Constant-volume feeder

Abstract

The utility model provides a constant volume feeder which comprises a lifting driving device, a fixing seat, a pull rod, a feeding cylinder, a fixing plate, two telescopic sleeves and a plurality of connecting rods, the connecting rods are connected between the fixing seat and the feeding cylinder, the lifting driving device is arranged on the fixing seat, a first end of the pull rod is connected with the lifting driving device, and a second end of the pull rod is connected with the feeding cylinder. A first sealing piece and a second sealing piece are arranged at the second end of the pull rod and correspond to a feeding port and a discharging port of the discharging barrel respectively, the fixing plate is arranged between the fixing base and the discharging barrel, a center hole is formed in the middle of the fixing plate, the pull rod is movably inserted into the center hole, and the pull rod is sleeved with the two telescopic sleeves. The two telescopic sleeves are arranged on the upper side and the lower side of the fixing plate respectively, one end of each telescopic sleeve is in sealed connection with the pull rod, the other end of each telescopic sleeve is in sealed connection with the fixing plate, and the telescopic sleeves cover the outer side of the center hole. The pull rod can be prevented from deviating towards one side, and local abrasion is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic aluminium production equipment field, concretely relates to a constant volume unloader. BACKGROUND

[0002] Constant volume unloader is the key equipment in the process of electrolytic aluminium, and its role is to add alumina powder to the electrolytic tank in time and quantity. Constant volume unloader generally includes pull rod and unloading cylinder, the top of unloading cylinder has feed inlet, and the pull rod is provided with sealing cone for realizing the opening and closing of feed inlet. Because the pull rod will be offset due to the effect of alumina in the tank, the center of pull rod cannot coincide with the center of unloading cylinder, and then the contact surface between sealing cone and feed inlet will be locally abraded, the more the opening and closing times are, the more serious the abrasion is, so that the irregular small gap between sealing cone and the inner wall of feed inlet is generated. In the unloading process, although sealing cone closes the feed inlet, part of alumina particles will enter the unloading cylinder from the gap, leading to the failure of quantitative unloading and affecting the normal production of electrolytic aluminium. SUMMARY

[0003] The utility model aims at providing a constant volume unloader capable of preventing the pull rod from being offset to the periphery.

[0004] In order to realize the above purpose, the utility model provides a constant volume unloader, which comprises a lifting driving device, a fixed seat, a pull rod, an unloading cylinder, a fixed plate, two telescopic sleeves and a plurality of connecting rods, the connecting rods are connected between the fixed seat and the unloading cylinder, the lifting driving device is arranged on the fixed seat, the first end of the pull rod is connected with the lifting driving device, the second end of the pull rod is provided with a first sealing element and a second sealing element, the first sealing element and the second sealing element are arranged correspondingly with the feed inlet and the discharge port of the unloading cylinder, the fixed plate is arranged between the fixed seat and the unloading cylinder, the middle part of the fixed plate is provided with a center hole, the pull rod is movably inserted into the center hole, the two telescopic sleeves are sleeved on the pull rod, and the two telescopic sleeves are arranged on the upper and lower sides of the fixed plate respectively, one end of the telescopic sleeve is sealingly connected with the pull rod, the other end of the telescopic sleeve is sealingly connected with the fixed plate, and the telescopic sleeve covers the outside of the center hole.

[0005] It can be seen from the above scheme that, through the above setting, the pull rod can be prevented from being offset to the periphery, the center of the pull rod and the first sealing element is ensured to coincide with the center of the feed inlet, local abrasion between the contact surface of the first sealing element and the feed inlet is avoided, the gap between the first sealing element and the feed inlet in the closed state of the feed inlet is avoided, the feed inlet can be effectively sealed, and the accuracy of quantitative unloading is improved.

[0006] Further, one end of the telescopic sleeve is fixedly connected with the pull rod, the other end of the telescopic sleeve is fixedly connected with the fixed plate, and the telescopic sleeve can be moved up and down.

[0007] From the above scheme can be seen, the telescopic sleeve can be telescopic motion, avoid affecting the normal up and down movement of the pull rod.

[0008] Further, one end of the telescopic sleeve is connected with the pull rod through the first annular fixing member, and the other end of the telescopic sleeve is connected with the fixed plate through the second annular fixing member, and the first annular fixing member and the second annular fixing member extend along the circumference of the telescopic sleeve.

[0009] From the above scheme can be seen, through the above setting, it is beneficial to ensure that the two ends of the telescopic sleeve are firmly connected, and it is avoided to be easily detached.

[0010] Further, a linear bearing is arranged in the center hole, and the pull rod is inserted into the linear bearing.

[0011] From the above scheme can be seen, through the above setting, it is beneficial to reduce the friction between the pull rod and the fixed plate, and facilitate the up and down movement of the pull rod.

[0012] Further, the distance from the fixed plate to the discharging cylinder is less than or equal to the distance from the fixed plate to the fixed seat.

[0013] From the above scheme can be seen, through the above setting, it is ensured that the pull rod, especially the lower part of the pull rod, will not deviate to the surrounding.

[0014] Further, the fixed plate is also provided with a plurality of mounting holes, the mounting holes are arranged one by one corresponding to the connecting rods, and the connecting rods are inserted into the mounting holes.

[0015] From the above scheme can be seen, through the above setting, it is beneficial to fix the fixed plate.

[0016] Further, the hole wall of the mounting hole is provided with a closed structure.

[0017] Further, the hole wall of the mounting hole is provided with a vacancy, and the vacancy is arranged on the side of the mounting hole away from the center of the fixed plate to form an opening.

[0018] From the above scheme can be seen, through the above setting, it is convenient to connect the fixed plate with the connecting rod, and has the advantage of convenient installation operation.

[0019] Further, the upper part of the discharging cylinder is provided with a connecting seat, the feeding port is arranged on the connecting seat, the feeding port is provided with a curved surface, the curved surface is arranged on the upper inner wall of the feeding port, and the curved surface is in linear contact with the first sealing member. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure diagram of the feeding state of the constant volume discharger in the prior art.

[0021] Figure 2 is a structure diagram of the discharging state of the constant volume discharger in the prior art.

[0022] Figure 3 is a structural diagram of an embodiment of the utility model.

[0023] Figure 4 is Figure 3 is an enlarged view of part A in the figure.

[0024] Figure 5 is a structural diagram of a fixing plate in an embodiment of the utility model.

[0025] Figure 6 is a structural diagram of another fixing plate in an embodiment of the utility model.

[0026] Figure 7 is Figure 3 is an enlarged view of part B in the figure.

[0027] The utility model is further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0028] Referring to Figure 1 and Figure 2 , the existing constant-volume feeder 10 is arranged in the tank 20, the discharge cylinder of the constant-volume feeder 10 is arranged at the lower outer side of the tank 20, and the feeding port 201 of the discharge cylinder is in communication with the inside of the tank 20. When feeding, the feeding port 201 of the discharge cylinder is opened, the discharge port 202 is closed, the alumina particles in the tank 20 enter the discharge cylinder from the feeding port 201, and the alumina particles just fill the discharge cylinder, realizing the quantitative function; when discharging, the feeding port 201 of the discharge cylinder is closed, the discharge port 202 is opened, and the alumina particles in the discharge cylinder 4 flow out from the discharge port 202.

[0029] Referring to Figures 3 to 5 , the constant-volume feeder provided by the embodiment comprises a lifting driving device 1, a fixing seat 2, a pull rod 3, a discharge cylinder 4 and four connecting rods 5.

[0030] The connecting rods 5 are connected between the fixing seat 2 and the discharge cylinder 4, and the four connecting rods 5 are arranged on the four sides of the discharge cylinder 4 respectively. The lifting driving device 1 can be a pneumatic cylinder or a hydraulic cylinder, the lifting driving device 1 is arranged on the fixing seat 2, and the driving rod of the lifting driving device 1 extends downward through the fixing seat 2.

[0031] The first end of the pull rod 3 is connected with the driving rod of the lifting driving device 1, and the second end of the pull rod 3 extends downward to the feeding cylinder 4. Specifically, the second end of the pull rod 3 is arranged with the first sealing piece 6 and the second sealing piece 7 in sequence from top to bottom, the first sealing piece 6 and the second sealing piece 7 are arranged correspondingly with the feeding port 41 and the discharging port 42 of the feeding cylinder 4 respectively, and the distance between the first sealing piece 6 and the second sealing piece 7 is slightly greater than the distance between the feeding port 41 and the discharging port 42, so that when the first sealing piece 6 is in sealing connection with the feeding port 41, the second sealing piece 7 is at a certain distance from the discharging port 42, and when the second sealing piece 7 is in sealing connection with the discharging port 42, the first sealing piece 6 is at a certain distance from the feeding port 41. That is, when the feeding port 41 is closed, the discharging port 42 is opened; when the discharging port 42 is closed, the feeding port 41 is opened.

[0032] The constant-volume feeder of the embodiment further comprises a fixed plate 8a / 8b and two telescopic sleeves 9. The fixed plate 8a / 8b is arranged between the fixed seat 2 and the feeding cylinder 4. In the up-down direction, the distance from the fixed plate 8a / 8b to the feeding cylinder 4 is less than or equal to the distance from the fixed plate 8a / 8b to the fixed seat 2. Preferably, the fixed plate 8a / 8b is arranged close to the feeding cylinder 4.

[0033] A central hole 81a / 81b is formed in the middle of the fixed plate 8a / 8b, and the pull rod 3 is movably inserted into the central hole 81a / 81b. The two telescopic sleeves 9 are both arranged on the pull rod 3, and the two telescopic sleeves 9 are arranged on the upper and lower sides of the fixed plate 8a / 8b respectively. One end of the telescopic sleeve 9 is in sealing connection with the pull rod 3, the other end of the telescopic sleeve 9 is in sealing connection with the fixed plate 8a / 8b, and the telescopic sleeve 9 covers the outside of the central hole 81a. The arrangement of the telescopic sleeve 9 neither hinders the normal up-down movement of the pull rod 3, nor blocks the alumina particles from entering the gap between the central hole 81a / 81b and the pull rod 3, thereby avoiding the influence of the alumina particles on the normal up-down movement of the pull rod 3.

[0034] The first end of the telescopic sleeve 9 is fixedly connected with the pull rod 3 through a first annular fixing piece 91, and the second end of the telescopic sleeve 9 is fixedly connected with the fixed plate 8a / 8b through a second annular fixing piece 92. When the pull rod 3 moves up and down, one end of the telescopic sleeve 9 moves up and down, and the other end is fixed, so that the telescopic sleeve 9 can move up and down. The first annular fixing piece 91 and the second annular fixing piece 92 both extend along the circumference of the telescopic sleeve 9, ensuring that the telescopic sleeve 9 is in sealing connection in the circumferential direction.

[0035] The first annular fixing piece 91 tightly abuts the first end of the telescopic sleeve 9 to the outer circumferential wall of the pull rod 3, preventing alumina particles from entering the inside of the telescopic sleeve 9. The first annular fixing piece 91 comprises two first half-arc pieces (not shown in the figure), the first ends of the two first half-arc pieces are hingedly connected, and the second ends of the two first half-arc pieces are detachably connected, which includes but is not limited to screw locking connection, clamping and the like.

[0036] The second annular fixing member 92 tightly abuts the second end of the telescopic sleeve 9 to the surface of the fixing plate 8a / 8b, preventing alumina particles from entering the interior of the telescopic sleeve 9. The second annular fixing member 92 comprises two second half-arc members (not shown in the figure), the first ends of the two second half-arc members are hingedly connected, and the second ends of the two second half-arc members are adjacent and detachably connected to the fixing plate 8a / 8b, including but not limited to screw locking connection, clamping, etc.

[0037] In order to reduce the friction between the pull rod 3 and the center hole 81a / 81b, a linear bearing (not shown in the figure) is arranged in the center hole 81a / 81b, which is arranged in the interior of the telescopic sleeve 9, and the pull rod 3 is movably inserted in the linear bearing.

[0038] Four mounting holes 82a / 82b are arranged on the fixing plate 8a / 8b, and the four mounting holes 82a / 82b are arranged around the center hole 81a / 82b. The mounting holes 82a / 82b are arranged in one-to-one correspondence with the connecting rods 5, and the connecting rods 5 are inserted in the mounting holes 82a / 82b. The connecting rod 5 is provided with a snap ring (not shown in the figure), and the fixing plate 8a / 8b is supported on the snap ring. By adjusting the position of the snap ring on the connecting rod 5, the position of the fixing plate 8a / 8b on the connecting rod 5 is adjusted.

[0039] In Figure 5 , the hole wall of the mounting hole 82a is in a closed structure, specifically, the mounting hole 82a is in a circular hole or a polygonal structure, and the embodiment is preferably circular. The cross-sectional shape of the mounting hole 82a matches the cross-sectional shape of the connecting rod 5.

[0040] In Figure 6 , the hole wall of the mounting hole 82b is provided with an opening, and the opening is arranged away from the center of the fixing plate 8b, that is, the mounting hole 82b is in a half-hole structure with an outward opening.

[0041] In combination with Figure 3 and Figure 7 , the blanking cylinder 4 comprises a connecting seat 43 and a sleeve portion 44 in communication with the upper and lower ends, and the upper portion of the sleeve portion 44 is fixedly connected with the connecting seat 43. The feeding port 41 is arranged on the connecting seat 43, and the feeding port 41 is provided with an arc surface 411 arranged on the inner wall of the upper portion of the feeding port 41. The arc surface extends along the circumference of the feeding port 41. When the feeding port 41 is closed, the arc surface 411 is in line contact with the first sealing member 6.

[0042] The existing constant volume discharger is provided with a slope in the feed inlet 41 for sealing connection with the first sealing piece 6, the slope is in surface contact with the sealing surface on the first sealing piece 6, if the slope or the sealing surface is locally worn, it is easy to cause the problem of sealing failure. Compared with the existing slope, the arc surface 411 of the embodiment only needs to be in linear contact with the sealing surface of the first sealing piece 6 to realize the sealing effect, even if local wear occurs, the sealing effect can be ensured.

[0043] As can be seen from the above, the present application can prevent the pull rod 3 from deviating to the four directions, which is conducive to ensuring that the center of the pull rod 3 and the first sealing piece 6 coincides with the center of the feed inlet 41, avoiding local wear between the contact surface of the first sealing piece 6 and the feed inlet 41, avoiding the gap between the first sealing piece 6 and the feed inlet 41 in the closed state of the feed inlet 41, effectively sealing the feed inlet 41, and improving the accuracy of quantitative feeding.

[0044] Finally, it needs to be emphasized that the above is only the preferred embodiment of the present application, and is not used to limit the present application, for those skilled in the art, the present application can have various changes and modifications, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A constant-volume discharger, comprising a lifting driving device, a fixed base, a pull rod, a discharging cylinder and a plurality of connecting rods, the connecting rods being connected between the fixed base and the discharging cylinder, the lifting driving device being arranged on the fixed base, a first end of the pull rod being connected with the lifting driving device, a second end of the pull rod being provided with a first sealing member and a second sealing member, the first sealing member and the second sealing member being arranged correspondingly with a feeding port and a discharging port of the discharging cylinder respectively, characterized in that: further comprising a fixed plate and two telescopic sleeves, the fixed plate being arranged between the fixed base and the discharging cylinder, a central hole being formed in a middle portion of the fixed plate, the pull rod being movably inserted into the central hole, the two telescopic sleeves being sleeved on the pull rod, and the two telescopic sleeves being arranged on upper and lower sides of the fixed plate respectively, one end of each telescopic sleeve being sealingly connected with the pull rod, the other end of each telescopic sleeve being sealingly connected with the fixed plate, and the telescopic sleeves being covered outside the central hole.

2. The constant-volume discharger according to claim 1, characterized in that: one end of each telescopic sleeve is fixedly connected with the pull rod, and the other end of each telescopic sleeve is fixedly connected with the fixed plate, and each telescopic sleeve can be moved up and down.

3. The constant-volume discharger according to claim 2, characterized in that: one end of each telescopic sleeve is connected with the pull rod through a first annular fixing member, and the other end of each telescopic sleeve is connected with the fixed plate through a second annular fixing member, and the first annular fixing member and the second annular fixing member each extend along a circumference of the telescopic sleeve.

4. The constant-volume discharger according to any one of claims 1 to 3, characterized in that: a linear bearing is arranged in the central hole, and the pull rod is inserted into the linear bearing.

5. The constant-volume discharger according to any one of claims 1 to 3, characterized in that: a distance from the fixed plate to the discharging cylinder is less than or equal to a distance from the fixed plate to the fixed base.

6. The constant-volume discharger according to claim 5, characterized in that: the fixed plate is further provided with a plurality of mounting holes, the mounting holes being arranged correspondingly with the connecting rods, and the connecting rods being inserted into the mounting holes.

7. The constant-volume discharger according to claim 6, characterized in that: a hole wall of each mounting hole is provided in a closed structure.

8. The constant-volume discharger according to claim 6, characterized in that: the hole wall of each mounting hole is provided with an opening, and the opening is arranged away from a center of the fixed plate.

9. The constant-volume discharger according to any one of claims 1 to 3, characterized in that: an upper portion of the discharging cylinder is provided with a connecting seat, the feeding port is arranged on the connecting seat, an arc surface is arranged in the feeding port, the arc surface is arranged on an upper inner wall of the feeding port, and the arc surface is in linear contact with the first sealing member. ​ ​ ​ ​ ​ ​ ​ ​ ​

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