A purely mechanical constant pressure hot melt adhesive pump and a single air source adhesive transport method

Abstract

The present invention relates to the technical field of hot melt adhesive pumps, and discloses a purely mechanical constant-pressure hot melt adhesive pump and a single-gas-source adhesive transportation method, comprising a cylinder, a pump body, a reversing valve and a connecting plate, wherein a first adhesive bin and a second adhesive bin are provided inside the pump body, and the first adhesive bin and the second adhesive bin are interconnected via an upper adhesive transportation channel, the first adhesive bin is provided with an adhesive inlet, and the second adhesive bin is provided with an adhesive outlet; the cylinder is movably connected to a pump rod, the pump rod extends into the interior of the first adhesive bin and the pump rod is slidingly connected to the first adhesive bin; the reversing valve is connected to the cylinder, and the reversing valve is connected to a reversing rod; the present invention has the following advantages: 1. Only a single compressed air source is required to simultaneously realize reversing control and cylinder pumping operations, no electricity is required, and costs are saved; 2. Structural design is utilized to combine reversing control and cylinder pumping with a single air source, and the structure is simpler and easier to control; 3. The adhesive transportation method of the present invention has a simple process, stable transportation, and high efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of hot melt adhesive pumps, and in particular to a purely mechanical constant pressure hot melt adhesive pump and a single air source adhesive transportation method. Background Art

[0002] Hot melt adhesive is a plastic adhesive that is solid at room temperature. Within a certain temperature range, its physical state can gradually change to fluid as the temperature rises. When the temperature drops, its physical state can return to solid again. During this process, its chemical properties remain unchanged. It is non-toxic and odorless. It is an environmentally friendly chemical adhesive and is widely used in industrial production.

[0003] In industrial production, after hot melt adhesive is melted into liquid adhesive, a hot melt adhesive pump is typically used to transport the liquid adhesive and spray it out at a certain adhesive pressure for production use. Existing hot melt adhesive pumps typically use servo motors to drive the adhesive, and utilize control components such as return valves and pressure sensors to control the pump's unidirectional adhesive flow. However, such hot melt adhesive pumps require a large amount of electrical equipment, resulting in complex equipment structures, high production costs, and high electricity consumption. Furthermore, the hot melt adhesive pump's output adhesive pressure remains unstable and uncontrollable, resulting in poor adhesive spraying results, unstable equipment performance, and an inability to meet production needs. In light of this, the inventors have made improvements. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and provide a purely mechanical constant-pressure hot melt adhesive pump and a single-gas-source adhesive transport method, which have the characteristics of low cost, stable performance, and good adhesive spraying effect.

[0005] To achieve the above-mentioned object, the present invention is a purely mechanical constant-pressure hot melt adhesive pump, comprising a cylinder, a pump body, a reversing valve and a connecting plate, wherein a first glue tank and a second glue tank are provided inside the pump body, and the first glue tank and the second glue tank are connected to each other through a glue transport channel at the upper part, the first glue tank is provided with a glue inlet, and the second glue tank is provided with a glue outlet; the cylinder is movably connected to a pump rod, the pump rod extends into the interior of the first glue tank and is slidably connected to the first glue tank; the reversing valve is connected to the cylinder, and the reversing valve is connected to the reversing rod; a magnet a is provided on the connecting plate, one end of the connecting plate is fixedly connected to the pump rod, and the other end of the connecting plate is movably sleeved on the reversing rod, and magnets b and magnet c are respectively provided at the upper and lower ends of the reversing rod, the magnet a attracts the magnets b and c respectively to drive the reversing valve to change the direction of the airflow, and the reversing valve drives the pump rod to move up and down, and also includes a one-way valve mechanism, and the pump rod transports the colloid from the first glue tank to the second glue tank through the one-way valve mechanism.

[0006] Furthermore, the one-way valve mechanism includes an upper valve mechanism and a lower valve mechanism that cooperate with each other. The upper valve mechanism is arranged at the end of the pump rod, the lower valve mechanism is arranged at the lower part of the first glue bin, and the lower valve mechanism is arranged above the glue inlet.

[0007] Furthermore, a first accommodating chamber with an opening is provided at the end of the pump rod, and a first through hole communicating with the glue transport channel is provided on the side of the first accommodating chamber; the upper valve mechanism includes a spring a, a steel ball a and a first mounting seat, the spring a and the steel ball a are sequentially accommodated in the first accommodating chamber, the first mounting seat is arranged at the opening end of the first accommodating chamber, a second through hole is provided in the middle of the first mounting seat, the steel ball a can be movably arranged on the top of the first mounting seat, the first mounting seat limits the steel ball a, and the steel ball a can seal the second through hole.

[0008] Furthermore, the lower valve mechanism includes a spring b, a steel ball b and a second mounting seat, a second accommodating chamber is opened inside the second mounting seat, a first opening is provided at the upper end of the second accommodating chamber, and a second opening is provided at the lower end of the second accommodating chamber. The spring b and steel ball b are sequentially accommodated in the second accommodating chamber, and the spring b can drive the steel ball b to seal the second opening.

[0009] Preferably, a cylinder body is further sleeved inside the first glue bin, the pump rod is slidably connected to the cylinder body, the bottom end of the cylinder body and the first glue bin form a third accommodating chamber, the glue inlet is arranged on the side of the third accommodating chamber, and the lower valve mechanism is arranged at the end of the cylinder body.

[0010] Furthermore, a piston is movably connected inside the cylinder, and the top end of the pump rod is fixedly connected to the piston; the upper part of the reversing valve is connected to the cylinder through the first air intake channel, and the lower part of the reversing valve is connected to the cylinder through the second air intake channel, and the piston moves between the first air intake channel and the second air intake channel.

[0011] Furthermore, an air nozzle for connecting to an air source is provided on the outside of the reversing valve, a reversing shaft is movably connected inside the reversing valve, the end of the reversing shaft is fixedly connected to the reversing rod, a first sealing plug for sealing the first air inlet channel is provided on the upper part of the reversing shaft, and a second sealing plug for sealing the second air inlet channel is provided on the lower part of the reversing shaft.

[0012] The present invention also provides a single-gas-source adhesive transport method for a purely mechanical constant-pressure hot melt adhesive pump, comprising the following steps:

[0013] Step 1: Glue feeding step: gas enters the reversing valve and enters the cylinder from the second air inlet channel of the reversing valve to drive the piston upward. The upper valve mechanism closes and the lower valve mechanism opens to draw the colloid into the cylinder.

[0014] Step 2: First reversing step: The piston moves upward. When the connecting plate approaches the top of the reversing rod, magnet a attracts magnet b. Under the action of the magnetic force, magnet b drives the reversing shaft to move rapidly, sealing the second air intake channel and opening the first air intake channel, thus achieving the first reversing.

[0015] Step 3: Glue transport step: gas enters the reversing valve and enters the cylinder from the first air inlet channel of the reversing valve to drive the piston downward. The upper valve mechanism opens and the lower valve mechanism closes. The colloid passes through the upper valve mechanism and the glue transport channel into the second glue bin.

[0016] Step 4: Glue discharging step, the colloid is ejected from the glue outlet;

[0017] Step 5, the second reversing step, the piston moves downward, when the connecting plate approaches the lower end of the reversing rod, magnet a attracts magnet c, under the action of magnetic force, magnet c drives the reversing shaft to move rapidly, so that the first air intake channel is sealed and the second air intake channel is open, realizing the second reversing.

[0018] Furthermore, a first pressure relief step is included between step 2 and step 3: the reversing shaft moves downward and simultaneously drives the fourth sealing plug to move downward to open the second pressure relief hole, and the gas under the piston flows back to the reversing valve through the second air intake channel and is discharged through the second pressure relief hole and the second muffler.

[0019] Furthermore, it also includes a second pressure relief step: after the reversing valve is reversed for the second time, the reversing shaft moves upward and at the same time drives the third sealing plug to move upward to open the first pressure relief hole, and the gas above the piston flows back to the reversing valve through the first air intake channel and is discharged through the first pressure relief hole and the first muffler.

[0020] Beneficial effects: Compared with the prior art, the present invention is a purely mechanical constant-pressure hot melt adhesive pump and a single-gas-source adhesive transportation method, comprising an air cylinder, a pump body, a reversing valve and a connecting plate. A first adhesive bin and a second adhesive bin are provided inside the pump body, and the first adhesive bin and the second adhesive bin are interconnected through an upper adhesive transportation channel. The first adhesive bin is provided with an adhesive inlet, and the second adhesive bin is provided with an adhesive outlet. The present invention has the following advantages: 1. Only a single compressed air source is required to simultaneously realize reversing control and cylinder pumping operations, without the need for electrical energy, thus saving costs; 2. The structural design allows a single air source to be combined with reversing control and cylinder pumping, resulting in a simpler structure and easier control; 3. After the reversing control and cylinder pumping are combined to realize circulation control, a stable adhesive spraying output can be obtained, resulting in better use effects. 4. No power supply is required, making it safer; 5. The adhesive transportation method of the present invention is simple in process, stable in transportation, and highly efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0022] Figure 2This is a structural schematic diagram from another perspective of the present invention.

[0023] Figure 3 It is a schematic diagram of the internal structure of the present invention.

[0024] Figure 4 It is a schematic diagram of the side cross-section structure of the reversing valve of the present invention.

[0025] Figure 5 It is a schematic structural diagram of the upper valve mechanism of the present invention.

[0026] Figure 6 It is a schematic structural diagram of the lower valve mechanism of the present invention.

[0027] Reference numerals include:

[0028] Cylinder--1, piston--11, first air intake channel--12, second air intake channel--13, pump rod--2, first accommodating chamber--21, first through hole--22, connecting plate--3, magnet a--31, reversing rod--4, magnet b--41, magnet c--42, reversing valve--5, air nozzle--51, reversing shaft--52, first sealing plug--521, second sealing plug--522, third sealing plug--523, fourth sealing plug--524, first pressure relief hole--53, second pressure relief hole--54, first muffler--55, second muffler--56, latch--57 , Pump body--6, First glue silo--61, Glue inlet--611, Second glue silo--62, Glue outlet--621, Glue transport channel--63, One-way valve mechanism--7, Upper valve mechanism--71, Spring a--711, Steel ball a--712, First mounting seat--713, Second through hole--714, Lower valve mechanism--72, Spring b--721, Steel ball b--722, Second mounting seat--723, Second accommodating chamber--724, First opening--725, Second opening--726, Cylinder body--8, Third accommodating chamber--81, Filter screen--9, Support seat--10. DETAILED DESCRIPTION

[0029] The following is combined with Figures 1 to 6 The present invention will be described in detail.

[0030] The present invention is a purely mechanical constant-pressure hot melt adhesive pump, comprising a cylinder 1, a pump body 6, a reversing valve 5 and a connecting plate 3. A first glue tank 61 and a second glue tank 62 are provided inside the pump body 6. The first glue tank 61 and the second glue tank 62 are connected to each other through a glue transport channel 63 at the upper part. The first glue tank 61 is provided with a glue inlet 611, and the second glue tank 62 is provided with a glue outlet 621. When the pump body 6 is in use, the glue is continuously filled into the first glue tank 61 through the glue inlet 611; the cylinder 1 is movably connected to the pump rod 2, the pump rod 2 extends into the first glue tank 61 and the pump rod 2 is slidably connected to the first glue tank 61; the reversing valve 5 is connected to the cylinder 1, and the reversing valve 5 is connected to the reversing rod 4; a magnet a31 is provided on the connecting plate 3, one end of the connecting plate 3 is fixedly connected to the pump rod 2, and the other end of the connecting plate 3 is movably sleeved on the reversing rod 4, and the upper and lower ends of the reversing rod 4 are respectively provided with magnets b41 and magnet c42.

[0031] In this technical solution, the pump rod 2 and the reversing rod 4 cooperate with each other. The up and down movement of the pump rod 2 will drive the magnet a31 to move together. The magnet a31 can attract the magnet b41 and the magnet c42 respectively. Since the reversing rod 4 and the reversing valve 5 are movably connected, when the magnet a31 attracts the magnet b41, the reversing rod 4 will be driven downward by the action of the magnetic force. When the magnet a31 attracts the magnet c42, the reversing rod 4 will be driven upward, thereby changing the airflow direction of the reversing valve 5. The change in the airflow direction will drive the pump rod 2 to reciprocate up and down. Finally, under the action of the one-way valve mechanism 7, the pump rod 2 continuously transports the colloid from the first glue tank 61 to the second glue tank 62, and sprays the colloid from the glue outlet 621 at a constant glue pressure.

[0032] The present invention is a purely mechanical structure. The entire device can be driven by connecting only a single air pipe, without requiring a power source or circuitry. This simplifies the device's structure and reduces manufacturing costs. Furthermore, the inventors have improved the connection accuracy between the pump rod 2 and the side wall of the first adhesive reservoir 61 and hardened the parts. This prevents deformation of the pump rod 2 during sliding, allowing the end of the pump rod 2 to slide with the side wall of the first adhesive reservoir 61 without leaking or depressurizing. A sealing ring no longer needs to be installed at the end of the pump rod 2, eliminating the problem of reduced device service life due to wear of the sealing ring. On the other hand, the present device can achieve automatic reversing of the cylinder 1, and the inventor uses the mutual attraction of magnets to drive the reversing valve 5 to automatically change the direction of the airflow. According to the principle that the suction force is proportional to the square of the distance, when magnet a31 respectively attracts magnet b41 and magnet c42, the reversing rod 4 will move up or down in a very short time (within 2ms) to achieve rapid reversal of the reversing valve 5. The faster the reversing speed of the reversing valve 5, the more stable the movement of the pump rod 2 will be, thereby determining that the pump rod 2 can transport the colloid at a stable air pressure and ensure that the colloid is output from the glue outlet 621 at a basically constant glue pressure. That is, the pressure output by the pump rod 2 will be directly proportional to the glue pressure at the glue outlet 621, thereby improving the glue discharge effect and solving the problem of unstable glue discharge and poor performance of traditional hot melt adhesive pumps. The magnets used in this technical solution are permanent magnets.

[0033] In this technical solution, a support base 10 is further provided between the cylinder 1 and the pump body 6. The cylinder 1 is arranged above the support base 10, and the pump rod 2 extends through the support base 10 into the interior of the pump body 6. The support base 10 supports the cylinder 1, assembling the cylinder 1 and the pump body 6 together in a stacked manner, resulting in a compact structure and reducing the space occupied by the equipment.

[0034] In the present invention, the one-way valve mechanism 7 comprises an upper valve mechanism 71 and a lower valve mechanism 72 that cooperate with each other. The upper valve mechanism 71 is located at the end of the pump rod 2, and the lower valve mechanism 72 is located below the first glue tank 61. The lower valve mechanism 72 is also located above the glue inlet 611. During operation, the lower valve mechanism 72 cooperates with the pump rod 2 to draw the glue into the cylinder 8. Specifically, when the pump rod 2 moves upward, the upper valve mechanism 71 closes, and the lower valve mechanism 72 opens, drawing the glue in using suction pressure. When the pump rod 2 moves downward, the upper valve mechanism 71 opens, transferring the glue from the first glue tank 61 to the second glue tank 62. Simultaneously, the lower valve mechanism 72 closes to prevent the glue from leaking out of the first glue tank 61.

[0035] As an embodiment, a first accommodating chamber 21 with an opening is provided at the end of the pump rod 2, and a first through hole 22 which is interconnected with the glue transport channel 63 is provided on the side of the first accommodating chamber 21; the upper valve mechanism 71 includes a spring a711, a steel ball a712 and a first mounting seat 713, and the spring a711 and the steel ball a712 are sequentially accommodated in the first accommodating chamber 21, and the first mounting seat 713 is provided at the open end of the first accommodating chamber 21, and a second through hole 714 is provided in the middle of the first mounting seat 713, and the steel ball a712 can be movably provided on the top of the first mounting seat 713, and the steel ball a712 can seal the second through hole 714.

[0036] The working principle of the upper valve mechanism 71 is: when the pump rod 2 moves downward, the pressure inside the cylinder body 8 increases, and the lower valve mechanism 72 is closed at this time. Under the action of inertia and pressure difference, the steel ball a712 floats upward, opening the second through hole 714, and the colloid inside the cylinder body 8 enters the first accommodating chamber 21 through the second through hole 714, and finally flows out through the first through hole 22 on the side of the first accommodating chamber 21, and then flows into the second glue bin 62 through the glue transport channel 63.

[0037] As another embodiment, the lower valve mechanism 72 includes a spring b721, a steel ball b722 and a second mounting seat 723, a second accommodating chamber 724 is opened inside the second mounting seat 723, a first opening 725 is provided at the upper end of the second accommodating chamber 724, and a second opening 726 is provided at the lower end of the second accommodating chamber 724, the spring b721 and the steel ball b722 are sequentially accommodated in the second accommodating chamber 724, and the steel ball b722 can seal the second opening 726.

[0038] The working principle of the lower valve mechanism 72 is: when the pump rod 2 moves upward to draw a vacuum, the vacuum degree inside the cylinder 8 increases. At this time, the upper valve mechanism 71 is closed. Under the action of the pressure difference, the steel ball b722 will float upward to open the second opening 726, and the colloid stored in the third accommodating chamber 81 will be drawn into the interior of the cylinder 8.

[0039] To further improve the technical solution, a cylinder 8 is further sleeved inside the first glue bin 61. The pump rod 2 is slidably connected to the cylinder 8. The lower valve mechanism 72 is disposed at the end of the cylinder 8. The bottom end of the cylinder 8 and the first glue bin 61 form a third accommodating chamber 81. The glue inlet 611 is disposed on the side of the third accommodating chamber 81. During use, the glue is first filled into the third accommodating chamber 81 through the glue inlet 611 for storage. Only when the lower valve mechanism 72 is opened is the glue drawn into the cylinder 8. The purpose of providing the cylinder 8 is to: 1. facilitate the installation of the lower valve mechanism; 2. form a third accommodating chamber at the bottom of the first glue bin, providing space for one-way transportation of the glue; 3. create a sealed environment between the top of the first glue bin and the pump rod, making it easier for the steel ball b to float upward when the pump rod moves upward to draw a vacuum.

[0040] Furthermore, a piston 11 is movably connected to the interior of the cylinder 1, and the top end of the pump rod 2 is fixedly connected to the piston 11. The upper portion of the reversing valve 5 is connected to the cylinder 1 via a first air inlet channel 12, and the lower portion of the reversing valve 5 is connected to the cylinder 1 via a second air inlet channel 13. The piston 11 is disposed between the first air inlet channel 12 and the second air inlet channel 13. When gas flows into the cylinder 1 through the first air inlet channel 12, the piston 11 is driven to move downward along the wall of the cylinder 1, driving the pump rod 2 downward. When the piston 11 approaches the second air inlet channel 13, the reversing valve 5 automatically reverses direction using the action of a magnet, and gas flows into the cylinder 1 through the second air inlet channel 13, driving the piston 11 to move upward along the wall of the cylinder 1, driving the pump rod 2 upward, and driving the pump rod 2 to reciprocate up and down.

[0041] In this technical solution, the reversing valve 5 is externally provided with a gas nozzle 51 for connecting to an air source. During use, an external air source is connected to the gas nozzle 51, and air is injected from the center of the reversing valve 5. Inside the reversing valve 5, a reversing shaft 52 is movably connected. The distal end of the reversing shaft 52 is fixedly connected to the reversing rod 4. A first sealing plug 521 is provided on the upper portion of the reversing shaft 52, which seals the first air inlet passage 12. A second sealing plug 522 is provided on the lower portion of the reversing shaft 52, which seals the second air inlet passage 13. Furthermore, a latch 57 is provided inside the reversing valve 5 to cooperate with the sealing plug. When magnet a31 moves to the top of the reversing rod 4, magnet a31 and magnet b41 attract each other. Under the action of the magnetic force, magnet b41 quickly moves downward, pulling the reversing shaft 52 downward quickly. The second sealing plug 522 follows and is engaged in the locking position 57 below the second sealing plug 522. The second air inlet channel 13 is sealed, and the first sealing plug 521 is released from the upper locking position 57. The first air inlet channel 12 is opened, and the gas is diverted from the first air inlet channel 12 to flow into the cylinder 1, driving the piston 11 downward. Similarly, when magnet a31 moves to the bottom of the reversing rod 4, magnet a31 attracts magnet c42, and the reversing shaft 52 moves upward. The first air inlet channel 12 is sealed, and the second air inlet channel 13 is opened.

[0042] Preferably, a plurality of first pressure relief holes 53 are provided on the upper part of the reversing valve 5, which can be communicated with the first air inlet channel 12. The first pressure relief holes 53 are provided above the first sealing plug 521. Figure 4As shown, the reversing shaft 52 is further provided with a third sealing plug 523 above the first sealing plug 521. When the first sealing plug 521 seals the first air inlet passage 12, the third sealing plug 523 moves upward to open the first pressure relief hole 53, allowing the gas that pushes the piston 11 downward to discharge the reversing valve 5 through the first pressure relief hole 53, thereby discharging excess gas and avoiding affecting the normal operation of the pump body 6. Similarly, the reversing valve 5 is provided with a plurality of second pressure relief holes 54 at the lower portion thereof that can communicate with the second air inlet passage 13. The second pressure relief holes 54 are provided below the second sealing plug 522. The reversing shaft 52 is further provided with a fourth sealing plug 524 above the second sealing plug 522. When the second sealing plug 522 seals the second air inlet passage 13, the fourth sealing plug 524 moves downward to open the second pressure relief holes 54, allowing the gas that pushes the piston 11 upward to discharge the reversing valve 5 through the second pressure relief holes 54.

[0043] As can be seen from the above, the reversing scheme of the cylinder 1 of the present invention has an ingenious structure and high flexibility, the inflow and discharge of gas inside the cylinder 1 do not affect each other, and the stability is good.

[0044] To further improve the technical solution, the first pressure relief hole 53 and the second pressure relief hole 54 are respectively connected to the outside of a first muffler 55 and a second muffler 56. After the gas is processed by the first muffler 55 and the second muffler 56, noise pollution can be effectively reduced.

[0045] like Figure 3 As shown, a filter screen 9 is installed inside the second glue silo 62. After the colloid enters the second glue silo 62, it is first filtered through the filter screen 9 for impurities before being ejected from the glue outlet 621 at a certain pressure. The filter screen 9 is used to filter impurities from the colloid, preventing them from clogging the glue outlet 621 and affecting the operation of the pump body 6, while also improving the quality of the glue output.

[0046] The present invention also provides a single-gas-source adhesive transport method for a purely mechanical constant-pressure hot melt adhesive pump, comprising the following steps:

[0047] Step 1: Glue feeding step: gas enters the reversing valve and enters the cylinder from the second air inlet channel of the reversing valve to drive the piston upward. The upper valve mechanism closes and the lower valve mechanism opens to draw the colloid into the cylinder.

[0048] Step 2: First reversing step: The piston moves upward. When the connecting plate approaches the top of the reversing rod, magnet a attracts magnet b. Under the action of the magnetic force, magnet b drives the reversing shaft to move rapidly, sealing the second air intake channel and opening the first air intake channel, thus achieving the first reversing.

[0049] Step 3: Glue transport step: gas enters the reversing valve and enters the cylinder from the first air inlet channel of the reversing valve to drive the piston downward. The upper valve mechanism opens and the lower valve mechanism closes. The colloid passes through the upper valve mechanism and the glue transport channel into the second glue bin.

[0050] Step 4: Glue discharging step, the colloid is ejected from the glue outlet;

[0051] Step 5, the second reversing step, the piston moves downward, when the connecting plate approaches the lower end of the reversing rod, magnet a attracts magnet c, under the action of magnetic force, magnet c drives the reversing shaft to move rapidly, so that the first air intake channel is sealed and the second air intake channel is open, realizing the second reversing.

[0052] In this technical solution, a first pressure relief step is also included between step 2 and step 3: the reversing shaft moves downward and simultaneously drives the fourth sealing plug to move downward to open the second pressure relief hole, and the gas under the piston flows back to the reversing valve through the second air intake channel and is discharged through the second pressure relief hole and the second muffler.

[0053] At the same time, it also includes a second pressure relief step: after the reversing valve is reversed for the second time, the reversing shaft moves upward and drives the third sealing plug to move upward to open the first pressure relief hole. The gas above the piston flows back to the reversing valve through the first air intake channel and is discharged through the first pressure relief hole and the first muffler.

[0054] The above steps constitute a single complete glue transporting process. By repeating the above steps, the glue can be continuously transported from the first glue silo to the second glue silo and ejected from the glue outlet for production use.

[0055] The glue transportation method of the present invention controls the one-way transportation of the colloid through a one-way valve, and the colloid will not flow back. Under the action of the magnet, the cylinder can automatically and quickly reverse. The colloid transportation process has high stability and high transportation efficiency, and can ensure that the colloid is sprayed out at a constant glue pressure, significantly improving the glue spraying effect of the pump body.

[0056] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A purely mechanical constant pressure hot melt adhesive pump, comprising a cylinder (1), a pump body (6), a reversing valve (5) and a connecting plate (3), characterized in that: The pump body (6) is provided with a first glue bin (61) and a second glue bin (62), the first glue bin (61) and the second glue bin (62) are connected to each other through an upper glue transport channel (63), the first glue bin (61) is provided with a glue inlet (611), and the second glue bin (62) is provided with a glue outlet (621); the cylinder (1) is movably connected to a pump rod (2), the pump rod (2) extends into the first glue bin (61) and the pump rod (2) is slidably connected to the first glue bin (61); the reversing valve (5) is connected to the cylinder (1), and the reversing valve (5) is connected to the reversing rod (4); the connection A magnet a (31) is provided on the plate (3), one end of the connecting plate (3) is fixedly connected to the pump rod (2), and the other end of the connecting plate (3) is movably connected to the reversing rod (4), and the upper and lower ends of the reversing rod (4) are respectively provided with a magnet b (41) and a magnet c (42), and the magnet a (31) and the magnet b (41) and the magnet c (42) respectively attract each other to drive the reversing valve (5) to change the direction of the airflow, and the reversing valve (5) drives the pump rod (2) to move up and down, and also includes a one-way valve mechanism (7), and the pump rod (2) transports the colloid from the first colloid bin (61) to the second colloid bin (62) through the one-way valve mechanism (7); The one-way valve mechanism (7) comprises an upper valve mechanism (71) and a lower valve mechanism (72) that cooperate with each other, wherein the upper valve mechanism (71) is arranged at the end of the pump rod (2), and the lower valve mechanism (72) is arranged at the lower part of the first glue bin (61), and the lower valve mechanism (72) is arranged above the glue inlet (611); The end of the pump rod (2) is provided with a first accommodating chamber (21) having an opening, and a first through hole (22) is provided on the side of the first accommodating chamber (21) and is communicated with the glue transport channel (63); the upper valve mechanism (71) comprises a spring a (711), a steel ball a (712) and a first mounting seat (713), the spring a (711) and the steel ball a (712) being sequentially accommodated in the first accommodating chamber (21), the first mounting seat (713) being provided at the open end of the first accommodating chamber (21), a second through hole (714) being provided in the middle of the first mounting seat (713), the steel ball a (712) being movably provided on the top of the first mounting seat (713), the first mounting seat (713) restricting the steel ball a (712), and the steel ball a (712) being able to seal the second through hole (714); The lower valve mechanism (72) includes a spring b (721), a steel ball b (722) and a second mounting seat (723); a second accommodating chamber (724) is provided inside the second mounting seat (723); a first opening (725) is provided at the upper end of the second accommodating chamber (724); and a second opening (726) is provided at the lower end of the second accommodating chamber (724); the spring b (721) and the steel ball b (722) are sequentially accommodated in the second accommodating chamber (724), and the spring b (721) can drive the steel ball b (722) to seal the second opening (726); The reversing valve (5) is provided with an air nozzle (51) for connecting to an air source on the outside, and a reversing shaft (52) is movably connected to the inside of the reversing valve (5). The end of the reversing shaft (52) is fixedly connected to the reversing rod (4). The upper part of the reversing shaft (52) is provided with a first sealing plug (521) for sealing the first air inlet channel (12), and the lower part of the reversing shaft (52) is provided with a second sealing plug (522) for sealing the second air inlet channel (13).

2. A purely mechanical constant pressure hot melt adhesive pump according to claim 1, characterized in that: The first glue tank (61) is also sleeved with a cylinder body (8), the pump rod (2) is slidably connected to the cylinder body (8), the bottom end of the cylinder body (8) and the first glue tank (61) form a third accommodating chamber (81), the glue inlet (611) is arranged on the side of the third accommodating chamber (81), and the lower valve mechanism (72) is arranged at the end of the cylinder body (8).

3. A purely mechanical constant pressure hot melt adhesive pump according to claim 1, characterized in that: The cylinder (1) is movably connected to a piston (11), and the top end of the pump rod (2) is fixedly connected to the piston (11); the upper portion of the reversing valve (5) is connected to the cylinder (1) through a first air inlet passage (12), and the lower portion of the reversing valve (5) is connected to the cylinder (1) through a second air inlet passage (13); and the piston (11) moves between the first air inlet passage (12) and the second air inlet passage (13).

4. A method for transporting adhesive using a single air source using a purely mechanical constant pressure hot melt adhesive pump, comprising the hot melt adhesive pump according to any one of claims 1 to 3, characterized in that: The steps include: Step 1: Glue feeding step: gas enters the reversing valve and enters the cylinder from the second air inlet channel of the reversing valve to drive the piston upward. The upper valve mechanism closes and the lower valve mechanism opens to draw the colloid into the cylinder. Step 2: First reversing step: The piston moves upward. When the connecting plate approaches the top of the reversing rod, magnet a attracts magnet b. Under the action of the magnetic force, magnet b drives the reversing shaft to move rapidly, sealing the second air intake channel and opening the first air intake channel, thus achieving the first reversing. Step 3: Glue transport step: gas enters the reversing valve and enters the cylinder from the first air inlet channel of the reversing valve to drive the piston downward. The upper valve mechanism opens and the lower valve mechanism closes. The colloid passes through the upper valve mechanism and the glue transport channel into the second glue bin. Step 4: Glue discharging step, the colloid is ejected from the glue outlet; Step 5, the second reversing step, the piston moves downward, when the connecting plate approaches the lower end of the reversing rod, magnet a attracts magnet c, under the action of magnetic force, magnet c drives the reversing shaft to move rapidly, so that the first air intake channel is sealed and the second air intake channel is open, realizing the second reversing.

5. The single-gas-source adhesive transport method of a purely mechanical constant-pressure hot melt adhesive pump according to claim 4, characterized in that: A first pressure relief step is also included between step 2 and step 3: the reversing shaft moves downward and simultaneously drives the fourth sealing plug to move downward to open the second pressure relief hole, and the gas under the piston flows back to the reversing valve through the second air intake channel and is discharged through the second pressure relief hole and the second muffler.

6. A single-gas-source adhesive transport method for a purely mechanical constant-pressure hot melt adhesive pump according to any one of claims 4 to 5, characterized in that: It also includes a second pressure relief step: after the reversing valve is reversed for the second time, the reversing shaft moves upward and at the same time drives the third sealing plug to move upward to open the first pressure relief hole, and the gas above the piston flows back to the reversing valve through the first air intake channel and is discharged through the first pressure relief hole and the first muffler.

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