Plate pulling device for filter press

Abstract

The present invention discloses a plate pulling device for a filter press, which is applied to the filter press. The filter press includes two bilaterally symmetrical main beams, with a plurality of unloading plate groups disposed between the two main beams. The unloading plate groups include a plurality of filter plates connected side by side and adjacent to each other, with filter plate handles on both sides of the filter plates being movable along the main beams. The plate pulling device includes a transmission chain disposed on the two main beams and running in the direction of filter plate unloading movement, and a driving mechanism disposed on both sides of at least the first filter plate in the unloading plate group or on both sides of its filter plate handle. The driving mechanism includes at least one sprocket engaged with the transmission chain and idling, at least one of the sprockets being provided with a stopper. The present invention has the beneficial effect of improving the unloading efficiency of the filter plates.

Description

Technical Field

[0001] The invention relates to a plate pulling device of a filter press, which is mainly used in the technical field of filter press unloading. Background Art

[0002] The filter press is a mechanical device that uses a special filter medium to apply a certain pressure to the object, causing the liquid to seep out. It is a commonly used solid-liquid separation equipment. In the prior art, a plate pulling trolley is typically used to pull the filter plates after filtration is completed, opening the gaps between adjacent filter plates and allowing the filter cake to fall out. This unloading method has two major problems: first, the plate pulling trolley is a single-purpose operation object. It can only move and unload one filter plate or a group of filter plates per unit time, resulting in a long interval between adjacent unloading. It cannot unload multiple filter plates or multiple groups of filter plates in a short interval or simultaneously unload for a period of time, resulting in serious shortcomings in efficiency. Second, the operating mechanism of the plate pulling trolley is prone to errors. It cooperates with and drives the filter plates to move through two pushers. The pushers and the related structures that perform the pusher movements are relatively complex and cumbersome, and are prone to operating errors. In addition, the plate pulling trolley's steering is achieved by detecting that the motor current exceeds a threshold when movement is blocked and issuing a motor command to reverse the direction to drive the plate pulling trolley. In actual application, the force applied to the plate pulling trolley when driving the filter plates is not stable. Under external factors or objective environmental interference, it is easy to misjudge the direction of rotation, which not only leads to low efficiency but also easily damages or even destroys the plate pulling trolley's motor.

[0003] For example, prior art publication number CN210751459U discloses a plate pulling device for a chamber filter press, comprising a guide rail, a slider slidably connected to the guide rail, and a plate pulling trolley fixed to the slider. A lubrication mechanism is provided at the contact point between the guide rail and the slider, and dust collection mechanisms are fixedly connected to both ends of the slider. Although the patent includes a lubrication device that lubricates the guide rail, reduces friction between the slider and the guide rail, increases its service life, and thus reduces the probability of misjudgment of steering, it still does not solve the problem of the complex structure of the part that cooperates with the filter plate. In addition, the operating object is still single, and the improvement in work efficiency is not significant.

[0004] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion. Although the structure of the matching part between the plate pulling trolley and the filter plate has been simplified and the stability after matching has been enhanced, the problems of low efficiency due to the single working object and easy misjudgment of steering have not been solved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a plate pulling device for a filter press to improve the unloading efficiency of the filter plate.

[0006] The present invention is achieved through the following technical solutions.

[0007] A plate pulling device for a filter press, which is used in a filter press, wherein the filter press includes two main beams that are symmetrical on the left and right, and a plurality of discharge plate groups are arranged between the two main beams. The discharge plate groups include a plurality of filter plates that are connected side by side and adjacent to each other, and filter plate handles that can move on the main beams are provided on both sides of the filter plates. The plate pulling device includes a transmission chain that is arranged on the two main beams and runs along the filter plate unloading movement direction, and a driving mechanism that is arranged on both sides of at least the first filter plate in the discharge plate group or on both sides of its filter plate handle, and the driving mechanism includes at least one sprocket that is meshed with the transmission chain and idling, and at least one of the sprockets is provided with a stopper.

[0008] As a further improvement of the present invention, the driving mechanism includes at least one sprocket engaged on the front side of the transmission chain and at least one sprocket engaged on the back side of the transmission chain.

[0009] As a further improvement of the present invention, the driving mechanism includes at least three sprockets, wherein the number of sprockets engaged on the front side of the transmission chain and the number of sprockets engaged on the back side of the transmission chain differ by no more than one, and the sprockets are staggered along the length direction of the transmission chain.

[0010] As a further improvement of the present invention, the driving mechanism further comprises a mounting base connected to the outer side of the filter plate handle, the mounting base is provided with a mounting shaft corresponding to the sprocket, and the sprocket is slidingly sleeved on the mounting shaft.

[0011] As a further improvement of the present invention, the mounting base and the filter plate handle are integrally structured.

[0012] As a further improvement of the present invention, the stopper is a friction clutch provided on the mounting shaft and capable of acting on the sprocket.

[0013] As a further improvement of the present invention, transmission gears are respectively provided on the front and rear sides of the main beam, the transmission chain is annular and meshes with the two transmission gears for transmission connection, and one of the transmission gears is a driving wheel.

[0014] As a further improvement of the present invention, adjacent driving mechanisms in the discharge plate group are separated by at least one filter plate.

[0015] Beneficial effects of the present invention:

[0016] The present invention realizes the movement of the filter plate by dragging the transmission chain through the idling and stopping of the sprocket. First, the entire unloading process is continuous, and the efficiency is far superior compared to the single operation mode of the plate pulling trolley in the prior art. Secondly, the setting reliability of the unloading operation mechanism is better. After setting the operating speed of the transmission chain and the number of filter plates in the unloading plate group, the working time interval of the stoppers of adjacent driving mechanisms is reasonably set. This mechanism is simpler and less prone to execution errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the objects and advantages of the present invention, wherein:

[0018] Figure 1 Schematic diagram of the structure of the filter press;

[0019] Figure 2 for Figure 1 A partial enlarged schematic diagram of part A;

[0020] Figure 3 It is a side view schematic diagram of the driving mechanism. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and implementation examples.

[0022] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0023] Reference Figure 1-Figure 3 A plate pulling device includes a transmission chain 31 and a driving mechanism. The two main beams 11 of the filter press are both provided with the transmission chain 31. The front and rear sides of the main beams 11 are respectively provided with transmission gears (not shown in the figure). The transmission chain 31 is an endless chain and is connected by the two transmission gears, one of which is a driving wheel connected to the power source.

[0024] A plurality of filter plates 21 arranged side by side are provided between the two main beams 11. The filter plates 21 may be filter plates 21 with integrated feeding and filtering functions, or they may be material mold partitions for feeding and water mold partitions for filtering that are alternately arranged one by one. When the filter press is in operation, the oil cylinder first outputs power to push the compression plate in the direction facing the thrust plate, thereby compressing the filter plates 21 between the two. Then, the slurry is input into the filter plates 21 and water is input for filtering. After completing this process, the compression plate returns to its original position, and finally, the plate pulling device of the present invention is used to drive the filter plates 21 to move successively in the unloading direction to open the gap between them for unloading. Filter plate handles 22 are provided on both sides of the filter plates 21, and the top edges of the two main beams 11 are provided with tracks 111 along their lengths. The filter plate handles 22 can move on the tracks 111 corresponding to the main beams 11.

[0025] A plurality of consecutive filter plates 21 are grouped together as a stripper plate group. Adjacent filter plates 21 in the stripper plate group are interconnected. Furthermore, this connection is a telescopic connection with a limited maximum travel. In one embodiment, a chain 23 is provided connecting adjacent filter plates 21, at least between the filter plate handles 22 located on the same side. In another embodiment, adjacent filter plates 21 are connected by ropes. It should be noted that, regardless of whether the chain or rope connection is used, adjacent stripper plate groups are not connected.

[0026] The driving mechanisms are provided on both sides of the first filter plate or the filter plate handle 22 in the discharge plate group. The driving mechanism includes at least one sprocket 41 that meshes with the transmission chain 31 and idles, and at least one of the sprockets 41 is provided with a stopper 42. The working principle is as follows: During the period when the first filter plate does not enter the mobile discharge, the sprocket 41 remains in the idle state, that is, the sprocket 41 does not drive the first filter plate to move. When its movement is required, the stopper 42 acts on the sprocket 41 to stop its rotation state. Since the sprocket 41 meshes with the transmission chain 31, the transmission chain 31 drives the sprocket 41 and the first filter plate to move along the discharge direction, and the remaining filter plates 21 of the discharge plate group are also successively dragged by the first filter plate.

[0027] Compared with the existing drawbar trolley or other drawbar methods, the drawbar device of the present invention is more efficient.

[0028] First of all, the discharge is continuous. After the last filter plate 21 of the previous discharge plate group is pulled and moved a certain distance, the current discharge plate group can start discharging, and the time interval between the pulling of two adjacent discharge plate groups is denoted as t1. The prior art needs to pull the previous discharge plate group and the current discharge plate group apart for a relatively long distance to complete the discharge, and the time interval from the pulling to the stop of the previous discharge plate group is denoted as t2. Obviously, t1 < t2. It should be noted that when the drawbar trolley completes the discharge work of the previous discharge plate group, its position is the same as that of the previous discharge plate group, and it needs to move to the current discharge plate group before it can perform the discharge work of the current discharge plate group. The time interval for the drawbar trolley to move is denoted as t3, and t3 is slightly less than t2 but not much different. Therefore, the time interval between the pulling of two adjacent discharge plate groups in the prior art is t2 + t3, which is much greater than t1. Considering all N discharge plate groups, the discharge time-consuming of the present invention is much less than that of the prior art. In terms of efficiency, the drawbar method of the present invention has absolute superiority.

[0029] Secondly, the setting reliability of the unloading operation mechanism is better. The transmission chain 31 runs continuously at a constant speed. After setting the running speed, the time interval between the adjacent driving mechanisms can be set according to the number of filter plates 21 in the unloading plate group and the distance required for unloading of adjacent unloading plate groups. This mechanism is simpler in logic and is less prone to execution errors. In the prior art, the unloading operation is set by the reciprocating movement of the plate pulling trolley between two adjacent unloading plate groups. The plate pulling trolley pulls the previous unloading plate group to move for unloading, and when the previous unloading plate group is pulled to the point where it can no longer move (the previous unloading plate group blocks the current unloading plate group from moving forward), the inverter of the plate pulling trolley detects that the motor current exceeds the threshold value. At this time, the motor reverses and drives the plate pulling trolley to turn and move to the current unloading plate group. According to the same steering mechanism, it turns again to perform the unloading work of the current unloading plate group. In comparison, this mechanism is logically more cumbersome. The steering of the plate pulling trolley depends on the feedback of the resistance during movement, and the force condition of the plate pulling trolley during the unloading process is fluctuating and is easily affected by other factors and uncertain conditions occur. For example, the filter plate 21 is stuck during the unloading process, which causes the plate pulling trolley to easily turn in a non-set position. Therefore, the reliability and stability of the operation are prone to problems.

[0030] It is worth noting that in this embodiment, the driving force exerted on the first filter plate when it moves in the unloading direction is completely provided by the stopping force of the stopper 42 on the sprocket 41. In actual application, the first filter plate drags all the filter plates 21 of the unloading plate group to move, which puts a large load on the stopper 42. The stopper 42 and the sprocket 41 are easily damaged, resulting in a shortened service life or failure to work normally. Therefore, a unloading plate group requires multiple filter plates 21 to be set with a driving mechanism. On the one hand, the load of the driving mechanism of the first filter plate can be shared, so that the load of the stopper 42 of each driving mechanism is less than the threshold value for damage. In addition, adjacent driving mechanisms are separated by at least one filter plate 21. Under normal circumstances, 2-3 filter plates 21 can meet the needs. Of course, the specific number of driving mechanisms and the number of adjacent filter plates 21 need to comprehensively consider the total number of filter plates 21 in the unloading plate group and the actual weight of each filter plate 21.

[0031] Furthermore, the driving mechanism includes at least one sprocket 41 meshed with the front of the transmission chain 31 and at least one meshed with the back of the transmission chain 31. Regardless of whether the sprocket 41 is in an idling state or stopped and dragged by the transmission chain 31, it always generates a vertical force on the transmission chain 31. If the sprocket 41 is only provided on one side of the transmission chain 31, the original tensioning requirements of the transmission chain 31 will be very high, otherwise the meshing degree between the sprocket 41 and the transmission chain 31 will not be high. In addition, after the filter press has been running for a long time, the transmission chain 31 is bound to become loose or sag under the unidirectional vertical force, and the meshing of the sprocket 41 and the transmission chain 31 will become unstable or even disengaged. If this happens, the driving mechanism will not be able to realize the function of dragging the discharge plate group. Therefore, sprockets 41 are provided on both sides of the transmission chain 31, that is, sprockets 41 are engaged with the front and back sides of the transmission chain 31 to balance the vertical force acting on the transmission chain 31, and long-term operation has little effect on the meshing state of the sprocket 41 and the transmission chain 31.

[0032] Taking into account the positional relationship of the sprockets 41 and their positional relationship on both sides of the transmission chain 31, which not only affect the meshing stability of the sprockets 41 and the transmission chain 31, but also affect the setting of the driving mechanism, the driving mechanism includes at least three sprockets 41, wherein the difference in the number of sprockets 41 meshing on the front of the transmission chain 31 and the number of sprockets 41 meshing on the back of the transmission chain 31 does not exceed one, that is, it is necessary to balance the number of sprockets 41 on both sides of the transmission chain 31 to ensure the structural stability of the driving mechanism as much as possible; in addition, the sprockets 41 are staggered along the length direction of the transmission chain 31, and the vertical spacing between the sprockets 41 on both sides of the transmission chain 31, or by replacing sprockets 41 of different diameters, can be fine-tuned. The curvature of the part within the range of the structure. When the filter press is performing unloading, the movement speed of the filter plate 21 is relatively slow. Therefore, when the transmission chain 31 is running, the problem of high damping caused by the partial bending of the driving mechanism has little impact. However, this can improve the coupling degree between the transmission chain 31 and the sprocket 41, that is, more teeth of the sprocket 41 are kept in meshing state with the transmission chain 31. On the one hand, when the sprocket 41 is dragged by the transmission chain 31, whether it is the sprocket 41 or the transmission chain 31, the mutual force is shared by more parts of each, which can avoid local damage. On the other hand, in the absence of damage, the sprocket 41 and the transmission chain 31 will not be disengaged or fail to mesh, thereby improving the stability of the operation of the transmission chain 31.

[0033] In summary, in this embodiment, three sprockets 41 are provided for the driving mechanism, two of which are engaged with the front side of the transmission chain 31 and the other is engaged with the back side of the transmission chain 31 , and the three sprockets 41 are arranged in an equilateral triangle.

[0034] Furthermore, the driving mechanism also includes a mounting base 43, which is connected to the outer side of the filter plate handle 22. It is an integrated structure with the filter plate handle 22 and has a T-shaped structure. The mounting base 43 is provided with a mounting shaft 44 corresponding to the sprocket 41, and the sprocket 41 is slidably sleeved on the mounting shaft 44.

[0035] As for the stopper 42, this embodiment preferably configures the stopper 42 on the sprocket 41 on the back of the transmission chain 31, preferably a friction clutch, and specifically an electromagnetic clutch can be selected. The electromagnetic clutch is installed on the installation shaft 44 corresponding to the sprocket 41. In the non-moving state, the electromagnetic clutch and the sprocket 41 are in a separated state. When movement is required, the electromagnetic clutch is started to engage with the sprocket 41, and the sprocket 41 stops rotating.

[0036] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A plate pulling device for a filter press, which is applied to a filter press, wherein the filter press comprises two left-right symmetrical main beams, a plurality of discharge plate groups are arranged between the two main beams, the discharge plate groups comprise a plurality of filter plates connected side by side and adjacent to each other, and filter plate handles are provided on both sides of the filter plates that can move on the main beams, characterized in that: The plate pulling device includes a transmission chain arranged on two main beams and running along the filter plate unloading movement direction, and a driving mechanism arranged on both sides of at least the first filter plate in the unloading plate group or both sides of its filter plate handle, the driving mechanism includes at least one sprocket engaged on the front side of the transmission chain and idling and at least one sprocket engaged on the back side of the transmission chain and idling, wherein at least one sprocket is provided with a stopper; adjacent driving mechanisms in the unloading plate group are separated by at least one filter plate.

2. The plate pulling device of the filter press according to claim 1, characterized in that: The driving mechanism includes at least three sprockets, wherein the number of sprockets engaged on the front side of the transmission chain and the number of sprockets engaged on the back side of the transmission chain differ by no more than one, and the sprockets are staggered along the length direction of the transmission chain.

3. The plate pulling device of the filter press according to claim 2, characterized in that: The driving mechanism further comprises a mounting base connected to the outer side of the filter plate handle, a mounting shaft is provided on the mounting base corresponding to the sprocket, and the sprocket is slidably sleeved on the mounting shaft.

4. The plate pulling device of the filter press according to claim 3, characterized in that: The mounting base is integral with the filter plate handle structure.

5. The plate pulling device of the filter press according to claim 3, characterized in that: The stopper is a friction clutch provided on the mounting shaft and capable of acting on the sprocket.

6. The plate pulling device of the filter press according to claim 1, characterized in that: Transmission gears are respectively provided on the front and rear sides of the main beam. The transmission chain is annular and meshes with the two transmission gears for transmission connection, and one of the transmission gears is a driving wheel.

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