Acrylic plate processing and filling equipment

Abstract

The utility model relates to the technical field of acrylic plate processing equipment, in particular to acrylic plate processing and filling equipment, which comprises a single-screw pump, a spiral runner is arranged between the single-screw pump and a mold filling port, the spiral runner spirals around a central shaft at equal pitch, and a feeding runner is arranged in a transmission shaft driving the spiral runner to rotate. A feeding section is arranged at the upstream of the spiral flow channel, a discharging section is arranged at the downstream of the spiral flow channel, the two ends of the feeding section are coaxially and fixedly connected with the center shaft and the transmission shaft respectively, and a first butt-joint flow channel is formed in the feeding section and communicates with the spiral flow channel and the feeding flow channel; the two ends of the discharging section are coaxially and fixedly connected with the discharging opening and the center shaft correspondingly, and a second butt-joint runner is formed in the discharging section and communicates with the spiral runner and the discharging opening; in the working process, the spiral flow channel converts pressure fluctuation energy into heat energy or kinetic energy to be dispersed under the action of geometric constraint and centrifugal force, formation of a local high-pressure or low-pressure area is reduced, and the influence of pressure fluctuation generated by the single-screw pump on filling is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of acrylic sheet processing equipment, specifically to an acrylic sheet processing and filling equipment. Background Technology

[0002] Existing acrylic sheet processing and filling equipment uses filling pumps (such as single screw pumps, gear pumps, plunger pumps, etc.) primarily to inject raw materials into the mold through the filling port for shaping. Single screw pumps are widely used in acrylic sheet processing and filling equipment due to their core advantages such as wide media adaptability, valveless design, and ultra-long service life. However, the periodic changes in the meshing of the rotor and stator of a single screw pump cause pressure fluctuations. The fluctuation amplitude of a single screw pump is relatively high, ranging from ±0.1 to 0.3 bar (±0.5% to 1.5%@20 bar), which in turn affects the uniformity of the filling. Utility Model Content

[0003] The purpose of this invention is to provide an acrylic sheet processing and injection device that reduces or eliminates pressure fluctuations generated during the operation of a single screw pump by setting a spiral flow channel, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An acrylic sheet processing filling device includes a single screw pump. A spiral flow channel is provided between the single screw pump and the mold filling port. The spiral flow channel is spirally arranged around a central axis with a constant pitch and is fixedly connected to a spiral groove opened on the central axis. The spiral flow channel is driven to rotate by a drive shaft. The drive shaft is hollow to form a feeding channel. The diameter of the feeding channel is smaller than the diameter of the spiral flow channel. The feeding channel is sealed to the single screw pump through a rotary joint. An upstream feeding section is provided and a downstream discharging section is provided in the spiral flow channel. The radii of the feeding section and the discharging section are larger than the maximum rotation radius of the outer wall of the spiral flow channel.

[0006] The central shaft and the drive shaft are coaxially fixedly connected at both ends of the feeding section. A first docking flow channel is opened in the feeding section, and the first docking flow channel smoothly connects the spiral flow channel and the feeding flow channel.

[0007] The discharge section is coaxially fixedly connected to the discharge port and the central shaft at both ends. A second docking flow channel is opened in the discharge section. The second docking flow channel smoothly connects the spiral flow channel and the discharge port. The discharge port is sealed and connected to the mold filling port through a rotary joint.

[0008] Preferably, the pitch of the first and second docking channels is the same as the pitch of the spiral channel.

[0009] Preferably, both the first docking channel and the second docking channel are configured with variable diameter spirals, and the spiral diameter varies linearly along the axial direction.

[0010] Preferably, the diameter of the first docking channel increases linearly from the same as the diameter of the feed channel to the same as the diameter of the spiral channel;

[0011] The diameter of the second docking channel decreases linearly from the same as the diameter of the spiral channel to the same as the diameter of the outlet channel.

[0012] Preferably, the spiral angle of the spiral channel is 45 degrees.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] In this invention, a single screw pump transports raw materials through the feed channel to the first docking channel, and then smoothly transitions into the spiral channel. The spiral channel, through geometric constraints and centrifugal force, converts pressure fluctuation energy into heat or kinetic energy and disperses it, reducing the formation of local high or low pressure zones. The raw materials then enter the second docking channel, which smoothly guides them to the discharge port. The discharge port is connected to the mold's filling port through a rotary joint for filling, greatly reducing the impact of pressure fluctuations generated during the operation of the single screw pump on the filling process.

[0015] On the other hand, by setting up the first and second docking channels, the raw materials transported in the spiral channel are smoothly transferred to the feed channel and discharge port coaxial with the central axis, and then sealed by the rotary joint, which reduces the difficulty of rotary sealing. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of this utility model;

[0017] Figure 2 Schematic diagram of the spiral flow channel and spiral groove of this utility model;

[0018] Figure 3 Schematic diagram of the flow channel of this utility model.

[0019] In the diagram: 1. Spiral flow channel; 2. Central shaft; 3. Spiral groove; 4. Motor; 5. Drive shaft; 6. Feed channel; 7. Feed section; 8. Discharge section; 9. First docking channel; 10. Second docking channel; 11. Discharge port; 12. Support plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model provides a technical solution:

[0022] refer to Figure 1 and Figure 2 An acrylic sheet processing filling device includes a single screw pump. A spiral flow channel 1 is provided between the single screw pump and the mold filling port. The spiral flow channel 1 is spirally arranged around a central shaft 2 with a constant pitch and is fixedly connected to a spiral groove 3 opened on the central shaft 2. The spiral flow channel 1 is driven to rotate by a drive shaft 5. The drive shaft 5 is hollow to form a feed flow channel 6. The feed flow channel 6 is sealed to the single screw pump through a rotary joint. The diameter of the feed flow channel 6 is smaller than the diameter of the spiral flow channel 1, so that after the raw material enters the spiral flow channel 1, the centrifugal force generated by the rotation moves the raw material tightly against the outer wall. A partial cavity is formed in the central area. The existence of the cavity can buffer pressure fluctuations. Specifically, the drive shaft 5 is fitted with a gear, and the gear is connected to the motor 4 through a gear set.

[0023] The constant pitch design of the spiral channel 1 avoids sudden changes in flow velocity caused by abrupt pitch changes, improving the uniformity of flow velocity distribution. When the spiral channel 1 rotates, the raw material flows closely against the outer wall under the action of centrifugal force, forming a thin-layer flow mode. The normal component of the centrifugal force compresses the raw material layer, reduces internal eddies and lateral flow, forces the raw material to advance axially along the spiral path, significantly reduces the Reynolds number, and promotes laminar flow. Under laminar flow, turbulent pulsation is suppressed, and the pressure fluctuation amplitude can be significantly reduced. On the other hand, the raw material flows closely against the outer wall under the action of centrifugal force, and a partial cavity is formed in the central region. The existence of the cavity can buffer pressure fluctuations.

[0024] The spiral channel 1 has an upstream feed section 7 and a downstream discharge section 8. The radii of the feed section 7 and the discharge section 8 are greater than the maximum rotation radius of the outer wall of the spiral channel 1. In other words, if the feed section 7 and the discharge section 8 are extended, they can completely enclose the spiral channel 1.

[0025] refer to Figure 1 and Figure 3 The two ends of the feeding section 7 are coaxially fixedly connected to the central shaft 2 and the transmission shaft 5, respectively. A first docking channel 9 is opened in the feeding section 7, and the first docking channel 9 smoothly connects the spiral channel 1 and the feeding channel 6.

[0026] The discharge section 8 is coaxially fixedly connected to the discharge port 11 and the central shaft 2 at both ends. A second docking channel 10 is opened in the discharge section 8. The second docking channel 10 smoothly connects the spiral channel 1 and the discharge port 11. The discharge port 11 is sealed and connected to the mold filling port through a rotary joint.

[0027] The pitch of the first docking channel 9 and the second docking channel 10 is the same as the pitch of the spiral channel 1. The function of the first docking channel 9 and the second docking channel 10 is to provide a smooth connection.

[0028] Both the first docking channel 9 and the second docking channel 10 are configured with variable diameter spirals, and their spiral diameters change linearly along the axial direction. That is, the spiral diameter of the first docking channel 9 increases linearly from 0 at the connection with the feed channel 6 to the same spiral diameter as the spiral channel 1, and the spiral diameter of the second docking channel 10 decreases linearly from the connection with the spiral channel 1 to 0 at the connection with the discharge port 11.

[0029] The diameter of the first docking channel 9 increases linearly from the same as the diameter of the feed channel 6 to the same as the diameter of the spiral channel 1;

[0030] The diameter of the second docking channel 10 decreases linearly from the same as the diameter of the spiral channel 1 to the same as the diameter of the outlet 11.

[0031] The tapering structure of discharge section 8 gradually increases the flow velocity by reducing the cross-sectional area, using the increased kinetic energy to offset the pressure drop; while the expanding structure of feed section 7 reduces the flow velocity by increasing the cross-sectional area, restoring pressure energy. This design smooths the pressure gradient and reduces the formation of local high-pressure or low-pressure zones.

[0032] The linear variation design of the flow channel diameter can reduce flow resistance and avoid kinetic energy loss caused by abrupt changes in cross-section. The main function of the first connecting flow channel 9 is to smoothly guide the raw material into the spiral flow channel 1 through a conical spiral. While ensuring smooth guidance of the raw material into the spiral flow channel 1, the length of the first connecting flow channel 9 is shortened as much as possible to reduce kinetic energy loss. The second flow channel is designed to reduce the fluctuations in the smooth guidance from the spiral flow channel 1 to the outlet 11 through the second connecting flow channel 10. The length of the second flow channel is increased as much as possible to stabilize the state of the raw material and then perform injection.

[0033] The spiral channel 1 has a spiral angle of 45 degrees. The tangential velocity component and the axial velocity component of the raw material are equal, so that the centrifugal force and the axial propulsion force are balanced, thereby balancing the pressure fluctuation suppression effect and the raw material conveying effect of the spiral channel 1.

[0034] The size of the spiral channel 1 can be determined according to the specific injection flow requirements. The size of the spiral radius needs to be determined according to the power of the motor 4 and the rigidity of the central shaft 2, and a suitable pitch should be selected in combination with the spiral angle of 45 degrees.

[0035] refer to Figure 1 or Figure 2 It is also equipped with a support plate 12. One set of support plates 12 is rotatably connected to the feeding section 7 through bearings, and the other set of support plates 12 is rotatably connected to the discharging section 8 through bearings.

[0036] In use, the motor 4 rotates, driving the spiral flow channel 1 to rotate. After the rotation stabilizes, the acrylic sheet material is transported to the feed channel 6 through the rotary joint by the single screw pump. Then, it enters the first docking channel 9 through the feed channel 6 and smoothly transitions into the spiral flow channel 1 through the first docking channel 9. The spiral flow channel 1, through geometric constraints and centrifugal force, converts pressure fluctuation energy into heat energy or kinetic energy dispersion, reducing the formation of local high-pressure or low-pressure areas. Then, the material enters the second docking channel 10 and is smoothly guided to the discharge port 11. The discharge port 11 is connected to the mold's filling port through the rotary joint for filling.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An acrylic sheet processing and filling equipment, comprising a single screw pump, characterized in that: A spiral flow channel (1) is provided between the single screw pump and the mold filling port. The spiral flow channel (1) is spirally arranged around the central shaft (2) with equal pitch and is fixedly connected to the spiral groove (3) opened on the central shaft (2). The spiral flow channel (1) is driven to rotate by the transmission shaft (5). The transmission shaft (5) is hollow to form a feed flow channel (6). The diameter of the feed flow channel (6) is smaller than the diameter of the spiral flow channel (1). The feed flow channel (6) is sealed to the single screw pump through a rotary joint. A feed section (7) is provided upstream of the spiral flow channel (1) and a discharge section (8) is provided downstream. The radii of the feed section (7) and the discharge section (8) are larger than the maximum rotation radius of the outer wall of the spiral flow channel (1). The two ends of the feeding section (7) are coaxially fixedly connected to the central shaft (2) and the transmission shaft (5), respectively. A first docking channel (9) is opened in the feeding section (7), and the first docking channel (9) smoothly connects the spiral channel (1) and the feeding channel (6). The discharge section (8) is coaxially fixedly connected to the discharge port (11) and the central shaft (2) at both ends. A second docking channel (10) is opened in the discharge section (8). The second docking channel (10) smoothly connects the spiral channel (1) and the discharge port (11). The discharge port (11) is sealed and connected to the mold filling port through a rotary joint.

2. The acrylic sheet processing and filling equipment according to claim 1, characterized in that: The pitch of the first docking channel (9) and the second docking channel (10) is the same as the pitch of the spiral channel (1).

3. The acrylic sheet processing and filling equipment according to claim 2, characterized in that: Both the first docking channel (9) and the second docking channel (10) are configured with variable diameter spirals, and their spiral diameters change linearly along the axial direction.

4. The acrylic sheet processing and filling equipment according to claim 3, characterized in that: The diameter of the first docking channel (9) increases linearly from the same as the diameter of the feed channel (6) to the same as the diameter of the spiral channel (1); The diameter of the second docking channel (10) is linearly reduced from the same as the diameter of the spiral channel (1) to the same as the diameter of the outlet (11).

5. The acrylic sheet processing and filling equipment according to claim 1, characterized in that: The spiral flow channel (1) has a spiral angle of 45 degrees.

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