Plastic particle screening machine

Abstract

The utility model relates to the technical field of screening devices, in particular to a plastic particle screening machine which comprises a machine frame and a roller which is arranged on the machine frame in a rotating mode and provided with screening holes, the machine frame comprises at least two shaft bodies, and at least two guide wheels which are arranged at intervals in the axial direction of the shaft bodies are arranged on the shaft bodies. Each shaft body at least comprises a driving shaft body and a driven shaft body, the driving shaft body is driven by a driving part to rotate, and a guide wheel on the driving shaft body is fixed with the driving shaft body to form a driving guide wheel for driving the roller to rotate; the guide wheel on the driven shaft body can freely rotate around the axis of the driven shaft body; the screening machine further comprises a balance weight mechanism, and the balance weight mechanism is separably installed on the roller and can apply downward acting force to the roller in the rolling process of the roller. Compared with a traditional mode that a rotating shaft is arranged in the center in a penetrating mode, when the roller is disassembled, a shaft body does not need to be disassembled, operation is easier, and meanwhile installation is easy.

Description

Technical Field

[0001] This utility model relates to the field of screening device technology, specifically to a plastic particle screening machine. Background Technology

[0002] After plastic granules are prepared and molded, they sometimes need to be screened according to their size before being put into use, depending on processing requirements. The commonly used screening device is the drum screen, which uses a rotating drum screen to circulate and screen the plastic granules. During the screening process, large particles remain in the drum screen, while small particles fall out of the drum screen through the mesh, thus achieving screening. For this type of screening machine, please refer to the drum screen disclosed in announcement number CN210617031U.

[0003] Although this type of drum screen can effectively screen particles, it still has shortcomings in practical use. For example, the drum of this drum screen has a rotating shaft in the middle that is mounted on the frame. Therefore, when the drum needs to be removed from the frame for maintenance, cleaning or replacement, it usually needs to be removed along with the rotating shaft, which is obviously not easy to operate and needs to be improved. Utility Model Content

[0004] In order to solve at least one of the technical problems mentioned in the background art, the purpose of this utility model is to provide a plastic particle screening machine.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A plastic granule screening machine includes a frame and a drum rotatably mounted on the frame and having screen holes. The frame includes at least two parallel shafts for vertically supporting the drum. Each shaft has at least two guide wheels spaced apart along its axial direction. Each shaft includes at least a driving shaft and a driven shaft. The driving shaft is driven to rotate by a driving component, and the guide wheels on the driving shaft are fixed to the driving shaft to form driving guide wheels for driving the drum to rotate. The guide wheels on the driven shaft are able to rotate freely about the axis of the driven shaft. The screening machine also includes a counterweight mechanism, which is detachably mounted on the drum and can apply a downward force to the drum during its rotation.

[0007] Compared with existing technologies, the advantages of this solution are:

[0008] In this design, the drum is not directly mounted on a rotating shaft, but is directly mounted on the drive shaft and the driven shaft. During use, the guide wheels on the two shafts support the drum, and then the drive guide wheel rotates to drive the drum to rotate and perform the rolling screening action. Compared with the traditional method of mounting a rotating shaft in the center, the shaft does not need to be removed when disassembling the drum, making it easier to operate and install.

[0009] In addition, a counterweight mechanism is also provided in this scheme, which is mainly used to apply a downward force to the roller. Under the force applied by the counterweight mechanism and the roller's own weight, the roller is pressed tightly onto the guide wheel, preventing the roller from moving vertically and affecting the transmission effect between the drive guide wheel and the roller.

[0010] As an optional embodiment of this utility model, at least one end of the drum is provided with an annular guide rail coaxial with the drum; the counterweight mechanism includes a force-applying mechanism and a pressing wheel that can move vertically and rotate around its own axis, the axis of the pressing wheel being parallel to the axial direction of the drum screen; the force-applying mechanism is used to drive the pressing wheel to press against the inner circumferential wall of the guide rail.

[0011] As an optional embodiment of this utility model, the counterweight mechanism further includes a slide rail and a slider. The slide rail is fixed on the frame, and the slider is configured to slide only vertically along the slide rail. The pressure wheel is disposed on the slider to move vertically synchronously with the slider.

[0012] As an optional embodiment of this utility model, the slider is provided with a guide shaft that can move along the axial direction of the pressure wheel, and the pressure wheel is rotatably mounted on the guide shaft; the force application mechanism acts on the guide shaft to drive the pressure wheel to press against the inner circumferential wall of the guide rail.

[0013] As an optional embodiment of this utility model, the force-applying mechanism includes a bolt connected to the slide rail along a vertical thread, and a socket on the guide shaft corresponding to the bolt position for bolt insertion, wherein the socket is a blind hole.

[0014] As an optional embodiment of this utility model, the outer peripheral wall of the roller is provided with an annular groove corresponding to the guide wheel position, which allows the guide wheel to be movably embedded.

[0015] As an optional embodiment of this utility model, an annular track is fixed on the outer peripheral wall of the roller, and the groove is formed on the track.

[0016] As an optional embodiment of this utility model, an annular support ring is provided on the inner peripheral wall of the roller at the corresponding groove position.

[0017] As an optional embodiment of this utility model, the inner peripheral wall of the roller is provided with at least one rib extending along the roller axial direction.

[0018] As an optional embodiment of this utility model, the drive guide wheel and the drum are connected by friction transmission, or the drive guide wheel and the drum are connected by gear transmission.

[0019] Other advantages and effects of this utility model are explained in detail in the specific embodiments and accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the roller of this utility model;

[0022] Figure 3 for Figure 1 A magnified view of the location of the central counterweight mechanism;

[0023] Figure 4 This is a schematic diagram of the frame structure of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0025] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are used only for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Please see Figure 1-4 As shown, this embodiment provides a plastic granule screening machine, including a frame 1 and a drum 2 rotatably mounted on the frame 1 and having screen holes.

[0027] In some embodiments, such as Figure 2 As shown, the peripheral wall of the roller 2 is surrounded by a screen (e.g., wire mesh), and the end walls of the roller 2 are made of rigid plates. At least one end of the roller 2 has an opening to serve as a feed inlet and a discharge outlet, such as the case shown in this embodiment where both ends are open.

[0028] like Figure 4As shown, the frame 1 includes at least two parallel shafts for vertically supporting the roller 2. For example, the embodiment shows two shafts, one being the driving shaft 3 and the other the driven shaft 4. The distance between the two shafts is smaller than the diameter of the roller 2, so that the roller 2 can be supported between the two shafts. Figure 1 The state shown.

[0029] Each shaft is provided with two guide wheels spaced apart along the shaft axis. For ease of explanation, the guide wheel on the driving shaft 3 is referred to as the driving guide wheel 31, and the guide wheel on the driven shaft 4 is referred to as the driven guide wheel 41.

[0030] The drive shaft 3 is driven to rotate by a drive component, which can be a motor (not shown in the figure). The motor can be fixed on the frame 1, and the drive guide wheel 31 is fixed on the drive shaft 3. The motor drives the drive shaft 3 to rotate, thereby driving all the drive guide wheels 31 to rotate synchronously.

[0031] When the active guide wheel 31 rotates, it drives the drive roller 2 to rotate. In order to prevent the roller 2 from moving axially when rotating, in some embodiments, the outer peripheral wall of the roller 2 is provided with an annular groove 241 for the guide wheel to be movably embedded in the guide wheel; the groove is coaxially arranged with the roller 2.

[0032] The groove 241 can be formed by fixing an annular rigid track 24 on the outer peripheral wall of the roller 2, and the groove 241 is formed on the track 24.

[0033] The drive guide wheel 31 and the roller 2 are driven by friction to rotate the roller 2. That is, when the drive guide wheel 31 rotates, the roller 2 is driven to rotate by the friction between the drive guide wheel 31 and the bottom of the groove 241 on the outer periphery of the roller 2. In this case, in order to improve the friction, the drive guide wheel 31 is preferably a rubber wheel.

[0034] Of course, in some other alternative embodiments, the drive pulley 31 and the roller 2 can also be geared to drive the roller 2 to rotate; for example, the drive pulley is a gear, and the bottom of the corresponding groove 241 is a ring of teeth for gear meshing, so as to realize geared transmission between the two.

[0035] Since the guide wheel abuts against the bottom of the groove 241 at the location where the two abut, the track 24 will bear a large pressure at the abutment position. In order to improve the pressure-bearing effect of the track 24, in this embodiment, as follows: Figure 2 As shown, an annular support ring 21 is provided on the inner circumferential wall of the roller 2 at the position corresponding to the groove 241. The support ring 21 is used to support the track 24 to prevent the track 24 from being deformed by pressure.

[0036] Of course, it is understandable that support rings 21 can also be provided at other locations on the inner circumferential wall of the roller 2 to serve as a skeleton that supports the circumferential wall (composed of screens) of the roller 2.

[0037] In addition, in order to enable the plastic particles inside the roller 2 to tumble when the roller 2 rotates, in this embodiment, at least one rib 22 extending along the axial direction of the roller 2 is provided on the inner peripheral wall of the roller 2.

[0038] In addition, the driven guide wheel 41 can rotate freely around the axis of the driven shaft 4. For example, the driven shaft 4 is rotatably connected to the frame 1, and the driven guide wheel 41 is fixedly or rotatably mounted on the driven shaft 4. For another example, the driven shaft 4 is fixed to the frame 1, and the driven guide wheel 41 is rotatably connected to the driven shaft 4.

[0039] In addition, this embodiment also includes a counterweight mechanism 5, which is detachably mounted on the roller 2 and can apply a downward force to the roller 2 during its rolling process.

[0040] At this time, the roller 2 is supported by the guide wheels on the two shafts. The roller 2 is mounted between the two shafts. Under the weight of the roller 2 itself and the force provided by the counterweight mechanism 5, the roller 2 is firmly pressed against the guide wheels on both sides. Thus, when the active guide wheel 31 rotates, it drives the roller 2 to rotate, making it difficult for the roller 2 to move vertically when it rotates.

[0041] As can be seen, compared with the traditional method of driving the roller 2 to rotate by inserting a rotating shaft through the middle of the roller 2, this embodiment does not require inserting a rotating shaft through the middle of the roller 2. Therefore, when disassembling and assembling the roller 2, there is no need to remove the shaft (rotating shaft), making the operation easier and the installation easier.

[0042] The following is a detailed explanation of the counterweight mechanism 5:

[0043] like Figure 3 As shown, at least one end of the roller 2 is provided with an annular guide rail 23 coaxially arranged with the roller 2; preferably, both ends of the roller 2 are provided with guide rollers, and each guide rail 23 corresponds to a set of identical counterweight mechanisms 5. Taking one set of counterweight mechanisms 5 as an example:

[0044] like Figure 3 As shown, the counterweight mechanism 5 includes a pressure wheel 51, which can move vertically. For example, a vertically arranged slide rail 53 is fixed on the frame 1, and a slider 54 is slidably arranged on the slide rail 53. The slider 54 is configured to slide only vertically along the slide rail 53. For example, the slider 54 is an "I"-shaped slider 54 or a dovetail slider 54, and the slide rail 53 is adapted to it so that the slider 54 can only move vertically relative to the slide rail 53.

[0045] The axis of the pressing wheel 51 is parallel to the axial direction of the drum 2 screen; the force application mechanism is used to drive the pressing wheel 51 to press against the inner circumferential wall of the guide rail 23.

[0046] In addition, the pressure roller 51 can rotate around its own axis, and the axis of the pressure roller 51 is parallel to the axis of the roller 2.

[0047] The pressure roller 51 is mounted on the slider 54 to move vertically synchronously with the slider 54. In order to enable the pressure roller 51 to both move vertically synchronously with the slider 54 and rotate circumferentially, in this embodiment,

[0048] The slider 54 is provided with a guide shaft 52 that can move along the axial direction of the pressure wheel 51 (which can also be understood as the axial direction of the roller 2), and the pressure wheel 51 is rotatably disposed at the inner end of the guide shaft 52.

[0049] The counterweight mechanism 5 also includes a force-applying mechanism, which acts on the guide shaft 52 to drive the pressure wheel 51 to press against the inner peripheral wall of the guide rail 23.

[0050] For example, the force-applying mechanism includes a bolt 55 that is threaded vertically onto the slide rail 53, and a socket 521 on the guide shaft 52 corresponding to the position of the bolt 55 for the bolt 55 to be inserted, wherein the socket 521 is a blind hole.

[0051] The position of the insertion hole 521 on the guide shaft 52 is defined such that when the bolt 55 is inserted into the insertion hole 521, the clamping wheel 51 is exactly partially or completely in the inner ring of the guide rail 23.

[0052] When assembling roller 2, after aligning roller 2 with groove 241 and guide wheel, roller 2 is mounted on two shafts; then the guide shaft 52 is moved axially so that the insertion hole 521 of the guide shaft 52 is aligned with bolt 55. At this time, the clamping wheel 51 is just supported on the inner circumferential wall of guide rail 23; then the bolt 55 is rotated so that bolt 55 moves downward and is inserted into insertion hole 521. Finally, the lower end of bolt 55 continuously presses down on the bottom wall of insertion hole 521, so that the guide shaft 52, slider 54 and clamping wheel 51 together generate a downward force to press clamping wheel 51 on the inner ring of guide rail 23.

[0053] The design of the insertion hole 521 also prevents the guide shaft 52 and the pressure wheel 51 from moving axially after the bolt 55 is inserted, under the restriction of the bolt 55.

[0054] When it is necessary to disassemble the roller 2, simply loosen or unscrew the bolt 55, and then move the guide shaft 52 outward along the axis to drive the clamping wheel 51 out of the inner ring of the guide rail 23. In this way, without the restriction of the clamping wheel 51, the roller 2 can be lifted directly in the vertical direction to be removed from the frame 1.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A plastic granule screening machine, comprising a frame and a drum rotatably mounted on the frame and having screen holes, characterized in that, The frame includes at least two parallel shafts for vertically supporting the drum. Each shaft has at least two guide wheels spaced apart along its axial direction. Each shaft includes at least a driving shaft and a driven shaft. The driving shaft is driven to rotate by a driving component, and the guide wheels on the driving shaft are fixed to the driving shaft to form a driving guide wheel for driving the drum to rotate. The guide wheels on the driven shaft can rotate freely around the axis of the driven shaft. The screening machine also includes a counterweight mechanism, which is detachably mounted on the drum and can apply a downward force to the drum during its rotation.

2. The plastic granule screening machine according to claim 1, characterized in that, The drum has an annular guide rail at at least one end, which is coaxial with the drum. The counterweight mechanism includes a force-applying mechanism and a pressing wheel that can move vertically and rotate around its own axis. The axis of the pressing wheel is parallel to the axial direction of the drum screen. The force-applying mechanism is used to drive the pressing wheel to press against the inner circumferential wall of the guide rail.

3. A plastic granule screening machine according to claim 2, characterized in that, The counterweight mechanism also includes a slide rail and a slider. The slide rail is fixed on the frame, and the slider is configured to slide only vertically along the slide rail. The pressure wheel is mounted on the slider to move vertically synchronously with the slider.

4. A plastic granule screening machine according to claim 3, characterized in that, The slider is provided with a guide shaft that can move along the axial direction of the pressure wheel, and the pressure wheel is rotatably mounted on the guide shaft; the force application mechanism acts on the guide shaft to drive the pressure wheel to press against the inner circumferential wall of the guide rail.

5. A plastic granule screening machine according to claim 4, characterized in that, The force-applying mechanism includes a bolt connected to the slide rail along a vertical thread, and a blind hole on the guide shaft corresponding to the bolt position for bolt insertion.

6. A plastic granule screening machine according to claim 1, characterized in that, The outer peripheral wall of the roller has an annular groove corresponding to the guide wheel position, which allows the guide wheel to be movably embedded.

7. A plastic granule screening machine according to claim 6, characterized in that, An annular track is fixed on the outer peripheral wall of the roller, and the groove is formed on the track.

8. A plastic granule screening machine according to claim 6, characterized in that, The inner circumferential wall of the roller is provided with an annular support ring corresponding to the groove position.

9. A plastic granule screening machine according to claim 1, characterized in that, The inner circumferential wall of the roller is provided with at least one rib extending along the roller axial direction.

10. A plastic granule screening machine according to claim 1, characterized in that, The drive guide wheel and the drum are connected by friction drive, or the drive guide wheel and the drum are connected by gear drive.

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