A hollow fiber curtain membrane automatic glue injection device and glue injection method

Abstract

The present invention discloses an automatic glue injection device and method for a hollow fiber curtain membrane, comprising a machine body, a plurality of glue injection metering pumps are arranged in the machine body, a glue inlet of the glue injection metering pump is provided with a glue inlet pipe connected to the inside of a potting glue storage tank, a glue outlet of the glue injection metering pump is provided with a glue outlet pipe, a flow divider is arranged at the end of the glue outlet pipe, each outlet of the flow divider is respectively connected to a glue outlet branch pipe, and a glue gun is connected to the end of the glue outlet branch pipe; at least one horizontal guide rod is arranged at the front end of the machine body, a slide groove is arranged along the length direction of the horizontal guide rod on the lower end face, and the glue guns are arranged in the slide grooves respectively, and the glue guns are translated to the position to be injected along the slide grooves under the drive of a driving mechanism. The present invention can realize an automated glue injection process and has good application and promotion value. In addition to being able to realize an automated glue injection process, it is also equipped with corresponding tooling, which can be used to simultaneously inject glue to both ends of the membrane wire. Compared with the traditional glue injection process, the glue injection cycle can be effectively shortened and the production efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of membrane element manufacturing, and in particular to an automatic glue injection device and a glue injection method for a hollow fiber curtain type membrane. Background Art

[0002] Membrane Bio-Reactor (MBR) is a new water treatment technology that combines a membrane separation unit with a biological treatment unit. Compared with traditional biological treatment processes, it has obvious advantages such as high effluent quality, less residual sludge and small footprint. At present, the MBR membrane assembly with the widest application range and good operating effect on the market is the hollow fiber curtain membrane assembly. The existing curtain membrane assembly manufacturing process generally has multiple glue injection and potting processes: first, one end of the membrane wire is hung up, and the other end is arranged into a sheet with a plywood for the first potting, and then the plywood is cut to allow the membrane wire channel to leak out; then the cut plywood is bonded to the water collection membrane box (glue must be applied to the inner wall of the water collection membrane box in advance); then the second potting is performed, hard glue is injected, and soft glue is injected after the hard glue cools (hard and soft glue are mostly polyurethane or epoxy system glue). It can be seen that the conventional manufacturing process has cumbersome steps, and multiple glue potting and cutting are not only time-consuming and labor-intensive, but also cause waste of production raw materials.

[0003] In response to the above problems, an improved glue injection process has emerged. The membrane pores are first immersed or blocked by a sealing medium, and then a certain thickness of hard and soft sealing glue is injected above the sealing medium, and finally the sealing medium is discharged. This method optimizes the curtain membrane module packaging process, saves time and cost, but as a relatively new process, the technology is not yet fully mature, and the industry lacks unified standards. Overall, many existing similar glue injection methods have some shortcomings:

[0004] (1) Not simple enough. From the perspectives of time, cost, and sequence, the overall glue injection process and its supporting equipment are not simple enough. The purpose of using sealing media to achieve curtain membrane glue injection is to optimize the process sequence, shorten working hours, and reduce production costs. However, similar glue injection processes invented by many manufacturers have the opposite effect. Although the overall glue injection process steps have been reduced, other steps have been added, and other supporting equipment has been added, which undoubtedly prolongs the working hours and increases the cost burden.

[0005] (2) Improper selection of sealing medium and defects in the corresponding operating process. The role played by the sealing medium in this process is similar to that of "support", and the main body of the support is the potting hard glue. First, the opening of the membrane wire water collection channel is immersed or blocked with the sealing medium, and then the hard glue is injected on top of the sealing medium. Due to the presence of the sealing medium, the hard glue is difficult to contact the opening of the membrane wire water collection channel, thus blocking the channel opening. The sealing medium can be a liquid (it is necessary to ensure that the sealing liquid and the potting glue are immiscible, and the density of the sealing liquid is greater than the density of the potting glue), or a solid (including solids, semi-solids, and colloids, etc.).

[0006] When the sealing medium is liquid, when the potting hard glue is injected into the membrane box and contacts the sealing medium, due to the effect of gravity and the fluidity of the liquid, the interface layer at the contact point between the two is "concave", and then the hard glue slowly spreads, and the boundary layer tends to be flat. However, there is a risk of blocking the outlet of the membrane wire water collection channel during the "concave" process of the potting hard glue, resulting in a reduction in the effective membrane area of ​​the membrane assembly and affecting product performance. Therefore, when using liquid sealing media, a reasonable and careful operation method is required.

[0007] When the sealing medium is solid particles, the sealing performance of the membrane wire channel is poor due to the gaps between the particles. The potting glue tends to flow down along the gaps between the particles, causing the membrane wire channel to be blocked. When the sealing medium is semi-solid such as powder or gel, the sealing effect is good, and there is no risk of blocking the membrane wire channel during injection, but the discharge of the sealing medium is a difficult point.

[0008] The selection of sealing media should not only consider the feasibility of process operation, but also its stability and safety. Some manufacturers use carcinogens and substances that are irritating to various systems of the body in their processes, which are obviously not suitable for use as sealing media.

[0009] (3) Recovery of sealing media. After the sealing media is used to inject glue into the curtain membrane assembly, the sealing media needs to be discharged to expose the membrane wire water collection channel. For liquid sealing media of normal viscosity, it only needs to be poured out or pumped out; high-viscosity liquid sealing media often have the problem of slow recovery and incomplete recovery; for solid or semi-solid sealing media, many manufacturers choose to use water or heat to dissolve, then discharge, and then recycle the sealing media through a set of concentration and purification process systems or hot and cold water circulation systems. This undoubtedly increases costs, processes and working hours. Summary of the invention

[0010] The purpose of the present invention is to provide a hollow fiber curtain membrane automatic glue injection device and glue injection method, which can optimize the process steps, improve production efficiency and reduce production costs under the premise of ensuring the quality of potting.

[0011] To achieve the above object, the technical solution of the present invention is:

[0012] An automatic glue injection device for a hollow fiber curtain membrane comprises a machine body, wherein a plurality of glue injection metering pumps are arranged in the machine body, a glue inlet of the glue injection metering pump is provided with a glue inlet pipe connected to the inside of a potting glue storage tank, a glue outlet of the glue injection metering pump is provided with a glue outlet pipe, a flow divider is arranged at the end of the glue outlet pipe, each outlet of the flow divider is respectively connected with a glue outlet branch pipe, and a glue gun is connected to the end of the glue outlet branch pipe;

[0013] At least one horizontal guide rod is provided at the front end of the machine body, and a slide groove is provided along the length direction of the horizontal guide rod on the lower end surface thereof, and the glue guns are respectively arranged in the slide grooves, and the glue guns are driven by the driving mechanism to translate along the slide grooves to the position to be injected;

[0014] The machine body is provided with a PLC controller, which is respectively connected with the glue injection metering pump, the glue gun and the driving mechanism to control the system.

[0015] As a preferred embodiment of the present invention, a workbench is further provided at the front end of the machine body, on which two membrane boxes are placed in parallel and transversely arranged, and a supporting cross bar parallel to the membrane boxes is provided above the workbench. When the membrane wire is folded in half and placed on the supporting cross bar, both ends fall into the corresponding membrane boxes respectively.

[0016] As a preferred embodiment of the present invention, a fixed beam parallel to the membrane box is provided above the membrane box, a movable beam is provided on the side of the fixed beam, and a fastener for adjusting the gap between the movable beam and the fixed beam is provided between the movable beam and the fixed beam, which is used to fix the two ends of the membrane wire to be injected.

[0017] As a preferred solution of the present invention, the horizontal guide rods are two parallely arranged ones, and when injecting glue, the glue gun injects glue into the membrane box from both sides.

[0018] As a preferred embodiment of the present invention, the driving mechanism includes a screw and a motor for driving the screw to rotate. The glue gun is mounted on the screw through a screw hole. When the motor drives the screw to rotate, it provides lateral movement power to the glue gun.

[0019] To achieve the above object, the present invention also provides a technical solution:

[0020] A hollow fiber curtain membrane glue injection method comprises the following steps:

[0021] Step 1: Use hot melt adhesive to encapsulate the neatly stacked membrane wires at a width of 30-40 mm at a position 40-45 mm near the end holes to form a membrane unit for standby use;

[0022] Step 2, injecting liquid sealing medium into the membrane box;

[0023] Step 3: Fold the membrane unit in half and place it on the supporting crossbar, so that both ends of the membrane unit pass through the gap formed by the movable crossbeam and the fixed crossbeam and then extend into the membrane box, ensuring that the sealing medium covers the port by 10mm;

[0024] Step 4: Turn on the glue injection metering pump and motor, make the glue gun reciprocate at a uniform speed of 5 mm / s, and inject 5-10 mm thick hard glue into the membrane box evenly, then turn off the glue injection metering pump and cure for 2-4 hours;

[0025] Step 5: Continue to inject 40-45mm of hard glue into the membrane box, so that the glue covers the hot melt glue by 10-20mm;

[0026] Step 6: After the glue solidifies, discharge the glycerin through a suction pump.

[0027] As a preferred embodiment of the present invention, the sealing medium in step 2 is specifically glycerol.

[0028] As a preferred solution of this scheme, before the glue injection in step 5, it is also necessary to adjust the fasteners so that the movable crossbeam moves relative to the fixed crossbeam to clamp the membrane unit.

[0029] The beneficial effects of the present invention are:

[0030] 1. The automatic glue injection device of the present invention has a simple structure, low assembly difficulty, is convenient and reliable to use, can realize an automated glue injection process, and has great application and promotion value.

[0031] 2. In addition to being able to realize the automated glue injection process, the automatic glue injection device of the present invention is also equipped with corresponding tooling, which can be used to inject glue at both ends of the membrane wire at the same time. Compared with the traditional glue injection process, it can effectively shorten the glue injection cycle and improve production efficiency.

[0032] 3. The glue injection method of the present invention first uses hot melt glue to encapsulate the membrane wire, replacing the traditional soft glue encapsulation process, and is performed before the glue injection operation. Compared with the process method of encapsulating after glue injection, it is convenient for batch operation, which is beneficial to reducing production costs and improving production efficiency.

[0033] 4. The present invention injects a small amount of glue for the first time, which not only avoids the problem of hard glue sinking and blocking the water collection channel of the membrane wire, but also forms support on the medium surface, laying a foundation for the second injection of glue. During the second injection of glue, the glue surface covers part of the hot melt glue, so that the hard glue wraps part of the hot melt glue. The hard glue improves the potting strength of the curtain membrane and avoids the membrane wire from falling off. The hot melt glue buffers the swing of the membrane wire and protects the root of the membrane wire, thereby increasing the service life of the curtain membrane.

[0034] 5. The present invention uses glycerin with low viscosity as the sealing medium, which can be easily recycled and avoids the problem of clogging the outlet of the membrane wire water collection channel, thereby reducing production costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of an automatic glue injection device for a hollow fiber curtain membrane of the present invention;

[0036] Figure 2 It is a schematic diagram of the assembly of the machine body of the present invention;

[0037] Figure 3 It is a schematic diagram of packaging of the membrane unit of the present invention;

[0038] Figure 4 It is a schematic diagram of the glue injection process of the present invention. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings.

[0040] like Figure 1-2 As shown, an automatic glue injection device for a hollow fiber curtain membrane comprises a body 1, a plurality of glue injection metering pumps 2 are arranged in the body 1, a glue inlet of the glue injection metering pump 2 is provided with a glue inlet pipe 4 connected to the inside of a potting glue storage tank 3, a glue outlet of the glue injection metering pump 2 is provided with a glue outlet pipe 5, a flow divider 6 is provided at the end of the glue outlet pipe 5, each outlet of the flow divider 6 is respectively connected with a glue outlet branch pipe 7, and a glue gun 8 is connected to the end of the glue outlet branch pipe 7;

[0041] At least one horizontal guide rod 9 is provided at the front end of the machine body 1, and a slide groove is provided on the lower end surface of the horizontal guide rod 9 along its length direction, and the glue gun 8 is respectively arranged in the slide groove, and the glue gun 8 is driven by the driving mechanism to translate along the slide groove to the position to be injected; the driving mechanism includes a screw rod 10 and a motor 11 driving the screw rod 10 to rotate, and the glue gun 8 is sleeved on the screw rod 10 through a screw hole, and the motor 11 drives the screw rod 10 to rotate to provide lateral movement power to the glue gun 8;

[0042] The machine body 1 is provided with a PLC controller 19, which is respectively connected to the glue injection metering pump 2, the glue gun 8, and the driving mechanism to perform system control.

[0043] The automatic glue injection device of the present invention has a simple structure, low assembly difficulty, is convenient and reliable to use, can realize an automated glue injection process, and has great application and promotion value.

[0044] The front end of the machine body 1 is also provided with a workbench 12, on which two film boxes 13 are placed in parallel and transversely arranged, and above the workbench 12 is provided a support crossbar 14 parallel to the film boxes 13, and when the film wire 15 is folded in half and placed on the support crossbar 14, both ends fall into the corresponding film boxes 13. In this way, both ends of the film wire 15 can be injected with glue at the same time, which can effectively shorten the injection cycle and improve production efficiency compared with the traditional injection process.

[0045] The film box 13 is provided with a fixed beam 16 parallel to the film box 13 above, a movable beam 17 is provided on the side of the fixed beam 16, and a fastener 18 for adjusting the gap between the movable beam 17 and the fixed beam 16 is provided to fix the two ends of the film wire 15 to be injected. After the film wire is clamped and fixed, it can avoid the influence of external interference on the production quality.

[0046] Clamping plates 20 are also provided on both sides of the membrane box to fix the membrane box to avoid external disturbances that affect production quality.

[0047] The two horizontal guide rods 9 are arranged in parallel. When injecting glue, the glue gun 8 can inject glue into the membrane box 13 from both sides, which can improve the efficiency of glue injection.

[0048] like Figure 1-4 As shown, a method for injecting glue into a hollow fiber curtain membrane based on the above-mentioned automatic injection device comprises the following steps:

[0049] Step 1: Use hot melt adhesive 21 to encapsulate the neatly stacked membrane wires at a width of 30-40 mm at a position 40-45 mm near the end holes to form a membrane unit for standby use;

[0050] Step 2, injecting liquid sealing medium into the membrane box;

[0051] Step 3: Fold the membrane unit in half and place it on the supporting crossbar, so that both ends of the membrane unit pass through the gap formed by the movable crossbeam and the fixed crossbeam and then extend into the membrane box, ensuring that the sealing medium covers the port by 10mm;

[0052] Step 4: Turn on the glue injection metering pump and motor, make the glue gun reciprocate at a uniform speed of 5 mm / s, and inject 5-10 mm thick hard glue into the membrane box evenly, then turn off the glue injection metering pump and cure for 2-4 hours;

[0053] Step 5: Continue to inject 40-45mm of hard glue into the membrane box, so that the glue covers the hot melt glue by 10-20mm;

[0054] Step 6: After the glue solidifies, discharge the glycerin through a suction pump.

[0055] In the step 2, the sealing medium specifically uses glycerin with low viscosity as the sealing medium, which can be easily recycled and avoids the problem of clogging the outlet of the membrane wire water collection channel, thereby reducing production costs and improving production efficiency.

[0056] Before the glue is injected in step 5, the fasteners need to be adjusted so that the movable crossbeam moves relative to the fixed crossbeam to clamp the membrane unit. After the membrane unit is clamped, the influence of external interference on the production quality can be avoided.

[0057] The glue injection method of the present invention first uses hot melt glue to encapsulate the membrane wire, replacing the traditional soft glue encapsulation process, and is performed before the glue injection operation. Compared with the process method of encapsulating after glue injection, it is convenient for batch operation, which is beneficial to reducing production costs and improving production efficiency.

[0058] The present invention injects a small amount of glue for the first time, which not only avoids the problem of hard glue sinking and blocking the water collection channel opening of the membrane wire, but also forms support on the medium surface, laying a foundation for the secondary glue injection. During the second glue injection, the glue surface covers part of the hot melt glue, so that the hard glue wraps part of the hot melt glue. The hard glue improves the potting strength of the curtain membrane and avoids the membrane wire from falling off. The hot melt glue buffers the swing of the membrane wire and protects the root of the membrane wire, thereby increasing the service life of the curtain membrane.

[0059] The described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A hollow fiber curtain membrane glue injection method, suitable for a hollow fiber curtain membrane automatic glue injection device, characterized in that: The automatic glue injection device for hollow fiber curtain membrane comprises a machine body, in which a plurality of glue injection metering pumps are arranged, the glue inlet of the glue injection metering pump is provided with a glue inlet pipe connected to the inside of the potting glue storage tank, the glue outlet of the glue injection metering pump is provided with a glue outlet pipe, the end of the glue outlet pipe is provided with a flow divider, each outlet of the flow divider is respectively connected with a glue outlet branch pipe, and the end of the glue outlet branch pipe is connected with a glue gun; At least one horizontal guide rod is provided at the front end of the machine body, and a slide groove is provided along the length direction of the horizontal guide rod on the lower end surface thereof, and the glue guns are respectively arranged in the slide grooves, and the glue guns are driven by the driving mechanism to translate along the slide grooves to the position to be injected; The machine body is provided with a PLC controller, which is respectively connected to the glue injection metering pump, glue gun, and driving mechanism to control the system; The front end of the machine body is also provided with a workbench, on which two membrane boxes are placed in parallel and transversely arranged, and a supporting crossbar parallel to the membrane boxes is provided above the workbench; The hollow fiber curtain membrane glue injection method comprises the following steps: Step 1: Use hot melt adhesive to encapsulate the neatly stacked membrane wires at a width of 30-40 mm at a position 40-45 mm near the end holes to form a membrane unit for standby use; Step 2, injecting liquid sealing medium into the membrane box; Step 3: Fold the membrane unit in half and place it on the supporting crossbar, so that both ends of the membrane unit pass through the gap formed by the movable crossbeam and the fixed crossbeam and then extend into the membrane box, ensuring that the sealing medium covers the port by 10mm; Step 4: Turn on the glue injection metering pump and motor, make the glue gun reciprocate at a uniform speed of 5 mm / s, and inject 5-10 mm thick hard glue into the membrane box evenly, then turn off the glue injection metering pump and cure for 2-4 hours; Step 5: Continue to inject 40-45mm of hard glue into the membrane box, so that the glue covers the hot melt glue by 10-20mm; Step 6: After the glue is cured, discharge the liquid sealing medium through a suction pump.

2. A hollow fiber curtain membrane glue injection method according to claim 1, characterized in that: A fixed beam parallel to the membrane box is provided above the membrane box, a movable beam is provided on the side of the fixed beam, and a fastener for adjusting the gap between the movable beam and the fixed beam is provided between the movable beam and the fixed beam, which is used to fix the two ends of the membrane wire to be injected.

3. A hollow fiber curtain membrane glue injection method as claimed in claim 1, characterized in that: The horizontal guide rods are two parallel arranged ones. When injecting glue, the glue gun injects glue into the membrane box from both sides.

4. A hollow fiber curtain membrane glue injection method according to claim 1, characterized in that: The driving mechanism comprises a screw rod and a motor for driving the screw rod to rotate. The glue gun is sleeved on the screw rod through a screw hole. When the motor drives the screw rod to rotate, it provides lateral movement power to the glue gun.

5. A hollow fiber curtain membrane glue injection method as claimed in claim 1, characterized in that: The sealing medium in step 2 is specifically glycerol.

6. A hollow fiber curtain membrane glue injection method as claimed in claim 1, characterized in that: Before the glue is injected in step 5, the fasteners need to be adjusted so that the movable crossbeam moves relative to the fixed crossbeam to clamp the membrane unit.

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