CN217900785U - Detection apparatus for oil film thickness in injection molding machine - Google Patents
Detection apparatus for oil film thickness in injection molding machine Download PDFInfo
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- CN217900785U CN217900785U CN202221460256.7U CN202221460256U CN217900785U CN 217900785 U CN217900785 U CN 217900785U CN 202221460256 U CN202221460256 U CN 202221460256U CN 217900785 U CN217900785 U CN 217900785U
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Abstract
The invention discloses a device for detecting the thickness of an oil film in an injection molding machine, which relates to the field of injection molding machines.
Description
Technical Field
The utility model relates to an injection molding machine field especially relates to a detection apparatus for oil film thickness in injection molding machine.
Background
A three-plate injection molding machine is an injection molding machine with the largest sales volume in the current injection molding machine industry and can solve the production and manufacturing problems of various injection molding processes. As shown in fig. 6, the main working parts of the three-plate injection molding machine include: the injection part comprises an injection part 1, a locking nut 2, a head plate 3, a mould 4, a pull rod 5, a second plate 6, a front connecting rod 7, a thrust seat 8, a small connecting rod 9, a rear connecting rod 10, a tail plate 11 and a push-pull rod 12. The mold opening and closing movement of the injection molding machine mainly depends on a connecting rod part: a front connecting rod 7, a thrust seat 8, a small connecting rod 9, a rear connecting rod 10 and a push-pull rod 12. When the mold needs to be closed, the push-pull rod 12 pushes the thrust seat 8 forward, and the thrust seat 8 drives the small connecting rod 9 to move and drives the front connecting rod 7 and the rear connecting rod 10 to move together. Finally, the two plates 6 are pushed to move forwards, so that the mould 4 is clamped. When the mold 4 needs to be opened, the thrust block 8 is pulled backwards by the push-pull rod 12, and the two plates 6 are driven to open by the connecting rod component.
In the production and design links of the injection molding machine, the injection molding machine is faster and more stable, and more energy conservation is always the target pursued by each large injection molding machine company. For a three-plate injection molding machine, the motion speed and the energy consumption are related to the friction performance between connecting rod parts, the friction performance between the connecting rod parts depends on the thickness of an oil film between a copper sleeve and the connecting rod parts, the copper sleeve is a connecting part between adjacent connecting rods or between the connecting rod parts and the injection molding parts, and after the thickness of the oil film is reduced, the lubricating performance can be greatly reduced, so that the energy consumption is increased, the mold opening and closing period is prolonged, the stability of the machine is reduced, and the oil film is very difficult to detect because the thickness of the oil film is very small and the oil film is positioned in a sealing space between the inner side of the connecting rod part and the outer side of the copper sleeve.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that the oil film thickness is difficult to detect because the oil film thickness is very small and the oil film is positioned in a sealing space between the inner side of the connecting rod and the outer side of the copper bush, the utility model provides a device for detecting the thickness of the oil film in an injection molding machine, wherein the injection molding machine comprises a connecting rod part and an injection molding part; the connecting rod part is connected with the injection molding part through a joint part consisting of a pin shaft and a copper sleeve; the copper bush is clamped in the connecting rod part, and an oil film is formed between the outer side of the copper bush and the inner side of the connecting rod part; the detection device includes:
a detection sensor provided on the link member at a predetermined distance from the outside of the oil film;
and the detection module is used for acquiring the thickness of an oil film between the outer side of the copper sleeve and the inner side of the connecting rod part according to the emission signal sent by the detection sensor.
Further, the detection module specifically includes:
the receiving unit is used for sending a transmitting signal through the detection sensor and receiving a first reflected wave generated after the transmitting signal is subjected to first reflection on an interface between the inner side of the connecting rod part and the oil film and a second reflected wave generated after the residual energy of the transmitting signal is subjected to second reflection on an interface between the oil film and the outer side of the copper sleeve after the transmitting signal is subjected to the first reflection;
the timing unit is used for acquiring the receiving time length corresponding to the first reflected wave and the second reflected wave received by the detection sensor;
and the calculating unit is used for acquiring the thickness of an oil film between the outer side of the copper sleeve and the inner side of the connecting rod component according to the receiving time corresponding to the first reflected wave and the second reflected wave and the transmission speed of the transmitted signal.
Furthermore, the injection molding part comprises two plates, a tail plate and a push-pull rod movably arranged on the tail plate, and the two plates are movably arranged on one side of the tail plate;
the connecting rod component is positioned between the two plates and the tail plate, the connecting rod component comprises a thrust seat fixed at one end of the push-pull rod and two connecting rod assemblies which are symmetrical about the central axis of the push-pull rod, and each connecting rod assembly comprises a front connecting rod, a small connecting rod and a rear connecting rod;
one end of the front connecting rod is rotatably connected with the two plates through a joint part, the other end of the front connecting rod is rotatably connected with one end of the rear connecting rod through a joint part, and one end of the rear connecting rod, which is far away from the front connecting rod, is rotatably connected with the tail plate through a joint part; one end of the small connecting rod is rotatably connected with the rear connecting rod through a joint part, and the end of the small connecting rod, which is far away from the rear connecting rod, is rotatably connected with the thrust seat through the joint part;
and the oil film thickness of each joint component is obtained through detection sensors which are arranged in one-to-one correspondence with the joint components.
Further, the specific setting mode of the detection sensor is as follows:
punching a hole in the connecting rod part which is away from the outer side of the oil film by a preset distance, and installing a detection sensor in the hole;
the detection sensor is an ultrasonic sensor, and the preset distance is an arbitrary value within a range of 3-5 mm.
Compared with the prior art, the utility model discloses contain following beneficial effect at least:
(1) The utility model discloses a set up the detection sensor that joint part corresponds on the connecting rod part apart from the preset distance in the oil film outside, send the firing signal through detecting sensor, and receive the first back wave that the firing signal produced after taking place the first reflection at connecting rod part inboard and oil film interface, and the second back wave that its residual energy of firing signal produced after taking place the second reflection at oil film and copper sheathing outside interface after the first reflection, in order to acquire the length of receiving that detection sensor received first back wave and second back wave and correspond, and acquire the oil film thickness between joint part corresponding copper sheathing outside and connecting rod part inboard according to receiving length of time, it has been solved because oil film thickness is very little, and the oil film is located the confined space between connecting rod part inboard and the copper sheathing outside, consequently, the problem very difficult to the detection of oil film thickness;
(2) The utility model discloses after detecting oil film thickness, still include: judging whether the thickness of an oil film between the outer side of the copper sleeve and the inner side of the connecting rod part is smaller than the standard oil film thickness or not, if so, sending a lubricating signal through a preset controller to inject oil into the copper sleeve, and avoiding the problems of great reduction of lubricating performance, increase of operating energy consumption of an injection molding machine, increase of mold opening and closing period and reduction of machine stability caused by incapability of detecting the thickness of the oil film after the thickness of the oil film is reduced;
(3) The utility model discloses a punch on the connecting rod part apart from the oil film outside default distance to install non-contact's ultrasonic sensor in the hole, acquire the oil film thickness between the copper sheathing outside and the connecting rod part inboard through ultrasonic sensor, its mounting structure is reliable and simple, and measurement accuracy is high, and in time carries out the oiling to the copper sheathing through the oil film thickness that measures, very big improvement the stability of machine operation and injection moulding product's performance.
Drawings
FIG. 1 is a flow chart of a method for detecting the thickness of an oil film in an injection molding machine;
FIG. 2 is a block diagram of an apparatus for detecting the thickness of an oil film in an injection molding machine;
FIG. 3 is a view showing an installation structure of a detection sensor in the three-plate injection molding machine;
FIG. 4 is a partial enlarged view of portion A of FIG. 3;
FIG. 5 is a signal reflection diagram of the detection sensor after emitting the emission signal;
fig. 6 is a structural view of a three-plate injection molding machine.
In the figure: 1. an injection part; 2. locking the nut; 3. a head plate; 4. a mold; 5. a pull rod; 6. a second plate; 7. a front link; 8. a thrust seat; 9. a small connecting rod; 10. a rear connecting rod; 11. a tail plate; 12. a push-pull rod; 13. a joint component; 14. a front link; 15. a pin shaft; 16. a copper sleeve; 17. an oil film; 18. an aperture; 19. and detecting the sensor.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Example one
In order to avoid the problems that the lubricating performance of the injection molding machine is greatly reduced, the operating energy consumption of the injection molding machine is increased, the mold opening and closing period is prolonged and the stability of the machine is reduced due to the fact that the oil film thickness cannot be detected after the oil film thickness is reduced, as shown in figure 1, the utility model provides a method for detecting the thickness of the oil film in the injection molding machine, wherein the injection molding machine comprises a connecting rod part and an injection molding part; the connecting rod part is connected with the injection molding part through a joint part consisting of a pin shaft and a copper sleeve; the copper bush is clamped in the connecting rod part, and an oil film is formed between the outer side of the copper bush and the inner side of the connecting rod part; the detection method comprises the following steps:
s1, arranging a detection sensor corresponding to a joint component on a connecting rod component which is away from the outer side of an oil film by a preset distance;
the step S1 specifically comprises the following steps:
punching a hole in the connecting rod part which is away from the outer side of the oil film by a preset distance, and installing a detection sensor in the hole;
specifically, the hole is punched at a position a predetermined distance from the outer wall of the oil film (the predetermined distance is an arbitrary value in the range of 3 to 5 mm).
The detection sensor is an ultrasonic sensor; the propagation speed of the transmitting signal is the propagation speed of the ultrasonic wave.
S2, as shown in figure 5, sending out a transmitting signal T by the detection sensor 1 And receive the transmission signal T 1 A first reflected wave r generated after the first reflection is generated at the interface between the inner side of the connecting rod component and the oil film 1 And a transmission signal T 1 Its residual energy T after the first reflection 2 A second reflected wave r generated after a second reflection is generated at the interface between the oil film and the outer side of the copper sleeve 2 (ii) a Residual energy T after second reflection 3 And continuing to enter along the copper sleeve.
S3: acquiring the receiving time length corresponding to the first reflected wave and the second reflected wave received by the detection sensor;
the present embodiment adopts time domain analysis:
and S4, acquiring the thickness of an oil film between the outer side of the copper sleeve corresponding to the joint component and the inner side of the connecting rod component according to the receiving duration corresponding to the first reflected wave and the second reflected wave and the transmission speed of the transmitted signal.
The formula for obtaining the thickness of the oil film between the outer side of the copper sleeve and the inner side of the connecting rod part in the step S4 is as follows:
h＝(t r2 -t r1 )*v；
in the formula, r 1 Representing the first reflected wave, t r1 Indicating a reception time period during which the detection sensor receives the first reflected wave; r is 2 Representing the second reflected wave, t r2 Indicating a reception time period during which the detection sensor receives the second reflected wave; v represents the propagation velocity of the ultrasonic wave; h represents the oil film thickness between the outside of the copper bush and the inside of the link member.
After the step S4, the method further includes:
and judging whether the thickness of the oil film between the outer side of the copper bush and the inner side of the connecting rod part is smaller than the standard oil film thickness, if so, sending a lubricating signal through a preset controller so as to inject oil into the copper bush.
The utility model discloses after detecting oil film thickness, still include: judging whether the thickness of an oil film between the outer side of the copper bush and the inner side of the connecting rod part is smaller than the standard oil film thickness or not, if so, sending a lubricating signal through a preset controller to inject oil into the copper bush, and avoiding the problems that after the thickness of the oil film is reduced, the lubricating performance is greatly reduced, the operation energy consumption of an injection molding machine is increased, the mold opening and closing period is prolonged, and the stability of the machine is reduced due to the fact that the thickness of the oil film cannot be detected.
The injection molding part comprises two plates 6, a tail plate 11 and a push-pull rod 12 movably arranged on the tail plate, wherein the two plates 6 are movably arranged on one side of the tail plate 11;
the connecting rod component is positioned between the two plates 6 and the tail plate 11, and comprises a thrust seat 8 fixed at one end of the push-pull rod 12 and two connecting rod assemblies which are symmetrical about the central axis of the push-pull rod, wherein each connecting rod assembly comprises a front connecting rod 7, a small connecting rod 9 and a rear connecting rod 10;
one end of the front connecting rod 7 is rotatably connected with the two plates 6 through a joint part, the other end of the front connecting rod 7 is rotatably connected with one end of the rear connecting rod 10 through a joint part, and one end of the rear connecting rod 10 far away from the front connecting rod 7 is rotatably connected with the tail plate 11 through a joint part; one end of the small connecting rod 9 is rotatably connected with the rear connecting rod 10 through a joint part, and one end of the small connecting rod 9, far away from the rear connecting rod 10, is rotatably connected with the thrust seat 8 through the joint part;
specifically, one end of the front connecting rod 7 is rotatably hinged to the two plates 6 through a pin 15 and a copper sleeve 16, the other end of the front connecting rod 7 is rotatably hinged to one end of the rear connecting rod 10 through a pin 15 and a copper sleeve 16, and one end of the rear connecting rod 10, which is far away from the front connecting rod 7, is rotatably hinged to the tail plate 11 through a pin 15 and a copper sleeve 16; one end of the small connecting rod 9 is rotatably hinged with the rear connecting rod 10 through a pin 15 and a copper sleeve 16, and one end of the small connecting rod 9, far away from the rear connecting rod 10, is rotatably hinged with the thrust seat 8 through the pin 15 and the copper sleeve 16;
the oil film thickness of each joint component is acquired by the detection sensors 19 provided in one-to-one correspondence with the joint components.
As shown in fig. 4, the front link 14 is taken as an example, the front link 14 rotates axially around the pin 15, and during the rotation, because a layer of oil film exists between the outer side of the copper sleeve 16 and the inner side of the front link 14, the friction resistance is small when the front link 14 rotates. However, as the machine moves repeatedly, the lubricating oil at the corresponding joint part is worn and consumed, so that the oil film at the joint part needs to be detected, oil is injected in time under the condition that the oil film 17 is too thin, and the lubricating oil is supplemented, so that the problems that the lubricating performance of the injection molding machine is greatly reduced, the operating energy consumption of the injection molding machine is increased, the mold opening and closing period is prolonged, and the stability of the machine is reduced due to the fact that the oil film cannot be detected to inject oil in time after the thickness of the oil film is reduced are solved.
The utility model discloses a set up the detection sensor that joint part corresponds on the connecting rod part apart from the oil film outside default distance, send emission signal through detection sensor, and receive emission signal and take place the first back wave that produces after the first reflection at connecting rod part inboard and oil film interface, and the second back wave that its residual energy produced after the second reflection takes place at oil film and copper sheathing outside interface after the first reflection, it is long when the receipt that corresponds with the second back wave is received in order to acquire detection sensor, and it corresponds the oil film thickness between the copper sheathing outside and the connecting rod part inboard according to receiving long time acquisition joint part, it has been solved because oil film thickness is very little, and the oil film is located the confined space between the connecting rod part inboard and the copper sheathing outside, consequently, the problem of very difficult to the detection of oil film thickness.
Example two
In order to better understand the idea of the utility model, the present embodiment explains the utility model in the form of a device, as shown in fig. 2 and 3, the utility model also provides a device for detecting the thickness of an oil film in an injection molding machine, wherein the injection molding machine comprises a connecting rod component and an injection molding component; the connecting rod part is connected with the injection molding part through a joint part consisting of a pin shaft and a copper sleeve; the copper bush is clamped in the connecting rod part, and an oil film is formed between the outer side of the copper bush and the inner side of the connecting rod part; the detection device includes:
a detection sensor provided on the link member at a predetermined distance from the outside of the oil film;
the specific setting mode of the detection sensor is as follows:
punching a hole in the connecting rod part which is away from the outer side of the oil film by a preset distance, and installing a detection sensor in the hole;
the detection sensor is an ultrasonic sensor, and the preset distance is an arbitrary value within the range of 3-5 mm.
And the detection module is used for acquiring the thickness of an oil film between the outer side of the copper sleeve and the inner side of the connecting rod part according to the emission signal sent by the detection sensor.
The detection module specifically comprises:
the receiving unit is used for sending a transmitting signal through the detection sensor and receiving a first reflected wave generated after the transmitting signal is subjected to first reflection on an interface between the inner side of the connecting rod part and the oil film and a second reflected wave generated after the residual energy of the transmitting signal is subjected to second reflection on an interface between the oil film and the outer side of the copper sleeve after the transmitting signal is subjected to the first reflection;
the timing unit is used for acquiring the receiving time length corresponding to the first reflected wave and the second reflected wave received by the detection sensor;
and the calculating unit is used for acquiring the thickness of an oil film between the outer side of the copper sleeve and the inner side of the connecting rod component according to the receiving time corresponding to the first reflected wave and the second reflected wave and the transmission speed of the transmitted signal.
The injection molding part comprises two plates 6, a tail plate 11 and a push-pull rod 12 movably arranged on the tail plate, wherein the two plates 6 are movably arranged on one side of the tail plate 11;
the connecting rod component is positioned between the two plates 6 and the tail plate 11, the connecting rod component comprises a thrust seat 8 fixed at one end of the push-pull rod 12 and two connecting rod assemblies which are symmetrical about the central axis of the push-pull rod, and each connecting rod assembly comprises a front connecting rod 7, a small connecting rod 9 and a rear connecting rod 10;
one end of the front connecting rod 7 is rotatably connected with the two plates 6 through a joint part, the other end of the front connecting rod 7 is rotatably connected with one end of the rear connecting rod 10 through a joint part, and one end of the rear connecting rod 10 far away from the front connecting rod 7 is rotatably connected with the tail plate 11 through a joint part; one end of the small connecting rod 9 is rotatably connected with the rear connecting rod 10 through a joint part, and one end of the small connecting rod 9, far away from the rear connecting rod 10, is rotatably connected with the thrust seat 8 through the joint part;
specifically, one end of the front connecting rod 7 is rotatably hinged to the two plates 6 through a pin 15 and a copper sleeve 16, the other end of the front connecting rod 7 is rotatably hinged to one end of the rear connecting rod 10 through a pin 15 and a copper sleeve 16, and one end of the rear connecting rod 10, which is far away from the front connecting rod 7, is rotatably hinged to the tail plate 11 through a pin 15 and a copper sleeve 16; one end of the small connecting rod 9 is rotatably hinged with the rear connecting rod 10 through a pin 15 and a copper sleeve 16, and one end of the small connecting rod 9, far away from the rear connecting rod 10, is rotatably hinged with the thrust seat 8 through the pin 15 and the copper sleeve 16;
the oil film thickness of each joint component is acquired by the detection sensors 19 provided in one-to-one correspondence with the joint components.
According to the embodiment, the connecting rod part with the preset distance away from the outer side of the oil film is punched under the condition that the structure of the connecting rod part and the copper sleeve is not damaged, the non-contact ultrasonic sensor is installed in the hole, the thickness of the oil film between the outer side of the copper sleeve and the inner side of the connecting rod part is obtained through the time length of receiving a return signal by the ultrasonic sensor, the installation structure is simple and easy to operate, the measurement precision is high, the copper sleeve is timely filled with oil through the measured thickness of the oil film, and the operation stability of a machine and the performance of an injection molding product are greatly improved.
EXAMPLE III
Based on frequency domain analysis, the utility model also provides a detection method of oil film state in injection molding machine, be applied to embodiment 2 detection device, the oil film state includes the oil film inefficacy state, detection method includes the step:
s1, sending out an excitation signal with a preset wavelength through a detection sensor; when the thickness of the oil film is standard, the excitation signal with the preset wavelength is completely absorbed;
according to the principle, whether the oil film state is invalid or not can be judged under the condition that the thickness of the oil film is standard thickness and the excitation signal sent by the detection sensor is completely absorbed (namely, when the thickness of the oil film is standard thickness, reflected waves cannot be generated).
S2, judging whether a first reflected wave generated after the excitation signal with a preset wavelength is reflected for the first time at the interface between the inner side of the connecting rod part and the oil film or a second reflected wave generated after the residual energy of the emission signal is reflected for the second time at the interface between the oil film and the outer side of the copper sleeve after the first reflection is received; and if so, indicating that the oil film state corresponding to the current joint component is a failure state.
Through the utility model discloses a detection method, whether can be simple and quick detect out the oil film and lose efficacy, avoided when oil film thickness reduces the back, owing to can not detect out the oil film state with timely oiling, and the injection molding machine lubricating property that leads to reduces by a wide margin, injection molding machine operation energy consumption risees, the problem that the mould cycle that opens and shuts increases and machine stability reduces.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Furthermore, the descriptions of the embodiments as "first," "second," "a," etc. in this disclosure are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of the indicated features is indicative. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "secured" are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Claims (4)
1. The device for detecting the thickness of the oil film in the injection molding machine is characterized in that the injection molding machine comprises a connecting rod part and an injection molding part; the connecting rod part is connected with the injection molding part through a joint part consisting of a pin shaft and a copper sleeve; the copper bush is clamped in the connecting rod part, and an oil film is formed between the outer side of the copper bush and the inner side of the connecting rod part; the detection device includes:
a detection sensor provided on the link member at a predetermined distance from the outside of the oil film;
and the detection module is used for acquiring the thickness of an oil film between the outer side of the copper sleeve and the inner side of the connecting rod part according to the emission signal sent by the detection sensor.
2. The apparatus of claim 1, wherein the detection module comprises:
the receiving unit is used for sending a transmitting signal through the detection sensor and receiving a first reflected wave generated after the transmitting signal is subjected to first reflection on an interface between the inner side of the connecting rod part and the oil film and a second reflected wave generated after the residual energy of the transmitting signal is subjected to second reflection on an interface between the oil film and the outer side of the copper sleeve after the transmitting signal is subjected to the first reflection;
the timing unit is used for acquiring the receiving time length corresponding to the first reflected wave and the second reflected wave received by the detection sensor;
and the calculation unit is used for acquiring the thickness of an oil film between the outer side of the copper sleeve and the inner side of the connecting rod component according to the receiving duration corresponding to the first reflected wave and the second reflected wave and the transmission speed of the transmitted signal.
3. The apparatus of claim 1, wherein the injection molding component comprises two plates, a tail plate and a push-pull rod movably disposed on the tail plate, the two plates being movably disposed on one side of the tail plate;
the connecting rod component is positioned between the two plates and the tail plate, the connecting rod component comprises a thrust seat fixed at one end of the push-pull rod and two connecting rod assemblies which are symmetrical about the central axis of the push-pull rod, and each connecting rod assembly comprises a front connecting rod, a small connecting rod and a rear connecting rod;
one end of the front connecting rod is rotatably connected with the two plates through a joint part, the other end of the front connecting rod is rotatably connected with one end of the rear connecting rod through a joint part, and one end of the rear connecting rod, which is far away from the front connecting rod, is rotatably connected with the tail plate through a joint part; one end of the small connecting rod is rotatably connected with the rear connecting rod through a joint part, and the end of the small connecting rod, which is far away from the rear connecting rod, is rotatably connected with the thrust seat through the joint part;
and the oil film thickness of each joint component is obtained through detection sensors which are arranged in one-to-one correspondence with the joint components.
4. The apparatus for detecting the thickness of an oil film in an injection molding machine according to claim 1, wherein the detection sensor is specifically disposed in a manner that:
punching a hole in the connecting rod part which is away from the outer side of the oil film by a preset distance, and installing a detection sensor in the hole;
the detection sensor is an ultrasonic sensor, and the preset distance is an arbitrary value within a range of 3-5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221460256.7U CN217900785U (en) | 2022-06-13 | 2022-06-13 | Detection apparatus for oil film thickness in injection molding machine |
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| CN202221460256.7U CN217900785U (en) | 2022-06-13 | 2022-06-13 | Detection apparatus for oil film thickness in injection molding machine |
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