JP2024048616A - Lid attachment/detachment tool - Google Patents

Abstract

A lid member attachment/detachment jig capable of improving safety and work efficiency is provided.
[Solution] An attachment/detachment jig 50 for a cover member 60 that covers a vertical surface attached horizontally to high-pressure resistant equipment 1, comprising at least a main body portion 53 having an upper arm portion 51 and a lower arm portion 52 formed to sandwich an upper end 61 and a lower end 62 of the cover member 60, an upper end fixing portion 54 that fixes the upper arm portion 51 of the main body portion 53 to the upper end 61 of the cover member 60 and is height adjustable, a lower end fixing portion 55 that fixes the lower arm portion 52 of the main body portion 53 to the lower end 62 of the cover member 60 and is height adjustable, and a handle 56 provided on the upper portion of the main body portion 53 for carrying or hanging the attachment/detachment jig 50.
[Selected figure] Figure 3

Description

The present invention relates to a jig for attaching and detaching a lid member, and more specifically, to a jig for attaching and detaching a lid member used to attach and detach a cone valve cover of a diaphragm pump in the wet smelting of nickel oxide ore.

In recent years, the high pressure acid leaching (HPAL) method using sulfuric acid has been attracting attention as a hydrometallurgical method for nickel oxide ore. This method does not include dry processing steps such as drying and roasting, and instead consists of a continuous wet process, so it is advantageous in terms of energy and cost, and has the advantage of being able to obtain nickel-cobalt mixed sulfide with nickel content improved to about 50 mass%.

In HPAL plants that use low-grade nickel ore, low-grade nickel oxide ore is mixed to achieve a specified nickel and impurity grade, and then mixed with water to form a slurry, which is then sieved, and only the ore that passes through the sieve is used. The slurried ore is then fed to an autoclave, where the nickel in the ore is leached out in a sulfuric acid solution at high temperature and pressure. Residual free acid in the leachate slurry is neutralized with limestone in a preliminary neutralization process, and then sent to a solid-liquid separation process. The leach residue separated in the solid-liquid separation process has heavy metals removed to a specified concentration in a final neutralization process, and then sent to a storage dam called a tailings dam.

A high-pressure diaphragm pump is used to pump liquid to the storage dam (tailings dam). The internal parts of this high-pressure diaphragm pump are consumables and must be replaced periodically. In addition, each part is made of iron or steel, and so has a large mass to give it strength, as it is a high-pressure pump.

The high-pressure diaphragm pump is provided with a cone valve (check valve). For example, Patent Document 1 describes that by forming the first cylindrical portion including the valve seat of the cone valve from a flexible material, even if solid particles contained in the slurry get caught between the valve body and the valve seat, the valve seat made of a flexible material deforms, bringing the valve body and the valve seat into close contact with each other, thereby suppressing delays in closing the check valve, suppressing the occurrence of peak oil pressures that cause the oil pressure in the hydraulic chamber of the diaphragm pump to become abnormally high, and suppressing damage to the diaphragm.

The cone valve of the high-pressure diaphragm pump is provided with a cone valve cover (lid member) for internal inspection and repair. This cone valve cover is heavy at approximately 30 kg, and is attached to the cone valve body with four bolts in the horizontal direction so as not to interfere with the reciprocating motion of the valve disc. After removing this cone valve cover, the internal parts of the cone valve can be inspected, replaced, or repaired, but when removing the cover, it is necessary to lift it slightly with two people so as not to get caught on the bolts, and then remove it by pulling it straight to the side along the bolts.

The weight of the cone valve cover (covering member) can be supported by hand or placed on the bolt when it is on top of the bolt, but once it is completely removed from the bolt, it must continue to be supported by hand and there is a risk of it falling off. Situations where the danger is relatively high include when only one side of the cone valve cover is on the bolt just before it is completely removed from the bolt and it falls, or when the cone valve cover is removed and lowered, the weight is concentrated on the fingers of one person carrying it, creating the risk of hands and feet getting pinched. The same is true when a dolly or the like is prepared below the cover, as it requires lifting by hand, and there is also the problem that the work must be done carefully, resulting in poor work efficiency.

JP 2018-197509 A

The present invention was made to solve this problem, and aims to provide a tool for attaching and detaching a lid member that can improve safety and work efficiency.

One aspect of the present invention is a lid member attachment/detachment jig for covering a vertical surface attached horizontally to high-pressure equipment, and includes at least a main body having an upper arm and a lower arm formed to sandwich the upper and lower ends of the lid member, an upper end fixing part that fixes the space between the upper arm of the main body and the upper end of the lid member and is height adjustable, a lower end fixing part that fixes the space between the lower arm of the main body and the lower end of the lid member and is height adjustable, and a handle provided on the top of the main body for carrying or hanging the attachment/detachment jig.

According to one aspect of the present invention, the lid member is fixed between the upper and lower arms of the attachment/detachment tool and moved via a handle, eliminating the need for the worker to directly hold and carry the heavy lid member as in the past, thereby improving safety and work efficiency.

In this case, one aspect of the present invention may be that the mass of the lid member to be attached and detached is 10 kg or more.

In one aspect of the present invention, this can be preferably applied to attaching and detaching heavy lid members that are difficult for workers to carry directly.

In one aspect of the present invention, the upper end fixing portion and/or the lower end fixing portion may be a screwed bolt.

This allows the upper and lower arms of the attachment/detachment jig to be easily and securely fixed to the lid member while adjusting the height, with a simple configuration.

In one aspect of the present invention, multiple upper end fixing parts and/or multiple lower end fixing parts may be provided.

By fixing it at multiple points, the upper and lower arms of the attachment/detachment jig can be fixed more firmly to the lid member, which reliably prevents the lid member from falling off during attachment/detachment.

In one aspect of the present invention, the cone valve cover of a high-pressure diaphragm pump used in a hydrometallurgical method for nickel oxide ore can be the object to be attached and detached.

Even if the cone valve cover has a large mass of approximately 30 kg, the detachable member according to one aspect of the present invention can be preferably applied.

In this way, the present invention makes it possible to provide a tool for attaching and detaching a lid member that can improve safety and work efficiency.

FIG. 1 is a process diagram showing a hydrometallurgical process for nickel oxide ore by high-pressure acid leaching. FIG. 1 is a vertical sectional view for explaining an overview of a diaphragm pump. FIG. 2 is a perspective view showing a lid member attachment/detachment jig according to an embodiment of the present invention. FIG. 11 is a perspective view showing a cover member attachment/detachment jig according to another embodiment of the present invention. 1A to 1C are schematic diagrams showing a process of removing a cone valve cover using a lid member attachment/detachment jig according to one embodiment of the present invention.

The lid member mounting/removal jig according to the present invention will be described below with reference to the drawings in the following order. Note that the present invention is not limited to the following examples, and can be modified as desired without departing from the gist of the present invention.
1. Nickel oxide ore hydrometallurgy method 2. Diaphragm pump 3. Lid attachment/detachment tool

<1. Hydrometallurgical method for nickel oxide ore>
First, before describing the cover member attachment/detachment jig in more detail, a nickel oxide ore hydrometallurgical method to which the attachment/detachment jig according to the present invention is applied will be briefly described. The cover member attachment/detachment jig according to one embodiment of the present invention is intended to attach and detach a cone valve cover of a high-pressure diaphragm pump used mainly in the nickel oxide ore hydrometallurgical method as described later, but is not necessarily limited to this case. For example, it can be applied to attach and detach a cover member or the like that covers a vertical surface attached from a horizontal direction to a high-pressure equipment that requires a certain level of strength. The nickel oxide ore hydrometallurgical method is a hydrometallurgical method in which nickel and cobalt are leached from nickel oxide ore and recovered by using, for example, a high-pressure acid leaching method (HPAL method). FIG. 1 shows an example of a process diagram of a nickel oxide ore hydrometallurgical method using a high-pressure acid leaching method.

In the slurry preparation process S1, nickel oxide ore is used as the raw material ore. Several types of nickel oxide ore are mixed to achieve a specified Ni grade and impurity grade, which are then mixed with water to form a slurry, which is then sieved to classify at a specified classification point to remove oversized ore particles, after which only the undersized ore is used.

In the leaching step S2, the nickel oxide ore slurry obtained in the slurry preparation step S1 is subjected to a leaching process, for example, using a high-pressure acid leaching method. Specifically, sulfuric acid is added to the ore slurry obtained by mixing the raw nickel oxide ore, and nickel, cobalt, etc. are leached from the ore by pressurizing it under high temperature conditions of 220 to 280°C using, for example, a heat-resistant and pressure-resistant container (autoclave), and a leaching slurry consisting of a leachate and leach residue is formed.

In the leaching step S2, excess sulfuric acid is added to improve the leaching rate. Therefore, the resulting leaching slurry contains excess sulfuric acid that was not involved in the leaching reaction, and its pH is very low.

For this reason, in the preliminary neutralization step S3, the pH of the leaching slurry obtained in the leaching step S2 is increased and adjusted to a predetermined range so that efficient washing can be performed during the multi-stage washing in the next solid-liquid separation step S4. The pH can be adjusted to a predetermined range by adding a neutralizing agent such as limestone (calcium carbonate) slurry, for example.

In the solid-liquid separation step S4, the leaching slurry whose pH has been adjusted in the preliminary neutralization step S3 is washed in multiple stages to obtain a leaching solution and leaching residue that contain nickel, cobalt, and zinc as an impurity element.

In the neutralization step S5, the pH of the leachate separated in the solid-liquid separation step S4 is adjusted, and the neutralized precipitate containing impurity elements is separated to obtain a neutralized end solution containing zinc as well as nickel and cobalt. The pH of the leachate is adjusted by adding a neutralizing agent such as limestone (calcium carbonate) slurry.

In the dezincification step S6, a sulfurization treatment is performed by adding a sulfurizing agent such as hydrogen sulfide gas to the neutralization end liquid obtained in the neutralization step S5 to generate zinc sulfide, which is then separated and removed to obtain a mother liquor for nickel recovery (dezincification end liquid) containing nickel and cobalt.

Then, in the sulfurization step S7, hydrogen sulfide gas as a sulfurizing agent is blown into the dezincification end liquor, which is the mother liquor for recovering nickel after the dezincification step S6, to cause a sulfurization reaction, producing a mixed sulfide of nickel and cobalt with few impurities and a barren liquor in which the concentrations of nickel and cobalt are stabilized at low levels.

The final neutralization step S8 neutralizes the leaching residue containing free sulfuric acid transferred from the solid-liquid separation step S4 described above, and the filtrate (poor liquid) containing impurities such as magnesium, aluminum, and iron transferred from the sulfidation step S7. The leaching residue and filtrate are adjusted to a predetermined pH range using a neutralizing agent, and become a waste slurry (tailings). The generated tailings are transferred to a tailings dam (waste storage area).

2. Diaphragm Pump
So far, the flow of the hydrometallurgical method for nickel oxide ore has been explained. The diaphragm pump is used in the leaching step S2 to transfer the slurry to the autoclave and in the final neutralization step S8 to send the waste slurry to the tailings dam. Therefore, the lid member attachment/detachment jig according to one embodiment of the present invention is used in these situations to attach and detach the lid member (cone valve cover) having a large mass when repairing or inspecting the cone valve provided in the diaphragm pump. Here, the configuration of the diaphragm pump will be briefly explained.

Figure 2 is a vertical cross-sectional view for explaining the outline of a diaphragm pump. As shown in Figure 2, the diaphragm pump 1 comprises a pump body 10, and a pump cover 20 is fastened to the front surface (left side in Figure 2) of the pump body 10. The outer peripheral edge of a diaphragm 30, which is a disc-shaped flexible membrane, is fastened between the pump body 10 and the pump cover 20.

The pump body 10 has a hydraulic chamber 11 filled with hydraulic oil. The hydraulic chamber 11 consists of a diaphragm operating chamber 11a, a piston operating chamber 11b, and a flow path 11c connecting the two operating chambers 11a and 11b. The pump cover 20 has a suction chamber 21 formed inside, into which the slurry, which is the fluid to be transported, is sucked in and pumped out. The hydraulic chamber 11 (diaphragm operating chamber 11a) and the suction chamber 21 are separated by a diaphragm 30.

The diaphragm 30 is sandwiched at its center between a pair of disks 31 and 32. A guide rod 33 is connected to the disk 32 on the hydraulic chamber 11 side, and the guide rod 33 passes through an axial hole 34, allowing it to slide in the front-to-back direction of the diaphragm 30 (left-to-right direction in Figure 2).

A piston 40 is provided inside the pump body 10. The piston 40 consists of a cylindrical piston head 41 and a piston rod 42 connected to the piston head 41. The piston head 41 is inserted into a cylindrical cylinder portion 12 that constitutes part of the side wall of the piston working chamber 11b, and is able to slide along the axial direction of the cylinder portion 12. The side surface of the piston head 41 and the inner wall of the cylinder portion 12 are liquid-tightly sealed.

The piston 40 reciprocates when driven by a drive unit (not shown). For example, the drive unit may consist of an electric motor, a crankshaft that rotates when driven by the electric motor, and a connecting rod connected to the crankshaft. The connecting rod is connected to the piston rod 42.

The reciprocating movement of the piston 40 causes the hydraulic pressure in the hydraulic chamber 11 to rise and fall. More specifically, when the piston 40 moves forward (to the left in FIG. 2), the piston head 41 moves toward the inside of the hydraulic chamber 11, and the hydraulic pressure in the hydraulic chamber 11 rises. Conversely, when the piston 40 moves backward (to the right in FIG. 2), the piston head 41 moves toward the outside of the hydraulic chamber 11, and the hydraulic pressure in the hydraulic chamber 11 falls.

The diaphragm 30 reciprocates as the hydraulic pressure in the hydraulic chamber 11 rises and falls. More specifically, when the hydraulic pressure in the hydraulic chamber 11 rises, the diaphragm 30 moves forward (towards the suction chamber 21). Conversely, when the hydraulic pressure in the hydraulic chamber 11 falls, the diaphragm 30 moves backward (towards the hydraulic chamber 11). In this way, the reciprocating motion of the piston 40 causes the diaphragm 30 to reciprocate.

The suction side of the suction chamber 21 is connected to the secondary side of the suction side check valve (suction side cone valve) 2 via a suction flow path 22. A suction port member 23 having a suction port is connected to the primary side of the suction side check valve (suction side cone valve) 2. The suction side check valve (suction side cone valve) 2 allows the flow of fluid from the suction port toward the suction chamber 21 and prevents the flow in the opposite direction.

The discharge side of the suction chamber 21 is connected to the primary side of the discharge side check valve (discharge side cone valve) 3 via a discharge flow path 24. The secondary side of the discharge side check valve (discharge side cone valve) 3 is connected to a discharge port member 25 having a discharge port. The discharge side check valve (discharge side cone valve) 3 allows the flow of fluid from the suction chamber 21 toward the discharge port and prevents the flow in the opposite direction.

When the diaphragm 30 moves back, the volume of the suction chamber 21 increases, and the fluid to be transferred is sucked into the suction chamber 21 from the suction port. At this time, the suction side check valve (suction side cone valve) 2 opens to allow the flow of fluid. Meanwhile, the discharge side check valve (discharge side cone valve) 3 is closed.

When the diaphragm 30 moves forward, the volume of the suction chamber 21 decreases, and the fluid in the suction chamber 21 is discharged from the discharge port. At this time, the discharge side check valve 3 opens to allow the fluid to flow. Meanwhile, the suction side check valve 2 is closed.

In this way, the volume of the suction chamber 21 increases and decreases as the diaphragm 30 reciprocates, causing the fluid to be transported to be sucked into the suction chamber 21 and then pumped out. As a result, the fluid to be transported is transported from the suction port (primary side) of the diaphragm pump 1 to the discharge port (secondary side).

<3. Lid member attachment/detachment jig>
As described above and shown in FIG. 2, the diaphragm pump is provided with cone valves (check valves) on the suction side and discharge side. As an example, the cone valve cover is attached near the suction side cone valve of the diaphragm pump device so as to cover the vertical surface of the device from the horizontal direction with respect to the diaphragm pump device. The cone valve cover is installed to replace or maintain parts inside the cone valve (for example, a valve body and a valve seat that are easily worn by slurry), and is, as an example, made of metal with a side of several tens of centimeters, has a mass of about 30 kg, and is fixed to the cone valve body by four bolts at the corners. The attachment and detachment jig of the cover member according to the present invention is a jig for safely and efficiently attaching and detaching such a cone valve cover.

Figure 3 is a perspective view showing a lid member attachment/detachment jig according to one embodiment of the present invention. One aspect of the present invention is a lid member 60 attachment/detachment jig 50 for covering a vertical surface attached horizontally to high-pressure equipment 1, and includes at least a main body 53 having an upper arm 51 and a lower arm 52 formed to sandwich the upper end 61 and the lower end 62 of the lid member 60, an upper end fixing part 54 that fixes the upper arm 51 of the main body 53 to the upper end 61 of the lid member 60 and is height adjustable, a lower end fixing part 55 that fixes the lower arm 52 of the main body 53 to the lower end 62 of the lid member 60 and is height adjustable, and a handle 56 provided on the upper part of the main body 53 for carrying or hanging the attachment/detachment jig 50.

As described above, the attachment/detachment jig 50 according to one aspect of the present invention is used primarily for attaching and detaching heavy lid members. A heavy lid member has a mass of, for example, 10 kg or more. One of the objects of the present invention is to safely and efficiently attach and detach heavy lid members that are difficult for workers to carry directly, and therefore the present invention is primarily intended for heavy lid members, but it can also be used to attach and detach lighter lid members.

The materials of the components constituting the lid member attachment/detachment jig 50 according to one embodiment of the present invention are not particularly limited, but as an example, structural steel can be used. For example, as shown in FIG. 3, upper arm 51 and lower arm 52 can be formed by welding channel steel to the upper and lower side surfaces of a plate-shaped or box-shaped member. In this way, commonly used components can be used at low cost, and holes for passing screws and bolts can be easily drilled. The mass of the attachment/detachment jig processed in this way is about 5 kg.

The main body 53 has an upper arm 51 and a lower arm 52 formed to sandwich the upper end 61 and the lower end 62 of the lid member 60. As shown in FIG. 5 described later, the attachment/detachment jig 50 according to one embodiment of the present invention is inserted so as to sandwich the lid member 60 from above and below, so that the distance between the upper arm 51 and the lower arm 52 of the attachment/detachment jig 50 needs to be wider than the length from the upper end 61 to the lower end 62 of the lid member 60. In addition, the main body 53 may have a mechanism that allows the length of the upper arm 51 and the lower arm 52 in the arm direction and the distance between the upper arm 51 and the lower arm 52 to be adjusted.

The upper end fixing part 54 fixes the upper arm part 51 of the main body part 53 and the upper end 61 of the lid member 60 while adjusting the height, and the lower end fixing part 55 fixes the lower arm part 52 of the main body part 53 and the lower end 62 of the lid member 60 while adjusting the height. For example, a screwed bolt can be used as the upper end fixing part 54 and/or the lower end fixing part 55. If it is a screwed bolt, it can be easily installed by providing a screw hole in the upper arm part 51 and/or the lower arm part 52 and passing a bolt and a nut through it, and the attachment/detachment jig 50 and the lid member 60 can be fixed while adjusting the height by turning the bolt or nut. Alternatively, it may be configured to be biased by a spring, or may be configured to be fixed while adjusting the height by a jack mechanism. A cushioning material, an anti-slip material, etc. may be appropriately provided at the end of the upper end fixing part 54 and/or the lower end fixing part 55.

In one aspect of the present invention, the upper end fixing portion 54 and/or the lower end fixing portion 55 may be provided in a plurality of positions. By fixing at a plurality of positions, the upper arm portion 51 and the lower arm portion 52 of the attachment/detachment jig 50 and the lid member 60 can be more firmly fixed, so that the lid member 60 can be reliably prevented from falling off when the attachment/detachment jig is attached or detached.

The handle 56 is provided on the upper part of the main body 53 for carrying or hanging the attachment/detachment jig 50. For example, an eye bolt is used as the handle 56. The eye bolt can also be easily installed by providing a screw hole in the main body 53 of the attachment/detachment jig 50. Furthermore, by providing the handle 56 on the main body 53 of the attachment/detachment jig 50, for example, by hanging the hook of a simple crane on the handle 56, the attachment/detachment jig 50 can be easily moved.

In the attachment/detachment jig 50 according to one aspect of the present invention, in addition to the handle 56 provided on the upper part of the main body 53, a handle for manual transport by an operator may be provided on the upper part or side of the main body 53. For example, as shown in FIG. 4, a notch 57 may be provided on the upper arm 51 to serve as a handle. In this way, an operator can carry the attachment/detachment jig 50 by holding the notch 57, thereby reducing the load on the operator's hand. The notch 57 may be provided with a cushioning material or the like. In addition, the lower part of the main body 53 may be provided with wheels for transporting the attachment/detachment jig 50. The attachment/detachment jig 50 may be configured to have a larger bottom area than the cover member 60.

Next, a method for attaching and detaching the cone valve cover 60 (lid member) provided on the diaphragm pump 1 (high-pressure equipment) using an attachment/detachment jig 50 according to one embodiment of the present invention will be described. Figures 5(A) to (C) are schematic diagrams showing the process of removing the cone valve cover using a lid member attachment/detachment jig according to one embodiment of the present invention.

As described above, the cone valve cover 60 is attached to the diaphragm pump 1 so as to cover the vertical surface of the diaphragm pump device (particularly the main body of the cone valve) from the horizontal direction (see Figure 5 (A)).

When removing the cone valve cover 60 from the diaphragm pump 1, first, insert the attachment/detachment jig 50 according to one embodiment of the present invention so that the cone valve cover 60 is positioned between the upper arm 51 and the lower arm 52 (FIG. 5(A)). When moving the attachment/detachment jig 50, the worker may push it in while holding the handle 56 or the like, or may push it in while adjusting the height using a jack, dolly, or the like.

Next, the upper end fixing part 54 of the attachment/detachment jig 50 is fixed to the upper end 61 of the cone valve cover 60, and the lower end fixing part 55 is fixed to the lower end 62 of the cone valve cover 60 (FIG. 5B). If the upper end fixing part 54 and/or the lower end fixing part 55 are bolts screwed together, the height of the bolt part can be adjusted by turning the bolt or nut part, so the height is adjusted until the end of the bolt part abuts the cone valve cover 60. In the abutting state, the bolt is tightened, and the attachment/detachment jig 50 is firmly fixed so that the cone valve cover 60 does not shift when it is moved.

After that, as an example, a hanging tool 70 (hook) such as a simple crane is hung on the handle 56 provided on the attachment/detachment jig 50, the fixing brackets (bolts at the four corners) that fixed the cone valve cover 60 to the diaphragm pump 1 are removed, and the cone valve cover 60 is removed from the diaphragm pump 1 by moving the attachment/detachment jig 50 together with the hanging tool 70 while lifting the cone valve cover 60 with the hanging tool 70 (FIG. 5(C)). In this way, the cone valve cover 60 can be safely and efficiently removed from the diaphragm pump 1 without multiple workers having to bend down to lift it. The hanging tool 70 may be attached at the stage when the attachment/detachment jig 50 in FIG. 5(A) is inserted into the cone valve cover 60.

When the inspection is completed and the cone valve cover 60 is to be attached to the diaphragm pump 1, the above procedure can be reversed and followed as shown in Figures 5(C), (B), and (A). In other words, with the cone valve cover 60 fixed to the attachment/detachment jig 50, it is moved to the attachment/detachment portion of the diaphragm pump 1 where the cone valve cover 60 is attached and detached by the hanging tool 70, and the cone valve cover 60 is fixed to the diaphragm pump 1 by the fixing brackets (bolts at the four corners), after which the upper end fixing portion 54 and the lower end fixing portion 55 of the attachment/detachment jig 50 are loosened, and the cone valve cover 60 is removed from the attachment/detachment jig 50.

As described above, the present invention provides a tool for attaching and detaching a lid member that can improve safety and work efficiency.

The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

The effects of a conventional method for attaching and detaching a cone valve cover (Comparative Example) and the method for removing a cone valve cover using a cover member attachment/detachment tool according to one embodiment of the present invention (Example) were compared. Note that, conventionally, when removing a cone valve cover, two people would call out to each other and lift the cone valve cover slightly so that it would not get caught on the bolts, and then slowly pull it out.

The following effects were confirmed by using the lid member attachment/detachment jig according to one embodiment of the present invention.
(1) When pulling out the cover, the handle can be used to pull it upwards to support the weight, preventing it from suddenly falling, making it safe to remove.
(2) Since it is now easier to pull out than before, the work time has been reduced by approximately one hour.
(3) A work process that previously required two people to remove the part can now be done by one person.

The above demonstrates that safety and work efficiency can be improved by applying the lid member attachment/detachment jig according to one aspect of the present invention.

Although one embodiment of the present invention and each example have been described in detail above, it will be readily apparent to those skilled in the art that many modifications are possible that do not substantially deviate from the novel features and effects of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention.

For example, a term that is described at least once in the specification or drawings together with a different term that has a broader or similar meaning may be replaced with that different term anywhere in the specification or drawings. Furthermore, the configuration of the attachment/detachment jig for the lid member is not limited to that described in the embodiment and examples of the present invention, and various modifications are possible.

1 Diaphragm pump (high pressure equipment), 2 Suction side check valve (suction side cone valve), 3 Discharge side check valve (discharge side cone valve), 10 Pump body, 11 Hydraulic chamber, 12 Cylinder section, 20 Pump cover, 21 Suction chamber, 22 Suction flow path, 23 Suction port member, 24 Discharge flow path, 25 Discharge port member, 30 Diaphragm, 31, 32 Disk, 33 Guide rod, 34 Shaft hole, 40 Piston, 41 Piston head, 42 Piston rod, 50 Attachment jig, 51 Upper arm section, 52 Lower arm section, 53 Main body section, 54 Upper end fixing section, 55 Lower end fixing section, 56 Handle, 57 Notch (handle), 60 Cone valve cover (lid member), 61 Upper end of lid member, 62 Lower end of lid member, 70 Lifting tool

Claims (5)

A lid member for covering a vertical surface attached horizontally to a high-pressure equipment is attached to the lid member by a detachment jig.
at least,
a main body portion having an upper arm portion and a lower arm portion formed so as to sandwich an upper end and a lower end of the cover member;
an upper end fixing part that fixes the upper arm part of the main body and the upper end of the cover member and is height adjustable;
a lower end fixing part that fixes the lower arm part of the main body and the lower end of the cover member and is height adjustable;
A lid member attachment/detachment jig comprising a handle provided on an upper portion of the main body for carrying or suspending the attachment/detachment jig. The lid member attachment/detachment jig according to claim 1, characterized in that the mass of the lid member to be attached/detached is 10 kg or more. The lid member attachment/detachment jig according to claim 1, characterized in that the upper end fixing part and/or the lower end fixing part are threaded bolts. The lid member attachment/detachment jig according to claim 3, characterized in that it has a plurality of the upper end fixing parts and/or the lower end fixing parts. The lid member attachment/detachment jig according to any one of claims 1 to 4, characterized in that the attachment/detachment target is a cone valve cover of a high-pressure diaphragm pump used in a hydrometallurgical method for nickel oxide ore.