A hollow shaft hydraulic motor for injection molding machine

Abstract

The present invention relates to the technical field of injection molding machines, and discloses a hollow shaft hydraulic motor for an injection molding machine. The hollow shaft hydraulic motor is used to drive a screw of the injection molding machine, and comprises: an outer shell, the side wall of the outer shell is arranged in a cylindrical shape; a main shaft rotatably arranged in the outer shell, the main shaft is provided with connecting holes penetrating the two end surfaces of the main shaft, the center line of the connecting hole and the center line of the outer shell are located on the same straight line, and one end of the screw can be movably clamped in the connecting hole; a driving member, the driving member is arranged on the outer shell, and is used to drive the main shaft to rotate. The advantage of the present invention is that the setting of the connecting hole simplifies the motor structure and saves production costs, and one end of the screw can be movably clamped in the connecting hole and rotates with the main shaft, and there is no need to adjust the concentricity of the main shaft and the screw, which simplifies the installation process.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, in particular to a hollow shaft hydraulic motor used for injection molding machines. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. The injection system of the injection molding machine generally has three main forms: plunger type, screw type, and screw pre-plasticized plunger injection type. The most widely used one is the screw type. Its function is to heat and plasticize a certain amount of plastic within a specified time in one cycle of the injection molding machine, and then inject the molten plastic into the mold cavity through the screw under a certain pressure and speed. The rotation of the screw is mainly driven by a motor. The existing motor is usually equipped with an output shaft, and the output shaft and the screw are connected by a coupling. When connecting the output shaft and the screw, it is necessary to adjust the concentricity of the output shaft and the screw to ensure the reliability of motion transmission. The installation process is relatively complicated, and a coupling is required to connect the motor and the screw, which increases the production cost. Summary of the invention

[0003] The present invention is made in consideration of the above-mentioned problems, and an object of the invention is to provide a hollow shaft hydraulic motor for an injection molding machine, which can reduce production costs and simplify the installation process.

[0004] To achieve the above object, the present invention provides a hollow shaft hydraulic motor for an injection molding machine, wherein the hollow shaft hydraulic motor is used to drive a screw of the injection molding machine, comprising:

[0005] A shell, wherein the side wall of the shell is arranged in a cylindrical shape;

[0006] A main shaft rotatably arranged in the housing, the main shaft is provided with connecting holes penetrating through both end surfaces of the main shaft, the center line of the connecting hole and the center line of the housing are located on the same straight line, and one end of the screw rod is movably clamped in the connecting hole;

[0007] A driving member is arranged on the housing and is used for driving the main shaft to rotate.

[0008] According to the above-mentioned hollow shaft hydraulic motor for an injection molding machine, the main shaft includes a first rotating shaft and a second rotating shaft and a third rotating shaft respectively arranged at both ends of the main shaft, and the connecting hole passes through the first rotating shaft, the second rotating shaft and the third rotating shaft; the central axes of the second rotating shaft and the third rotating shaft are located on the same straight line and are staggered with the central axis of the first rotating shaft.

[0009] According to the hollow shaft hydraulic motor for an injection molding machine described above, pressure covers are provided at both ends of the outer shell, bearings are provided in the outer shell, the second rotating shaft and the third rotating shaft are both connected to one of the bearings, and a through hole is provided on the pressure cover, and the through hole is connected to the connecting hole.

[0010] According to the hollow shaft hydraulic motor for an injection molding machine described above, the center line of the connecting hole and the center axis of the second rotating shaft are located on the same straight line.

[0011] According to the hollow shaft hydraulic motor for an injection molding machine described above, a first limiting portion is provided in the connecting hole, a second limiting portion is provided on the screw rod, and the first limiting portion is connected to the second limiting portion.

[0012] According to the hollow shaft hydraulic motor for an injection molding machine described above, the first limiting portion is configured as a guide groove, the second limiting portion is configured as a limiting protrusion, and the limiting protrusion can be movably clamped in the guide groove.

[0013] According to the above-mentioned hollow shaft hydraulic motor for an injection molding machine, the driving member includes a plurality of plunger cylinders, and the plurality of plunger cylinders are equidistantly distributed on the side wall of the outer shell, and one end of each of the plunger cylinders is arranged in the outer shell and can abut against the side wall of the first rotating shaft.

[0014] According to the above-mentioned hollow shaft hydraulic motor for an injection molding machine, an outer sleeve is provided on the outer side of the first rotating shaft, and a pressure rod and a pressure plate are provided on the bottom of the plunger cylinder; the pressure plate is arranged in the outer sleeve and can abut against the outer sleeve; one end of the pressure rod is connected to the plunger cylinder, and the other end is connected to the pressure plate.

[0015] According to the above-mentioned hollow shaft hydraulic motor for an injection molding machine, the driving component also includes an oil supply cover, an oil distribution plate and a connecting shaft, the oil supply cover is arranged on the outside of the outer shell; the oil distribution plate is arranged on the inside of the oil supply cover and is used to supply oil to the plunger cylinder, and the connecting shaft is used to drive the oil distribution plate to rotate.

[0016] The present invention has the following beneficial effects:

[0017] 1. The main shaft is provided with connecting holes that penetrate through both end surfaces of the main shaft. One end of the screw rod can be movably clamped in the connecting hole so that it can rotate with the main shaft. The setting of the connecting hole saves production costs and simplifies the installation process;

[0018] 2. The central axes of the second rotating shaft and the third rotating shaft are located on the same straight line and are staggered with the central axis of the first rotating shaft to form a cam mechanism. The cam mechanism has the characteristics of compact structure and high reliability, can obtain smooth movement, and can improve the stability of screw rotation;

[0019] 3. A bearing is arranged in the housing, and the second rotating shaft and the third rotating shaft are both connected to a bearing. The bearing is used to support the second rotating shaft and the third rotating shaft, which can reduce the friction coefficient during the movement and ensure the rotation accuracy;

[0020] 4. A guide groove is provided in the connecting hole, and a limit protrusion is provided on the screw. The limit protrusion can be movably clamped in the guide groove to limit the relative rotation between the screw and the main shaft, ensuring that the screw can rotate with the main shaft;

[0021] 5. The hollow shaft hydraulic motor is a radial piston motor, which has the advantages of simple structure, small size, light weight, reliable operation, long life and low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 yes Figure 1 Schematic diagram from another perspective;

[0024] Figure 3 It is a schematic diagram of the connection between the driving member and the main shaft of the present invention;

[0025] Figure 4 is a main axis sectional view of the present invention;

[0026] Figure 5 It is a schematic diagram of the connection between the main shaft and the bearing of the present invention;

[0027] Figure 6 It is a schematic diagram of the plunger cylinder structure of the present invention;

[0028] In the figure: 100, housing; 110, pressure cover; 111, bearing; 200, main shaft; 210, first rotating shaft; 211, outer sleeve; 220, second rotating shaft; 230, third rotating shaft; 231, limiting sleeve; 240, connecting hole; 241, first limiting part; 242, guide groove; 300, driving member; 310, plunger cylinder; 311, pressure rod; 312, pressure plate; 320, oil supply cover; 330, oil distribution plate; 340, connecting shaft. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] like Figure 1-6 As shown, a hollow shaft hydraulic motor for an injection molding machine, the hollow shaft hydraulic motor is used to drive the screw of the injection molding machine, driving the screw of the injection molding machine to rotate, comprising:

[0031] The housing 100 has a side wall that is cylindrical.

[0032] A main shaft 200 is rotatably arranged in the housing 100, and a connecting hole 240 is provided on the main shaft 200 and passes through the two end surfaces of the main shaft 200. The center line of the connecting hole 240 is on the same straight line as the center line of the housing 100, and one end of the screw is movably clamped in the connecting hole 240; one end of the screw is movably clamped in the connecting hole 240 of the main shaft 200, and the main shaft 200 drives the screw to rotate. Compared with the prior art, the setting of the connecting hole 240 simplifies the structure of the motor, saves production materials, and saves production costs. Moreover, when one end of the screw is installed in the connecting hole 240, the screw can rotate with the main shaft 200, which simplifies the installation process and improves work efficiency.

[0033] The driving member 300 is disposed on the housing 100 and is used to drive the main shaft 200 to rotate. The driving member 300 can drive the screw to rotate, thereby completing the injection molding process.

[0034] The main shaft 200 includes a first rotating shaft 210 and a second rotating shaft 220 and a third rotating shaft 230 respectively arranged at both ends of the main shaft 200. The connecting hole 240 passes through the first rotating shaft 210, the second rotating shaft 220 and the third rotating shaft 230; the central axes of the second rotating shaft 220 and the third rotating shaft 230 are located on the same straight line and are staggered with the central axis of the first rotating shaft 210. The central axes of the second rotating shaft 220 and the third rotating shaft 230 are located on the same straight line, which ensures the coaxiality of the second rotating shaft 220 and the third rotating shaft 230 and ensures the stability of the screw rotation; the first rotating shaft 210, the second rotating shaft 220 and the third rotating shaft 230 form a cam mechanism respectively, and the cam mechanism has the characteristics of compact structure and high reliability. The cam mechanism can obtain smooth movement and can also maintain synchronization when the speed changes, which can improve the stability of the screw rotation; and the cam mechanism has a low failure rate, which reduces the maintenance frequency.

[0035] A pressure cover 110 is provided at both ends of the outer shell 100, and a bearing 111 is provided in the outer shell 100. The second rotating shaft 220 and the third rotating shaft 230 are both connected to a bearing 111, and a through hole is provided on the pressure cover 110, which is connected to the connecting hole 240. The bearing 111 is used to support the second rotating shaft 220 and the third rotating shaft 230, which can reduce the friction coefficient during their movement and ensure their rotation accuracy; the setting of the pressure cover 110 blocks the connection between the inside of the motor and the outside world, and can prevent dust from entering the inside of the motor; the setting of the through hole allows one end of the screw to pass through the through hole on the pressure cover 110 and be set in the connecting hole 240.

[0036] In this embodiment, a limit sleeve 231 is provided at the end of the third rotating shaft 230 away from the first rotating shaft 210, and the limit sleeve 231 can abut against the bearing 111 to prevent the third rotating shaft 230 from being separated from the bearing 111; the bearing 111 adopts a tapered roller bearing, and the tapered roller bearing can withstand large radial loads and axial loads; in addition, the pressure cover 110 on the outer shell includes an upper pressure cover and a lower pressure cover, and both the upper pressure cover and the lower pressure cover are provided with through holes.

[0037] The center line of the connecting hole 240 and the center axis of the second rotating shaft 220 are located on the same straight line, so that the connecting hole 240 and the second rotating shaft 220 have the same rotation center line. The rotation of the second rotating shaft 220 can drive the screw to rotate, thereby completing the injection molding process.

[0038] A first limiting portion 241 is provided in the connecting hole 240 , and a second limiting portion is provided on the screw rod. The first limiting portion 241 is connected to the second limiting portion, which limits the relative rotation between the screw rod and the main shaft 200 , ensuring that the screw rod can rotate with the main shaft 200 .

[0039] The first limiting portion 241 is set as a guide groove 242, and the second limiting portion is set as a limiting protrusion. The limiting protrusion can be movably clamped in the guide groove 242, thereby limiting the relative rotation between the screw and the main shaft 200, ensuring that the screw can rotate with the main shaft 200, and there is no need to adjust the concentricity, thereby simplifying the installation process; in addition, the connection between the screw and the main shaft 200 can also adopt a key connection. The key connection has the characteristics of simple structure, easy disassembly and assembly, and good centering performance, thereby ensuring that the screw can rotate with the main shaft 200, and there is no need to adjust the concentricity of the screw and the main shaft 200, thereby simplifying the installation process.

[0040] The driving member 300 includes a plurality of plunger cylinders 310, which are equidistantly distributed on the side wall of the housing 100, and one end of each plunger cylinder 310 is arranged in the housing 100 and can abut against the side wall of the first rotating shaft 210. By controlling the extension and contraction of the plunger cylinder 310, the first rotating shaft 210 is driven to rotate, and the second rotating shaft 220 and the third rotating shaft 230 are driven to rotate, thereby driving the screw to rotate. The transmission process works reliably and can ensure the stability of the screw rotation.

[0041] In this embodiment, the number of plunger cylinders of the hollow shaft hydraulic motor is five, and the stability of its transmission process is higher. In addition, the number of plunger cylinders of the hollow shaft hydraulic motor can also be seven, ten, etc., which is also within the protection scope of the present application.

[0042] An outer sleeve 211 is provided on the outer side of the first rotating shaft 210, and a pressure rod 311 and a pressure plate 312 are provided at the bottom of the piston cylinder 310; the pressure plate 312 is arranged in the outer shell 100 and can abut against the outer sleeve 211; one end of the pressure rod 311 is connected to the piston cylinder 310, and the other end is connected to the pressure plate 312. A outer sleeve 211 is provided between the first rotating shaft 210 and the piston cylinder 310. The outer sleeve 211 avoids direct contact between the piston cylinder 310 and the first rotating shaft 210, reduces the wear of the first rotating shaft 210, and improves the service life of the hollow shaft hydraulic motor.

[0043] The driving member 300 also includes an oil supply cover 320, an oil distribution plate 330 and a connecting shaft 340. The oil supply cover 320 is arranged on the outside of the outer shell 100; the oil distribution plate 330 is arranged on the inside of the oil supply cover 320, and is used to supply oil to the plunger cylinder 310, and the connecting shaft 340 is used to drive the oil distribution plate to rotate; the main shaft 200 drives the connecting shaft 340 to rotate through gears, and the connecting shaft 340 drives the oil distribution plate 330 to rotate, completing the oil supply process of the plunger cylinder 310, thereby ensuring the stable operation of the hollow shaft hydraulic motor.

[0044] In this embodiment, the hollow shaft hydraulic motor is a radial piston motor, and its working principle is as follows: the hydraulic oil passes through the oil supply cover 320, the oil distribution plate 330 and the connecting shaft 340 in sequence into the piston cylinder 310, the pressure rod 311 extends out and tightly presses against the outer sleeve 211, the outer sleeve 211 presses against the side wall of the first rotating shaft 210, so that the first rotating shaft 210 rotates, and after the first rotating shaft 210 rotates a certain angle, it continues to supply oil to the next piston cylinder 310, driving the first rotating shaft 210 to rotate a certain angle again, repeating the above process, completing the rotation of the first rotating shaft 210, driving the second rotating shaft 220 and the third rotating shaft 230 to rotate, thereby driving the screw to rotate; the hollow shaft hydraulic motor has the advantages of simple structure, small size, light weight, reliable operation, long life and low noise.

[0045] Of course, the hollow shaft hydraulic motor provided in this application can be applied not only to the technical field of injection molding machines, but also to other fields and transmission structures.

[0046] The present invention provides a hollow shaft hydraulic motor for an injection molding machine, wherein a main shaft is provided with connecting holes penetrating through both end surfaces of the main shaft, one end of a screw rod is movably clamped in the connecting hole, and the screw rod is driven to rotate by the main shaft, which simplifies the motor structure, saves production costs, simplifies the installation process, and improves work efficiency; a guide groove is provided in the connecting hole, and a limiting protrusion is provided on the screw rod, and the two are connected, thereby limiting the relative rotation between the screw rod and the main shaft, and ensuring that the screw rod can rotate together with the main shaft.

[0047] The technical solution of the present invention is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the concept of the present invention. The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art of the invention may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

[0048] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A hollow shaft hydraulic motor for an injection molding machine, wherein the hollow shaft hydraulic motor is used to drive a screw of the injection molding machine, characterized in that: include: A shell, wherein the side wall of the shell is arranged in a cylindrical shape; A main shaft rotatably arranged in the housing, the main shaft is provided with connecting holes penetrating through both end surfaces of the main shaft, the center line of the connecting hole and the center line of the housing are located on the same straight line, and one end of the screw rod is movably clamped in the connecting hole; A driving member, which is disposed on the housing and is used to drive the main shaft to rotate; The main shaft comprises a first rotating shaft, and a second rotating shaft and a third rotating shaft respectively arranged at two ends of the main shaft, the connecting hole passes through the first rotating shaft, the second rotating shaft and the third rotating shaft; the central axes of the second rotating shaft and the third rotating shaft are located on the same straight line and are staggered with the central axis of the first rotating shaft; The driving member comprises a plurality of plunger cylinders, which are equidistantly distributed on the side wall of the housing, and one end of each plunger cylinder is disposed in the housing and abuts against the side wall of the first rotating shaft; The driving member further comprises an oil supply cover, an oil distribution plate and a connecting shaft, wherein the oil supply cover is arranged on the outer side of the housing; the oil distribution plate is arranged on the inner side of the oil supply cover and is used to supply oil to the plunger cylinder, and the connecting shaft is used to drive the oil distribution plate to rotate; The connecting shaft is located at one side of the main shaft and is connected to the main shaft through a gear.

2. A hollow shaft hydraulic motor for an injection molding machine according to claim 1, characterized in that: Both ends of the shell are provided with pressure covers, a bearing is provided in the shell, the second rotating shaft and the third rotating shaft are both connected to one of the bearings, and a through hole is provided on the pressure cover, and the through hole is communicated with the connecting hole.

3. A hollow shaft hydraulic motor for an injection molding machine according to claim 2, characterized in that: The center line of the connecting hole and the center axis of the second rotating shaft are located on the same straight line.

4. A hollow shaft hydraulic motor for an injection molding machine according to claim 1 or 3, characterized in that: A first limiting portion is disposed in the connecting hole, a second limiting portion is disposed on the screw rod, and the first limiting portion is connected to the second limiting portion.

5. A hollow shaft hydraulic motor for an injection molding machine according to claim 4, characterized in that: The first limiting portion is configured as a guide groove, and the second limiting portion is configured as a limiting protrusion, and the limiting protrusion can be movably clamped in the guide groove.

6. A hollow shaft hydraulic motor for an injection molding machine according to claim 1, characterized in that: A sleeve is provided on the outer side of the first rotating shaft, and a pressure rod and a pressure plate are provided on the bottom of the plunger cylinder; the pressure plate is arranged in the outer shell and abuts against the sleeve; one end of the pressure rod is connected to the plunger cylinder, and the other end is connected to the pressure plate.

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