Injection oil cylinder for injection molding machine

Abstract

The utility model discloses an injection oil cylinder for an injection molding machine, which comprises an oil cylinder and a piston rod, and the piston rod can extend into the oil cylinder and can move along the central axis of the piston rod in the oil cylinder; end covers are arranged at the two axial ends of the oil cylinder, so that a sealed oil cavity is formed in the oil cylinder; any end cover is connected with a displacement sensor, and the displacement sensor comprises a sensor connecting rod capable of extending into the oil cylinder; moreover, a position magnetic block capable of being matched with the sensor connecting rod is arranged at the end, close to the sensor connecting rod, of the piston rod, the position magnetic block and the piston rod move synchronously, and the displacement sensor outputs displacement signals of the piston rod by detecting magnetic field changes caused by movement of the position magnetic block. According to the utility model, the displacement sensor is directly integrated on the end cover of the injection oil cylinder, the structure is compact, the size of the whole device is reduced, and the installation space is saved; the device is compact in structure, high in measurement precision, strong in anti-interference capability and convenient to install and maintain.

Description

Technical Field

[0001] This utility model relates to the technical field of injection cylinders, and in particular to an injection cylinder for injection molding machines. Background Technology

[0002] Injection molding machines are essential equipment in the production of plastic products. The injection cylinder is the core actuator of the machine, responsible for injecting molten plastic into the mold. Precise detection of the cylinder piston rod displacement during injection is crucial for controlling the injection molding quality.

[0003] Currently, displacement sensors for injection cylinders in injection molding machines generally adopt an external mounting structure, meaning the displacement sensor is installed outside the injection cylinder. This structure has the following significant disadvantages:

[0004] First, the installation location is limited by space, which increases the overall size of the equipment;

[0005] Second, external installations are susceptible to mechanical impacts. Improper installation can easily reduce the service life of the position sensor or even cause it to be damaged.

[0006] Third, it is easily affected by external environmental interference, such as temperature changes, electromagnetic interference, vibration, etc., which affects signal stability and control accuracy, thereby reducing the consistency of injection molded product quality.

[0007] Therefore, developing a compact, accurate, and interference-resistant solution for detecting the displacement of injection cylinders has significant practical value. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] The technical problem this invention aims to solve is to provide an injection cylinder for injection molding machines that integrates a displacement sensor directly onto the end cap of the injection cylinder. This results in a compact structure, reducing the overall size of the device and saving installation space. Through the cooperation of the displacement sensor and the position magnetic block, non-contact displacement detection is achieved, avoiding mechanical wear and improving measurement accuracy and lifespan. The sensor connecting rod extends into the cylinder to directly detect piston rod movement, reducing external interference, resulting in a more stable signal, and enabling real-time monitoring of piston rod displacement, which helps improve injection molding accuracy and injection molding machine control precision. The end caps at both ends form a sealed oil cavity, ensuring the normal operation of the hydraulic system. Simultaneously, the integrated sensor results in a compact structure, high measurement accuracy, strong anti-interference capability, and convenient installation and maintenance, effectively solving the technical problems of limited installation, easy damage, and susceptibility to external interference associated with traditional external displacement sensors in injection molding machine cylinders.

[0010] (II) Technical Solution

[0011] The present invention addresses the aforementioned technical problem by providing an injection cylinder for an injection molding machine, comprising a cylinder and a piston rod. The piston rod extends into the cylinder and moves along its central axis within the cylinder. End caps are provided at both ends of the cylinder along its axial direction to form sealed oil chambers within the cylinder. A displacement sensor is connected to each end cap, and the displacement sensor includes a sensor connecting rod that extends into the cylinder. Furthermore, a position magnetic block is provided at one end of the piston rod near the sensor connecting rod, cooperating with the sensor connecting rod. The position magnetic block moves synchronously with the piston rod, and the displacement sensor outputs a displacement signal of the piston rod by detecting the change in the magnetic field caused by the movement of the position magnetic block.

[0012] Specifically, the signal output by the displacement sensor is an absolute displacement signal, which does not require zero-homing calibration.

[0013] The above-mentioned solution integrates the displacement sensor directly onto the end cap of the injection cylinder, resulting in a compact structure that reduces the overall size of the device and saves installation space. The combination of the displacement sensor and the position magnetic block enables non-contact displacement detection, avoiding mechanical wear and improving measurement accuracy and lifespan. The sensor connecting rod extends into the cylinder to directly detect piston rod movement, reducing external interference, resulting in a more stable signal, and enabling real-time monitoring of piston rod displacement, which helps improve injection molding accuracy and injection molding machine control precision. The end caps at both ends form sealed oil chambers, ensuring the normal operation of the hydraulic system, while also integrating the sensor for a compact structure.

[0014] In some embodiments, the piston rod is provided with a clearance hole for avoiding the sensor connecting rod, and the clearance hole and the sensor connecting rod are coaxially arranged.

[0015] The above solution features a coaxial design between the clearance hole and the sensor connecting rod, which avoids interference between the piston rod and the sensor connecting rod during piston rod movement, ensuring smooth movement and measurement accuracy while reducing errors caused by eccentricity. It also simplifies the structural layout, eliminates the need for additional space to accommodate the displacement sensor, and optimizes the overall size of the hydraulic cylinder.

[0016] In some embodiments, the position magnetic block is located around the piston rod where the clearance hole is located.

[0017] In some embodiments, the perforation is formed by a recess at the center of the end face of the piston rod near the sensor link, moving away from the sensor link.

[0018] With the above solution, the position magnetic block is placed around the clearance hole to ensure that changes in the magnetic field can be effectively detected by the sensor linkage, thereby improving signal sensitivity; and to avoid the position magnetic block occupying the central area of ​​the piston rod, thus maintaining the structural strength of the piston rod.

[0019] In some embodiments, the position magnetic block is fixed to the end face of the piston rod by screws.

[0020] The above solution uses screw fixing, which facilitates the installation, replacement or maintenance of the position magnetic block and reduces maintenance costs; moreover, the mechanical connection is reliable and prevents the position magnetic block from loosening and causing detection failure.

[0021] In some embodiments, a magnetic pad is provided between the position magnetic block and the end face of the piston rod.

[0022] By adopting the above scheme, the magnetic pad can enhance the magnetic field conduction efficiency and improve the detection accuracy of the displacement sensor; the setting of the magnetic pad can buffer vibration and reduce mechanical wear between the position magnetic block and the piston rod.

[0023] In some embodiments, the end cap is provided with a through hole into which the sensor link extends.

[0024] In some embodiments, the perforation is located at the center of the end cap.

[0025] The above solution allows the perforated design to facilitate the precise insertion of the sensor connecting rod into the hydraulic cylinder, avoiding installation deviations that could affect detection; it also simplifies the end cap structure and reduces processing difficulty.

[0026] In some embodiments, a sealing structure is provided at the connection between the displacement sensor and the end cap.

[0027] In some embodiments, the sealing structure includes an O-ring and a dust seal to ensure that the cylinder does not leak oil under high-pressure working conditions.

[0028] By adopting the above solution, the sealing structure can prevent oil leakage, protect the displacement sensor from contamination or corrosion, and ensure the sealing of the oil chamber, maintaining the pressure stability of the hydraulic system.

[0029] In some embodiments, the displacement sensor is detachably connected to the end cap via a threaded connection.

[0030] The above solution facilitates the quick assembly and disassembly of the displacement sensor, making it easy to debug or replace; the connection method is also stable, has good shock resistance, and is suitable for high-pressure hydraulic cylinder environments.

[0031] In some embodiments, the displacement sensor includes a magnetically levitated displacement sensor.

[0032] Specifically, the magnetic levitation displacement sensor uses non-contact magnetic levitation measurement technology, which can provide high-speed and high-precision displacement output.

[0033] Using the above solution, the magnetic levitation displacement sensor has high accuracy and fast response, making it suitable for the high-precision control requirements of injection molding machines. The non-contact magnetic levitation measurement principle eliminates mechanical wear and contact errors, directly measuring piston rod displacement with high accuracy. Non-contact measurement can further reduce wear and extend service life.

[0034] In some embodiments, the hydraulic cylinder includes a cylinder body and a cylinder barrel connected to each other; an end cap is provided at the end of the cylinder body away from the cylinder barrel; an end cap is provided at the end of the cylinder barrel away from the cylinder body, and the displacement sensor is connected to the end cap located on the cylinder barrel.

[0035] In some embodiments, one end of the cylinder barrel is fixed to the cylinder body by bolts for easy disassembly and assembly; the cylinder body and the cylinder barrel have interconnected cavities to form the oil chamber; and both ends of the cylinder body have mating holes for accommodating the piston rod to restrict the displacement of the piston rod along the oil chamber. The central axes of the mating holes, the oil chamber, the piston rod, the clearance hole, the sensor connecting rod, and the through hole are on the same straight line, which can ensure the measurement accuracy of the piston rod displacement and reduce errors caused by eccentricity.

[0036] The above-mentioned design allows for separate processing and assembly of the cylinder block and cylinder barrel, reducing manufacturing costs. The displacement sensor is installed on the cylinder barrel end cover, away from the high-pressure area of ​​the cylinder block, reducing vibration interference and improving detection reliability.

[0037] The working principle of this invention is as follows: When the hydraulic system drives the piston rod to move, the position magnetic block installed on the piston rod moves synchronously; the displacement sensor detects the change in magnetic field strength and converts this change into an electrical signal; the signal processing circuit integrated inside the displacement sensor converts the collected raw signal into a standard digital or analog output signal; finally, the injection molding machine control system receives the signal and adjusts the injection parameters in real time to form a closed-loop control.

[0038] (III) Beneficial Effects

[0039] Compared with the prior art, this utility model designs an injection cylinder for an injection molding machine.

[0040] (1) This utility model integrates the displacement sensor directly onto the end cap of the injection cylinder, resulting in a compact structure, reduced overall device volume, and saved installation space. Through the cooperation of the displacement sensor and the position magnetic block, non-contact displacement detection is achieved, avoiding mechanical wear and improving measurement accuracy and lifespan. The sensor connecting rod extends into the cylinder to directly detect the piston rod movement, reducing external interference, making the signal more stable, and enabling real-time monitoring of piston rod displacement, which helps improve injection molding accuracy and injection molding machine control accuracy. The end caps at both ends form a sealed oil cavity, ensuring the normal operation of the hydraulic system, while integrating the sensor, resulting in a compact structure.

[0041] (2) This utility model avoids interference between the piston rod and the sensor rod when the piston rod moves by using a coaxial design of the clearance hole and the sensor rod, ensuring smooth movement and measurement accuracy, and reducing errors caused by eccentricity; it simplifies the structural layout, eliminates the need for extra space to accommodate the displacement sensor, and optimizes the overall size of the cylinder; in addition, the position magnetic block is set around the clearance hole to ensure that changes in the magnetic field can be effectively detected by the sensor rod, thereby improving signal sensitivity; it also avoids the position magnetic block occupying the central area of ​​the piston rod, thus maintaining the structural strength of the piston rod.

[0042] (3) The position magnetic block of this utility model is fixed to the end face of the piston rod by screws, which facilitates the installation, replacement or maintenance of the position magnetic block and reduces maintenance costs; and the mechanical connection is reliable, preventing the position magnetic block from loosening and causing detection failure.

[0043] (4) The magnetic pad of this utility model can enhance the magnetic field conduction efficiency and improve the detection accuracy of the displacement sensor; the magnetic pad can buffer vibration and reduce mechanical wear between the position magnetic block and the piston rod.

[0044] (5) The sealing structure of this utility model can prevent oil leakage, protect the displacement sensor from contamination or corrosion, and ensure the sealing of the oil chamber and maintain the pressure stability of the hydraulic system.

[0045] (6) The displacement sensor of this utility model can be detachably connected to the end cover by means of threaded connection, which facilitates quick disassembly and assembly of the displacement sensor and makes it convenient for debugging or replacement; and the connection method is stable, has good shock resistance, and is suitable for high pressure cylinder environment.

[0046] (7) The displacement sensor of this utility model is a magnetic levitation displacement sensor, which adopts non-contact magnetic levitation measurement technology and can provide high-speed and high-precision displacement output; the magnetic levitation displacement sensor has high accuracy and fast response, which is suitable for the high-precision control requirements of injection molding machines; the non-contact magnetic levitation measurement principle eliminates mechanical wear and contact error, and directly measures the piston rod displacement with high accuracy; non-contact measurement can further reduce wear and extend service life.

[0047] (8) The separate design of the cylinder body and cylinder barrel of this utility model is convenient for processing and assembly, reducing manufacturing costs; the displacement sensor is installed on the cylinder barrel end cover, away from the high pressure area of ​​the cylinder body, reducing vibration interference and improving detection reliability. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of an injection cylinder for an injection molding machine according to the present invention;

[0050] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0051] The component names corresponding to the various reference numerals in the figure are as follows: 100, hydraulic cylinder; 101, end cap; 1011, perforation; 102, oil chamber; 103, cylinder body; 104, cylinder barrel; 200, piston rod; 201, clearance hole; 300, displacement sensor; 301, sensor connecting rod; 400, position magnetic block; 401, screw; 500, magnetic gasket; 600, sealing structure. Detailed Implementation

[0052] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] It should be noted that the following description covers various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0056] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0057] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0058] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0059] like Figures 1-2As shown, this utility model provides an injection cylinder for an injection molding machine, including a cylinder 100 and a piston rod 200. The piston rod 200 can extend into the cylinder 100 and move along its own central axis within the cylinder 100. End caps 101 are provided at both ends of the cylinder 100 along its axial direction to form sealed oil chambers 102 within the cylinder 100. A displacement sensor 300 is connected to either end cap 101. The displacement sensor 300 includes a sensor connecting rod 301 that can extend into the cylinder 100. Furthermore, a position magnetic block 400 is provided at one end of the piston rod 200 near the sensor connecting rod 301, which cooperates with the sensor connecting rod 301. The position magnetic block 400 moves synchronously with the piston rod 200. The displacement sensor 300 outputs a displacement signal of the piston rod 200 by detecting the change in the magnetic field caused by the movement of the position magnetic block 400. Specifically, the signal output by the displacement sensor 300 is an absolute displacement signal, requiring no zero-return calibration. Using the above scheme, the displacement sensor 300 is directly integrated into the end cap 101 of the injection cylinder 100, resulting in a compact structure, reduced overall device size, and saved installation space. Through the cooperation of the displacement sensor 300 and the position magnetic block 400, non-contact displacement detection is achieved, avoiding mechanical wear and improving measurement accuracy and lifespan. The sensor connecting rod 301 extends into the cylinder 100 to directly detect the movement of the piston rod 200, reducing external interference, resulting in a more stable signal, and enabling real-time monitoring of the piston rod 200 displacement, which helps improve injection molding accuracy and injection molding machine control accuracy. The end caps 101 at both ends form a sealed oil cavity 102, ensuring the normal operation of the hydraulic system, while also integrating the sensor for a compact structure.

[0060] In some embodiments, the piston rod 200 is provided with a clearance hole 201 for avoiding the sensor connecting rod 301, and the clearance hole 201 and the sensor connecting rod 301 are coaxially arranged. By adopting the above scheme, the clearance hole 201 and the sensor connecting rod 301 are designed coaxially, avoiding interference between the piston rod 200 and the sensor connecting rod 301 during movement, ensuring smooth movement, ensuring measurement accuracy, and reducing errors caused by eccentricity; it simplifies the structural layout, eliminating the need for additional space to accommodate the displacement sensor 300, and optimizing the overall size of the cylinder 100. In some embodiments, the position magnetic block 400 is located around the piston rod 200 at the periphery of the clearance hole 201. In some embodiments, the through hole 1011 is formed by an inward recess at the center of the end face of the piston rod 200 near the sensor connecting rod 301, moving away from the sensor connecting rod 301. In the above scheme, the position magnetic block 400 is located around the clearance hole 201, ensuring that changes in the magnetic field can be effectively detected by the sensor connecting rod 301, thus improving signal sensitivity; and preventing the position magnetic block 400 from occupying the central area of ​​the piston rod 200, maintaining the structural strength of the piston rod 200. In some embodiments, the position magnetic block 400 is fixed to the end face of the piston rod 200 by screws 401. Using the above scheme and the screw 401 fixing method facilitates the installation, replacement, or maintenance of the position magnetic block 400, reducing maintenance costs; and the mechanical connection is reliable, preventing the position magnetic block 400 from loosening and causing detection failure. In some embodiments, a magnetically conductive pad 500 is provided between the end face of the position magnetic block 400 and the piston rod 200. Using the above scheme, the magnetically conductive pad 500 can enhance the magnetic field conduction efficiency, improve the detection accuracy of the displacement sensor 300; the magnetically conductive pad 500 can buffer vibration and reduce mechanical wear between the position magnetic block 400 and the piston rod 200.

[0061] In some embodiments, the end cap 101 is provided with a through hole 1011 for the sensor connecting rod 301 to extend into. In some embodiments, the through hole 1011 is located at the center of the end cap 101. With the above design, the through hole 1011 facilitates the precise insertion of the sensor connecting rod 301 into the hydraulic cylinder 100, avoiding installation deviations from affecting detection; it also simplifies the structure of the end cap 101 and reduces processing difficulty.

[0062] In some embodiments, a sealing structure 600 is provided at the connection between the displacement sensor 300 and the end cap 101. In some embodiments, the sealing structure 600 includes an O-ring and a dust ring to ensure that the cylinder 100 does not leak oil under high-pressure operating conditions. Using the above solution, the sealing structure 600 can prevent oil leakage, protect the displacement sensor 300 from contamination or corrosion, and ensure the sealing of the oil chamber 102, maintaining the pressure stability of the hydraulic system.

[0063] In some embodiments, the displacement sensor 300 is detachably connected to the end cover 101 via a threaded connection. This threaded connection facilitates quick assembly and disassembly of the displacement sensor 300, making it convenient for debugging or replacement; the connection is also robust, shock-resistant, and suitable for the high-pressure cylinder 100 environment. In some embodiments, the displacement sensor 300 is a magnetic levitation displacement sensor 300. Specifically, the magnetic levitation displacement sensor 300 employs non-contact magnetic levitation measurement technology, providing high-speed, high-precision displacement output. This solution provides the magnetic levitation displacement sensor 300 with high accuracy and fast response, suitable for the high-precision control requirements of injection molding machines; the non-contact magnetic levitation measurement principle eliminates mechanical wear and contact errors, directly measuring the displacement of the piston rod 200 with high accuracy; non-contact measurement further reduces wear and extends service life.

[0064] In some embodiments, the hydraulic cylinder 100 includes a cylinder body 103 and a cylinder barrel 104 connected to each other; an end cap 101 is provided at one end of the cylinder body 103 away from the cylinder barrel 104; an end cap 101 is provided at one end of the cylinder barrel 104 away from the cylinder body 103, and the displacement sensor 300 is connected to the end cap 101 located on the cylinder barrel 104. In some embodiments, one end of the cylinder barrel 104 is fixed to the cylinder body 103 by bolts for easy disassembly and assembly. The cylinder body 103 and the cylinder barrel 104 have interconnected cavities to form the oil chamber 102. Furthermore, both ends of the cylinder body 103 have mating holes 1031 for accommodating the piston rod 200, thus limiting the displacement of the piston rod 200 along the oil chamber 102. The central axes of the mating holes 1031, the oil chamber 102, the piston rod 200, the clearance hole 201, the sensor connecting rod 301, and the through hole 1011 are all on the same straight line, ensuring the accuracy of piston rod 200 displacement measurement and reducing errors caused by eccentricity. Using the above scheme, the separate design of the cylinder body 103 and the cylinder barrel 104 facilitates processing and assembly, reducing manufacturing costs. The displacement sensor 300 is installed on the end cap 101 of the cylinder barrel 104, away from the high-pressure area of ​​the cylinder body 103, reducing vibration interference and improving detection reliability.

[0065] The working principle of this utility model is as follows: When the hydraulic system drives the piston rod 200 to move, the position magnetic block 400 installed on the piston rod 200 moves synchronously; the displacement sensor 300 detects the change in magnetic field strength and converts this change into an electrical signal; the signal processing circuit integrated inside the displacement sensor 300 converts the collected raw signal into a standard digital or analog output signal; finally, the injection molding machine control system receives the signal and adjusts the injection parameters in real time to form a closed-loop control.

[0066] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0067] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An injection cylinder for an injection molding machine, characterized in that: The system includes a hydraulic cylinder (100) and a piston rod (200), the piston rod (200) being able to extend into the hydraulic cylinder (100) and move along its own central axis within the hydraulic cylinder (100); both ends of the hydraulic cylinder (100) are provided with end caps (101) to form sealed oil chambers (102) within the hydraulic cylinder (100); wherein a displacement sensor (300) is connected to either end cap (101), the displacement sensor (300) including a function... A sensor connecting rod (301) is provided that can extend into the oil cylinder (100); and a position magnetic block (400) that can cooperate with the sensor connecting rod (301) is provided at one end of the piston rod (200). The position magnetic block (400) moves synchronously with the piston rod (200). The displacement sensor (300) outputs the displacement signal of the piston rod (200) by detecting the change in magnetic field caused by the movement of the position magnetic block (400).

2. The injection cylinder for an injection molding machine according to claim 1, characterized in that: The piston rod (200) is provided with a clearance hole (201) for avoiding the sensor connecting rod (301), and the clearance hole (201) and the sensor connecting rod (301) are coaxially arranged.

3. The injection cylinder for an injection molding machine according to claim 2, characterized in that: The position magnetic block (400) is located around the piston rod (200) in the clearance hole (201).

4. The injection cylinder for an injection molding machine according to claim 1, characterized in that: The position magnetic block (400) is fixed to the end face of the piston rod (200) by screws (401).

5. The injection cylinder for an injection molding machine according to claim 4, characterized in that: A magnetic pad (500) is provided between the end faces of the position magnetic block (400) and the piston rod (200).

6. The injection cylinder for an injection molding machine according to claim 1, characterized in that: The end cap (101) is provided with a through hole (1011) for the sensor connecting rod (301) to extend into.

7. The injection cylinder for an injection molding machine according to claim 1, characterized in that: A sealing structure (600) is provided at the connection between the displacement sensor (300) and the end cap (101).

8. The injection cylinder for an injection molding machine according to claim 1, characterized in that: The displacement sensor (300) is detachably connected to the end cap (101) via a threaded connection.

9. The injection cylinder for an injection molding machine according to claim 1, characterized in that: The displacement sensor (300) includes a magnetic levitation displacement sensor (300).

10. The injection cylinder for an injection molding machine according to claim 1, characterized in that: The hydraulic cylinder (100) includes a cylinder body (103) and a cylinder barrel (104) connected to each other; an end cap (101) is provided at one end of the cylinder body (103) away from the cylinder barrel (104); an end cap (101) is provided at one end of the cylinder barrel (104) away from the cylinder body (103), and the displacement sensor (300) is connected to the end cap (101) located on the cylinder barrel (104).

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