second accommodating space for storing powder can be formed between the second sheet-shaped piston and the second cylindrical piston, and when the second sheet-shaped piston and the second cylindrical piston move in the second conveying cylinder, the second accommodating space can be respectively connected with the second normal-pressure feed port and the second high-pressure discharge port; the left piston rod of the double-rod hydraulic cylinder is fixedly connected with the first sheet-shaped piston, and the right piston rod of the double-rod hydraulic cylinder is fixedly connected with the second sheet-shaped piston; the first conveying cylinder and the second conveying cylinder are respectively provided with a first driving mechanism and a second driving mechanism for driving the first cylindrical piston and the second cylindrical piston to move.

[0011] Preferably, a first T-shaped connecting rod is provided in the first conveying cylinder, the large end of the first T-shaped connecting rod is placed in the first cylindrical piston, the first T-shaped connecting rod passes through the first cylindrical piston, the small end of the first T-shaped connecting rod is fixedly connected to the first sheet-like piston, and the first T-shaped connecting rod can slide relative to the first cylindrical piston; a second T-shaped connecting rod is provided in the second conveying cylinder, the large end of the second T-shaped connecting rod is placed in the second cylindrical piston, the second T-shaped connecting rod passes through the second cylindrical piston, the small end of the second T-shaped connecting rod is fixedly connected to the second sheet-like piston, and the second T-shaped connecting rod can slide relative to the second cylindrical piston.

[0012] Preferably, the first conveying cylinder and the second conveying cylinder are symmetrically arranged at two ends of the double-rod hydraulic cylinder.

[0013] Preferably, a first combined sealing ring is provided between the first sheet-like piston and the first conveying cylinder, and between the first tubular piston and the first conveying cylinder; a second combined sealing ring is provided between the second sheet-like piston and the second conveying cylinder, and between the second tubular piston and the second conveying cylinder.

[0014] Preferably, the first combined sealing ring and the second combined sealing ring include a V-shaped cloth-inserted sealing ring and a U-shaped sealing ring, a spring sheet with a U-shaped cross-section is arranged in the groove of the U-shaped sealing ring, and the V-shaped cloth-inserted sealing ring is arranged on one side of the opening of the U-shaped sealing ring.

[0015] Compared with the existing pulverized coal pressure conveying device, the pull-type powder pressure conveying device of the present invention has low pressure resistance requirements for the conveying path, low energy consumption, reduced equipment cost, and avoids the emission of inert gas. Through the pull-type powder pressure conveying device of the present invention, continuous conveying of powder is achieved, energy consumption is reduced, and the emission of inert gas is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the pulling type powder pressurized conveying device of the present invention, wherein the first conveying cylinder is in a feeding state and the second conveying cylinder is in a discharging state;

[0017] Figure 2 It is a schematic diagram of the first conveying cylinder of the pull-type powder pressurized conveying device of the present invention being in a discharging state and the second conveying cylinder being in an exhausting state;

[0018] Figure 3 It is a schematic diagram of the first conveying cylinder of the pull-type powder pressurized conveying device of the present invention being in a discharging state and the second conveying cylinder being in a feeding state;

[0019] Figure 4 It is a schematic diagram of the first conveying cylinder of the pull-type powder pressurized conveying device of the present invention being in an exhaust state and the second conveying cylinder being in a discharge state;

[0020] Figure 5 for Figure 4 A partial enlarged view of the middle A area;

[0021] Figure 6 Schematic diagram of the arrangement of combined seal. DETAILED DESCRIPTION

[0022] In the present invention, "left", "right" and the like are only used to indicate a relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0023] In order to keep the following description of the disclosed embodiments of the present invention clear and concise, the present invention omits the detailed description of known functions and known components. Specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 5As shown, the pulling type powder pressurized conveying device of the present invention comprises a double-rod hydraulic cylinder 10 , a first conveying cylinder 20 and a second conveying cylinder 30 , wherein the double-rod hydraulic cylinder 10 is located between the first conveying cylinder 20 and the second conveying cylinder 30 .

[0025] The first conveying cylinder 20 is provided with a first normal-pressure feed port 201 and a first high-pressure discharge port 202. A first sheet-shaped piston 21 and a first cylindrical piston 22 are provided in the first conveying cylinder 20. A first accommodating space 203 for storing powder can be formed between the first sheet-shaped piston 21 and the first cylindrical piston 22. When the first sheet-shaped piston 21 and the first cylindrical piston 22 move in the first conveying cylinder 20, the first accommodating space 203 can be communicated with the first normal-pressure feed port 201 and the first high-pressure discharge port 202 respectively. The second conveying cylinder 30 is provided with a second normal-pressure feed port 301 and a second high-pressure discharge port 302. A second sheet-shaped piston 31 and a second cylindrical piston 32 are provided in the second conveying cylinder 30. A second accommodating space 303 for storing powder can be formed between the second sheet-shaped piston 31 and the second cylindrical piston 32. When the second sheet-shaped piston 31 and the second cylindrical piston 32 move in the second conveying cylinder 30, the second accommodating space 303 can be connected with the second normal-pressure feed port 301 and the second high-pressure discharge port 302 respectively. When the powder is conveyed in the first conveying cylinder 20, the first accommodating space 203 is connected with the first normal pressure feed port 201, and the powder enters the first accommodating space 203. Then, as the first sheet-shaped piston 21 and the first cylindrical piston 22 move in the first conveying cylinder 20, the powder moves with the first sheet-shaped piston 21 and the first cylindrical piston 22 in the first accommodating space 203. When the first accommodating space 203 moves to communicate with the first high-pressure discharge port 202, high-pressure gas enters the first accommodating space 203, and the powder is discharged. The process of conveying powder in the second conveying cylinder 30 is similar to that of conveying powder in the first conveying cylinder 20, and will not be repeated here.

[0026] The left piston rod 11 of the double-rod hydraulic cylinder 10 is fixedly connected to the first sheet-shaped piston 21, and the right piston rod 12 of the double-rod hydraulic cylinder 10 is fixedly connected to the second sheet-shaped piston 31. By driving the first sheet-shaped piston 21 and the second sheet-shaped piston 31 simultaneously by the double-rod hydraulic cylinder 10, the first high-pressure discharge port 202 and the second high-pressure discharge port 302 can be discharged in turn, thereby realizing continuous conveying of powder.

[0027] The first delivery cylinder 20 and the second delivery cylinder 30 are respectively provided with a first driving mechanism 221 and a second driving mechanism 321 for driving the first cylindrical piston 22 and the second cylindrical piston 32 to move. The first driving mechanism 221 and the second driving mechanism 321 can be hydraulic cylinders, that is, the first cylindrical piston 22 and the second cylindrical piston 32 are driven to move by two hydraulic cylinders. In the embodiment of the present invention, the first driving mechanism 221 and the second driving mechanism 321 can be hydraulic cylinders. Figure 5 The structure in Figure 5 Only the structure of the second driving mechanism 321 is shown in the figure. The second driving mechanism 321 is a fixed piston rod. One end of the fixed piston rod is fixed to the second delivery cylinder 30, and the other end is fixed with an annular piston. The annular piston is placed in the cylinder of the second tubular piston 32. The annular piston divides the cylinder of the second tubular piston 32 into left and right chambers. Two oil passages are provided in the fixed piston rod to connect the left and right chambers respectively. Oil is supplied to the left and right chambers through the two oil passages, so that the second tubular piston 32 can be driven to move in the second delivery cylinder 30. The structures of the first driving mechanism 221 and the second driving mechanism 321 are the same, and the structure of the first driving mechanism 221 is not repeated here.

[0028] The distance between the first high-pressure outlet 202 and the second high-pressure outlet 302 is smaller than that between the first normal-pressure feed port 201 and the second normal-pressure feed port 301, that is, the first high-pressure outlet 202 and the second high-pressure outlet 302 are respectively arranged at one end of the first conveying cylinder 20 and the second conveying cylinder 30 close to the double-rod hydraulic cylinder 10. The first cylindrical piston 22 and the second cylindrical piston 32 are cylindrical structures, which can respectively close the first normal-pressure feed port 201 and the second normal-pressure feed port 301 during the movement, so as to prevent the powder from entering the internal non-conveying area of ​​the first conveying cylinder 20 and the second conveying cylinder 30.

[0029] When the pulling type powder pressurizing conveying device of the present invention is used, taking one cycle as an example, at the initial position, as Figure 1As shown, the first conveying cylinder 20 is in the feeding state, and the second conveying cylinder 30 is in the discharging state. The first sheet-shaped piston 21 and the first cylindrical piston 22 are pulled apart to form the first accommodating space 203. The first accommodating space 203 is under negative pressure, and the powder is sucked into the first accommodating space 203 from the first normal-pressure feed port 201. After the feeding is completed, the double-rod hydraulic cylinder 10 drives the first sheet-shaped piston 21 to move toward the direction close to the double-rod hydraulic cylinder 10, and the first cylindrical piston 22 simultaneously moves toward the direction close to the double-rod hydraulic cylinder 10, so that the first accommodating space 203 moves from being connected with the first normal-pressure feed port 201 to being connected with the first high-pressure discharge port 202. At the same time, the double-rod hydraulic cylinder 10 drives the second sheet-shaped piston 31 to move away from the double-rod hydraulic cylinder 10, and gradually approaches the second cylindrical piston 32, so that the gas in the second accommodating space 303 can be discharged. Figure 2 The state shown; after the second sheet-like piston 31 and the second cylindrical piston 32 are close to each other, the second driving mechanism 321 drives the second cylindrical piston 32 to move rightward, and can make the moving speed of the second cylindrical piston 32 greater than the moving speed of the second sheet-like piston 31, so that the second cylindrical piston 32 and the second sheet-like piston 31 are moved into place, the second cylindrical piston 32 and the second sheet-like piston 31 are pulled apart to a set distance and negative pressure is formed, and the second accommodating space 303 formed between the second cylindrical piston 32 and the second sheet-like piston 31 is connected to the second normal pressure feed port 301 and starts feeding, as shown in FIG. Figure 3 The state shown; after the feeding of the second accommodating space 303 is completed, the double-rod hydraulic cylinder 10 drives the second sheet piston 31 to move toward the direction close to the double-rod hydraulic cylinder 10, that is, to the left, and the second tubular piston 32 simultaneously moves toward the direction close to the double-rod hydraulic cylinder 10, so that the second accommodating space 303 moves from being connected with the second normal-pressure feed port 301 to being connected with the second high-pressure discharge port 302. At the same time, the double-rod hydraulic cylinder 10 drives the first sheet piston 21 to approach the first tubular piston 22, so that the gas in the first accommodating space 203 can be discharged, as shown in FIG. Figure 4 After the first sheet-like piston 21 approaches the first cylindrical piston 22, the first driving mechanism 221 drives the first sheet-like piston 21 to move to the left, and the moving speed of the first cylindrical piston 22 can be greater than the moving speed of the first sheet-like piston 21, so that the first cylindrical piston 22 and the first sheet-like piston 21 are moved into place, as shown in the state ... Figure 1 In the state shown, one cycle of powder conveying is completed.

[0030] During the powder conveying process, the sizes of the first accommodating space 203 and the second accommodating space 303 of the pull-type powder pressurized conveying device of the present invention should remain unchanged to prevent the powder from being squeezed, that is, the distance between the first sheet-like piston 21 and the first cylindrical piston 22, and the distance between the second sheet-like piston 31 and the second cylindrical piston 32 remain unchanged during the powder conveying process. This distance can be set according to the distance between the first normal pressure feed port 201 and the first high pressure outlet port 202 and the distance between the second normal pressure feed port 301 and the second high pressure outlet port 302, so that the first normal pressure feed port 201 and the first high pressure outlet port 202 cannot be connected to the first accommodating space 203 at the same time, and the second normal pressure feed port 301 and the second high pressure outlet port 302 cannot be connected to the second accommodating space 303 at the same time.

[0031] The distance between the first sheet-like piston 21 and the first cylindrical piston 22, as well as the distance between the second sheet-like piston 31 and the second cylindrical piston 32 remain unchanged during the powder conveying process, which can be achieved by the cooperation of the double-rod hydraulic cylinder 10 and the first driving mechanism 221 and the second driving mechanism 321. As a preferred embodiment of the present invention, the first sheet-like piston 21 and the second sheet-like piston 31 can respectively pull the first cylindrical piston 22 and the second cylindrical piston 32 to move during the powder conveying process. Specifically: a first T-shaped connecting rod 23 is arranged in the first conveying cylinder 20, and the large end of the first T-shaped connecting rod 23 is placed in the first cylindrical piston 22, the first T-shaped connecting rod 23 passes through the first cylindrical piston 22, and the small end of the first T-shaped connecting rod 23 is fixedly connected to the first sheet-like piston 21, and the first T-shaped connecting rod 23 is fixedly connected to the first sheet-like piston 21. The rod 23 can slide relative to the first cylindrical piston 22. When the first sheet piston 21 moves to the right, the large head end of the first T-shaped connecting rod 23 abuts against the inner side of the end of the first cylindrical piston 22, which can pull the first cylindrical piston 22 to move synchronously; similarly, a second T-shaped connecting rod 33 is arranged in the second conveying cylinder 30, and the large head end of the second T-shaped connecting rod 33 is placed in the second cylindrical piston 32. The second T-shaped connecting rod 33 passes through the second cylindrical piston 32, and the small head end of the second T-shaped connecting rod 33 is fixedly connected to the second sheet piston 31. The second T-shaped connecting rod 33 can slide relative to the second cylindrical piston 32. When the second sheet piston 31 moves to the right, the large head end of the second T-shaped connecting rod 33 abuts against the inner side of the end of the second cylindrical piston 32, which can pull the second cylindrical piston 32 to move synchronously.

[0032] The first delivery cylinder 20 and the second delivery cylinder 30 are symmetrically disposed at two ends of the double-rod hydraulic cylinder 10 .

[0033] A first combined seal ring (not shown) is provided between the first sheet-like piston 21 and the first delivery cylinder 20, and between the first tubular piston 22 and the first delivery cylinder 20; similarly, a second combined seal ring 42, 41 is provided between the second sheet-like piston 31 and the second delivery cylinder 30, and between the second tubular piston 32 and the second delivery cylinder 30. The first combined seal ring and the second combined seal ring have the same structure. Figure 6 The schematic diagram of the arrangement of the combined seal is shown. The second combined seal ring 41 includes a V-shaped cloth seal ring 411 and a U-shaped seal ring 412. A spring sheet 413 with a U-shaped cross section is arranged in the groove of the U-shaped seal ring 412. The V-shaped cloth seal ring 411 is arranged on the opening side of the U-shaped seal ring 412. The V-shaped cloth seal ring 411 is used to scrape off the powder, so that the amount of powder entering the main seal is greatly reduced. The U-shaped seal ring 412 is the main seal, and the spring sheet 413 is used for compensating sealing to provide a reasonable resilience for the U-shaped seal ring 412. The surface of the U-shaped seal ring 412 is covered with self-lubricating and wear-resistant materials, which can achieve a good sealing effect and effectively increase the service life of the seal. The V-shaped cloth seal ring of the first combined seal ring and the V-shaped cloth seal ring of the second combined seal ring are respectively arranged close to the first accommodating space 203 or the second accommodating space 303.

[0034] As mentioned above, the exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings. It should be understood that the present invention is not intended to limit the scope of protection of the present invention by these specific details. Without departing from the spirit and scope of the present invention, the structure and features of the exemplary embodiments may be changed to be equivalent or similar, and these changes will also fall within the scope of protection determined by the claims attached to the present invention.

Claims

1. A pulling type powder pressurized conveying device, It is characterized in that It includes a double-rod hydraulic cylinder, a first delivery cylinder and a second delivery cylinder. The double-rod hydraulic cylinder is located between the first delivery cylinder and the second delivery cylinder; The first conveying cylinder is provided with a first normal-pressure feed port and a first high-pressure discharge port, and the first conveying cylinder is provided with a first sheet-shaped piston and a first cylindrical piston, and a first accommodating space for storing powder can be formed between the first sheet-shaped piston and the first cylindrical piston, and when the first sheet-shaped piston and the first cylindrical piston move in the first conveying cylinder, the first accommodating space can be communicated with the first normal-pressure feed port and the first high-pressure discharge port respectively; The second conveying cylinder is provided with a second normal-pressure feed port and a second high-pressure discharge port, and the second conveying cylinder is provided with a second sheet-shaped piston and a second cylindrical piston, and a second accommodating space for storing powder can be formed between the second sheet-shaped piston and the second cylindrical piston, and when the second sheet-shaped piston and the second cylindrical piston move in the second conveying cylinder, the second accommodating space can be communicated with the second normal-pressure feed port and the second high-pressure discharge port respectively; The left piston rod of the double-rod hydraulic cylinder is fixedly connected to the first sheet-like piston, and the right piston rod of the double-rod hydraulic cylinder is fixedly connected to the second sheet-like piston; The first delivery cylinder and the second delivery cylinder are respectively provided with a first driving mechanism and a second driving mechanism for driving the first tubular piston and the second tubular piston to move; A first T-shaped connecting rod is arranged in the first delivery cylinder, the large end of the first T-shaped connecting rod is placed in the first cylindrical piston, the first T-shaped connecting rod passes through the first cylindrical piston, the small end of the first T-shaped connecting rod is fixedly connected to the first sheet-shaped piston, and the first T-shaped connecting rod can slide relative to the first cylindrical piston; A second T-shaped connecting rod is arranged in the second delivery cylinder, the large end of the second T-shaped connecting rod is placed in the second cylindrical piston, the second T-shaped connecting rod passes through the second cylindrical piston, the small end of the second T-shaped connecting rod is fixedly connected to the second sheet-shaped piston, and the second T-shaped connecting rod can slide relative to the second cylindrical piston; The first conveying cylinder and the second conveying cylinder are symmetrically arranged at two ends of the double-rod hydraulic cylinder.

2. The pulling type powder pressurized conveying device according to claim 1, It is characterized in that A first combined sealing ring is provided between the first sheet-like piston and the first conveying cylinder, and between the first tubular piston and the first conveying cylinder; a second combined sealing ring is provided between the second sheet-like piston and the second conveying cylinder, and between the second tubular piston and the second conveying cylinder.

3. The pulling type powder pressurized conveying device according to claim 2, It is characterized in that The first combined sealing ring and the second combined sealing ring include a V-shaped cloth-inserted sealing ring and a U-shaped sealing ring. A spring sheet with a U-shaped cross-section is arranged in the groove of the U-shaped sealing ring, and the V-shaped cloth-inserted sealing ring is arranged on one side of the opening of the U-shaped sealing ring.

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