A device for measuring the inner diameter of a high-power cylinder liner

Abstract

The utility model discloses a kind of inner diameter measuring devices of high-power cylinder sleeve, comprising: back-shaped base, its top middle place is fixedly connected with the center tube of top end as plugging structure;PLC controller, fixedly installed on back-shaped base top inner wall.This utility model is by being provided with a series of structures, it is convenient to from inside to outside to the above and below two rows of high-power cylinder sleeve eight-point accurate control pressure bracing, realize adaptive to high-power cylinder sleeve bracing positioning and automatically positioning centering work, without additionally separately to high-power cylinder sleeve centering, and avoid the phenomenon that too small pressure leads to ineffective bracing positioning or too large pressure leads to deformation damage, it is convenient to apply to the bracing work of the safety of high-power cylinder sleeve of different thickness, improve applicability, and can be integrated automatically measured and displayed radius when automatically bracing positioning and centering, so that personnel simple calculation knows its inside diameter, realize the effect of conveniently accurate and fast measurement of the inner diameter of the large size of high-power cylinder sleeve.

Description

Technical Field

[0001] This utility model relates to the field of cylinder liner inner diameter detection technology, specifically to a device for measuring the inner diameter of a high-power cylinder liner. Background Technology

[0002] Traditional methods involve measuring with calipers or plug gauges. Calipers are insufficient for the high-precision measurement requirements of large-diameter cylinder liners commonly used in high-power applications, as their large size and length make them difficult to handle horizontally and smoothly. Plug gauges can only check for compliance, not accurately measure the cylinder bore diameter. Currently, cylinder liner inner diameter measurements utilize micrometers, dial indicators, and ultrasonic equipment. Using micrometers and dial indicators is cumbersome, inaccurate, and requires a high level of manual skill. Ultrasonic measurement requires specialized equipment, operators, and measuring tubes, resulting in high costs. However, a utility model with publication number CN203116721U discloses a device for measuring the inner diameter of engine cylinder liners. During measurement, a cylinder is inserted into the cylinder liner, compressing a displacement sensor. The cylinder liner inner diameter is calculated based on the sensor reading. This device has a simple structure, high measurement accuracy, and allows for online detection. However, it has the following shortcomings in use: its structure is not reasonable enough, and it lacks an automatic positioning and centering mechanism during the measurement process, making it difficult to accurately and stably find the center of the cylinder liner, which makes it difficult to quickly and accurately measure the inner diameter of large-diameter, high-power cylinder liners; in view of this, this application proposes an inner diameter measuring device for high-power cylinder liners to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of this invention is to provide a device for measuring the inner diameter of a high-power cylinder liner, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an inner diameter measuring device for a high-power cylinder liner, comprising: A U-shaped base, with a central tube at the top center fixedly connected to a sealing structure at the top; The PLC controller is fixedly installed on the inner wall of the top of the U-shaped base, and a pressure display and a distance display are fixedly and electrically connected to its bottom; There are eight horizontal guide rods, which are fixed in pairs on the four sides of the central tube. Support rods are slidably sleeved on the horizontal guide rods, and support wheels are rotatably installed on the end of the support rods away from the central tube. The threaded drive pressure measuring assembly consists of four sets, which are respectively installed on the four sides of the central tube and on the outside of the corresponding two support rods, and are electrically connected to the PLC controller. A rotary drive assembly is rotatably mounted on the top of a U-shaped base and fixedly connected to four threaded drive pressure testing assemblies. A drive motor with an output shaft fixedly connected to the rotary drive assembly is fixedly installed on the inner bottom wall of the U-shaped base. The drive motor is electrically connected to a PLC controller. The rotary drive assembly drives the four threaded drive pressure testing assemblies to synchronously expand outward or contract inward when the drive motor starts. The four threaded drive pressure testing assemblies drive eight support rods to synchronously expand outward or contract inward, using the eight support rods to drive eight support wheels simultaneously. The machine moves outward or inward, and uses eight support wheels to move outward synchronously to achieve eight-point tensioning of the high-power cylinder liner from the inside out. Four threaded drive pressure measuring components are also used to detect the extrusion pressure during tensioning and transmit it to the PLC controller. When the pressure value reaches the preset value, the PLC controller controls the drive motor to automatically shut down, achieving the effect of eight-point safety pressure control tensioning of the upper and lower rows. The upper and lower rows of eight-point tensioning achieve automatic adaptive tensioning and vertical positioning of the high-power cylinder liner, so that its center point is automatically aligned with the center point of the central tube. The ranging component is fixedly connected to the top of the center tube and the top left side of the support rod, and is electrically connected to the PLC controller. The ranging component is used to detect the radius of the high-power cylinder liner during tensioning and transmit it to the PLC controller. The PLC controller controls the distance display to show the distance value. Using a diameter that is twice the radius, personnel can directly determine the inner diameter based on this radius distance value.

[0005] Preferably, the linkage rotary drive assembly includes a first bevel gear, four second bevel gears and a rotating shaft. The rotating shaft is rotatably fitted into the top of the U-shaped base, and the bottom end of the rotating shaft extends into the U-shaped base and is fixedly connected to the top end of the output shaft of the drive motor. The first bevel gear is fixedly connected to the top end of the rotating shaft, and the four second bevel gears mesh in a ring at equal intervals on the outside of the first bevel gear. Two opposite second bevel gears are symmetrically arranged.

[0006] Preferably, the threaded pressure testing assembly includes a screw, a moving rod, a pressure sensor, and a connecting rod. The four screws are rotatably mounted on the top of the four sides of the central tube. The ends of the four screws that are close to each other extend into the central tube and are fixedly connected to the corresponding second bevel gears. The moving rod is slidably sleeved on the two corresponding support rods. The connecting rod is fixedly connected between the two corresponding support rods. The moving rod is threaded onto the corresponding screw. The pressure sensor is fixedly connected between the corresponding moving rod and the connecting rod. The connecting rod is located on the side of the moving rod away from the central tube. All four pressure sensors are electrically connected to the PLC controller.

[0007] Preferably, the ranging assembly includes a laser ranging sensor and a reference plate. The laser ranging sensor is fixedly connected to the right side of the top of the central tube, and the reference plate is fixedly connected to the left side of the top of the support rod in the upper left corner. The distance between the laser ranging sensor and the reference plate is the same as the distance between the center point of the central tube and the outermost side of the support wheel. The laser ranging sensor is electrically connected to the PLC controller.

[0008] Preferably, one side of the movable rod has a threaded hole that is threaded to the corresponding screw, and one side of the connecting rod has a circular through hole. The screw is located in the corresponding circular through hole and does not contact the inner wall of the circular through hole.

[0009] Preferably, the end of the support rod near the central tube has a horizontal guide groove that slides and fits with the outer side of the corresponding horizontal guide rod.

[0010] Preferably, a lithium battery is fixedly installed on the bottom inner wall of the U-shaped base, and the drive motor, PLC controller, laser rangefinder, pressure display and distance display are all electrically connected to the lithium battery.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. Through the coordinated use of the set-in U-shaped base, central tube, PLC controller, drive motor, linkage rotary drive assembly and thread drive pressure measuring assembly, it can perform eight-point precise pressure control and tensioning of high-power cylinder liners from the inside out, with two rows of upper and lower sections. It can achieve adaptive positioning and automatic centering of high-power cylinder liner tensioning and positioning, without the need for separate centering of the high-power cylinder liner. Moreover, by using pressure control tensioning, it avoids the phenomenon of insufficient pressure leading to ineffective tensioning and positioning or excessive pressure leading to deformation and damage. It is convenient to safely tension high-power cylinder liners of different thicknesses, improving applicability. 2. By cooperating with the set PLC controller, support rod, distance measuring component and distance display, the radius can be automatically measured and displayed when the automatic tensioning and positioning is centered. This makes it convenient for personnel to know its inner diameter, and achieves the effect of convenient, accurate and fast measurement of the inner diameter of large-size high-power cylinder liners, thus improving measurement accuracy.

[0012] This utility model, through a series of structures, facilitates precise eight-point pressure control and support of high-power cylinder liners from the inside out, achieving adaptive automatic positioning and centering of the high-power cylinder liner support. It eliminates the need for separate centering of the high-power cylinder liner and avoids ineffective support and positioning due to insufficient pressure or deformation and damage due to excessive pressure. It is suitable for safe support of high-power cylinder liners of different thicknesses, improving applicability. Furthermore, it automatically measures and displays the radius during automatic support and centering, allowing personnel to easily calculate the inner diameter, thus achieving convenient, accurate, and rapid measurement of the inner diameter of large-sized high-power cylinder liners. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a high-power cylinder liner inner diameter measuring device proposed in this utility model; Figure 2 This is a top view schematic diagram of the inner diameter measuring device for a high-power cylinder liner proposed in this utility model; Figure 3 This is a front sectional view of the inner diameter measuring device for a high-power cylinder liner proposed in this utility model.

[0014] In the diagram: 1. U-shaped base; 101. PLC controller; 102. Distance display; 103. Pressure display; 2. Central tube; 201. Horizontal guide rod; 202. Support rod; 203. Support wheel; 3. Laser rangefinder sensor; 301. Reference plate; 4. Screw; 401. Moving rod; 402. Pressure sensor; 403. Connecting rod; 5. Second bevel gear; 501. First bevel gear; 502. Rotating shaft; 503. Drive motor. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] like Figures 1 to 3 As shown in the figure, the high-power cylinder liner inner diameter measuring device proposed in this embodiment includes: A U-shaped base 1, with a central tube 2 whose top end is a sealing structure fixedly connected to the middle of its top; The PLC controller 101 is fixedly installed on the inner wall of the top of the U-shaped base 1, and the pressure display 103 and the distance display 102 are fixedly connected to its bottom. There are eight horizontal guide rods 201, which are fixed in pairs on the four sides of the central tube 2. Support rods 202 are slidably sleeved on the horizontal guide rods 201. Support wheels 203 are rotatably installed on the end of the support rods 202 away from the central tube 2. The threaded drive pressure measuring assembly consists of four sets, which are respectively installed on the four sides of the central tube 2 and on the outside of the corresponding two support rods 202, and are electrically connected to the PLC controller 101. The linkage rotary drive assembly is rotatably mounted on the top of the U-shaped base 1 and fixedly connected to four threaded drive pressure testing assemblies. A drive motor 503 with its output shaft fixedly connected to the linkage rotary drive assembly is fixedly installed on the inner bottom wall of the U-shaped base 1. The drive motor 503 is electrically connected to the PLC controller 101. The linkage rotary drive assembly is used to drive the four threaded drive pressure testing assemblies to synchronously expand outward or contract inward when the drive motor 503 starts. The four threaded drive pressure testing assemblies are used to drive eight support rods 202 to synchronously expand outward or contract inward, thereby driving eight support wheels. The 203 synchronously expands outward or contracts inward, using eight support wheels 203 to expand outward synchronously to achieve eight-point tensioning of the high-power cylinder liner from the inside out. The four threaded drive pressure measuring components are also used to detect the extrusion pressure during tensioning and transmit it to the PLC controller 101. When the pressure value reaches the preset value, the PLC controller 101 controls the drive motor 503 to automatically shut down, achieving the effect of eight-point safety pressure control tensioning of the upper and lower rows. The upper and lower rows of eight-point tensioning achieve automatic adaptive tensioning and vertical positioning of the high-power cylinder liner, so that its center point is automatically aligned with the center point of the center tube 2. The distance measuring component is fixedly connected to the top of the center tube 2 and the top left side of the support rod 202, and is electrically connected to the PLC controller 101. The distance measuring component is used to detect the radius of the high-power cylinder liner during tensioning and transmit it to the PLC controller 101. The PLC controller 101 controls the distance display 102 to display the distance value. Since the diameter is twice the radius, the personnel can directly determine its inner diameter based on this radius distance value. In this embodiment, the end of the support rod 202 near the central tube 2 is provided with a transverse guide groove that slides and fits with the outer side of the corresponding transverse guide rod 201, thereby guiding the support rod 202 to slide laterally; the end of the support rod 202 away from the central tube 2 is provided with a groove with openings on both sides, and a stainless steel shaft is fixedly connected between the top inner wall and the bottom inner wall of the groove. A first bearing is fixedly fitted inside the support wheel 203, and the inner ring of the first bearing is fixedly fitted with the outer side of the stainless steel shaft.

[0017] Furthermore, such as Figure 3 As shown, the linkage rotary drive assembly includes a first bevel gear 501, four second bevel gears 5 and a rotating shaft 502. The rotating shaft 502 is rotatably fitted into the top of the U-shaped base 1. The bottom end of the rotating shaft 502 extends into the U-shaped base 1 and is fixedly connected to the top end of the output shaft of the drive motor 503. The first bevel gear 501 is fixedly connected to the top end of the rotating shaft 502. The four second bevel gears 5 mesh in a ring at equal intervals on the outside of the first bevel gear 501. Two opposite second bevel gears 5 are symmetrically arranged. In this embodiment, a circular through hole is provided on the top of the U-shaped base 1, and a second bearing is fixedly sleeved in the circular through hole. The inner ring of the second bearing is fixedly sleeved with the outer side of the rotating shaft 502, so as to achieve the effect of rotating and installing the rotating shaft 502. In this embodiment, the first bevel gear 501, four second bevel gears 5, and a rotating shaft 502 work together. The drive motor 503 drives the first bevel gear 501 to rotate through the rotating shaft 502. The first bevel gear 501 drives the four second bevel gears 5 to rotate. Since the two opposite second bevel gears 5 are symmetrically arranged, the two opposite second bevel gears 5 rotate in opposite directions.

[0018] Furthermore, such as Figure 1 , 2 As shown in Figure 3, the threaded drive pressure measuring assembly includes a screw 4, a moving rod 401, a pressure sensor 402, and a connecting rod 403. The four screws 4 are rotatably mounted on the top of the four sides of the central tube 2. The ends of the four screws 4 that are close to each other extend into the central tube 2 and are fixedly connected to the corresponding second bevel gear 5. The moving rod 401 is slidably sleeved on the corresponding two support rods 202. The connecting rod 403 is fixedly connected between the corresponding two support rods 202. The moving rod 401 is threadedly sleeved on the corresponding screw 4. The pressure sensor 402 is fixedly connected between the corresponding moving rod 401 and the connecting rod 403. The connecting rod 403 is located on the side of the moving rod 401 away from the central tube 2. All four pressure sensors 402 are electrically connected to the PLC controller 101. In this embodiment, a threaded hole is provided on one side of the movable rod 401, which is threaded to the corresponding screw 4. A circular through hole is provided on one side of the connecting rod 403. The screw 4 is located in the corresponding circular through hole and does not contact the inner wall of the circular through hole. The threaded connection between the screw 4 and the threaded hole facilitates the lateral displacement of the movable rod 401 when the screw 4 rotates. The circular through hole allows the corresponding screw 4 to pass through. Circular through holes are provided on all four sides of the central tube 2. A third bearing is fixedly fitted inside the circular through hole. The inner ring of the third bearing is fixedly connected to the outer side of the screw 4, which facilitates the rotational installation of the screw 4. Two transverse guide holes are provided on one side of the movable rod 401, which are respectively slidably fitted to the outer side of the corresponding support rod 202, thus guiding the lateral sliding of the movable rod 401. In this embodiment, the screws 4, moving rods 401, pressure sensors 402, and connecting rods 403 work together. The PLC controller 101 pre-sets the closing pressure value of the drive motor 503 according to the tensioning requirements of high-power cylinder liners of different thicknesses. The rotation of the four second bevel gears 5 drives the four screws 4 to rotate. Since the rotation directions of two opposite second bevel gears 5 are opposite, the rotation directions of two opposite screws 4 are also opposite. The rotation of the four screws 4 drives the four moving rods 401 to synchronously expand or contract in a repulsive manner. The four moving rods 401, via four pressure sensors 402, drive the four connecting rods 403 to move outwards or inwards synchronously. The four connecting rods 403 then drive the eight support rods 202 to move outwards or inwards synchronously. The eight support rods 202 then drive the eight support wheels 203 to move outwards or inwards synchronously. When the eight support wheels 203 move outwards synchronously, they provide eight-point tensioning support to the high-power cylinder liner from the inside out. In this tensioned state, the support wheels 203 are supported by the inner wall of the high-power cylinder liner. The obstruction restricts the movement of the support rod 202 and connecting rod 403. At this time, the four pressure sensors 402 detect the applied pressure as the corresponding support rod 202 continues to move outward, converting it into a standard electrical signal and transmitting it to the PLC controller 101. The PLC controller 101 converts the received standard electrical signal into an actual pressure value via analog-to-digital conversion and transmits it to the pressure display 103 for display, allowing personnel to clearly observe and understand the pressure value. When the preset pressure value is reached, the PLC controller 101 controls the drive motor 503 to shut down, thus achieving... The eight support wheels 203 drive the high-power cylinder liner from the inside out, using two rows of eight precise pressure-controlled supports. The eight-point supports in the upper and lower rows enable automatic self-adaptive support and vertical positioning of the high-power cylinder liner, automatically aligning its center point with the center point of the central tube 2. Furthermore, the pressure-controlled support method avoids the phenomenon of insufficient pressure leading to ineffective support and positioning or excessive pressure leading to deformation and damage. It also prevents the failure of a single pressure sensor 402 from affecting the overall pressure control operation, ensuring the stability of the pressure-controlled support.

[0019] Furthermore, such as Figure 1 , 2As shown in Figure 3, the ranging assembly includes a laser ranging sensor 3 and a reference plate 301. The laser ranging sensor 3 is fixedly connected to the right side of the top of the central tube 2, and the reference plate 301 is fixedly connected to the left side of the top of the support rod 202 in the upper left corner. The distance between the laser ranging sensor 3 and the reference plate 301 is the same as the distance between the center point of the central tube 2 and the outermost edge of the support wheel 203. The laser ranging sensor 3 is electrically connected to the PLC controller 101. In this embodiment, through the cooperation of the laser ranging sensor 3 and the reference plate 301, when the support rod 202 in the upper left corner moves outward, it drives the reference plate 301 to move outward. During external relocation, the laser rangefinder 3 detects the distance between itself and the reference plate 301, converts it into a standard electrical signal, and transmits it to the PLC controller 101. The PLC controller 101 converts the received standard electrical signal into an actual distance value through analog-to-digital conversion and transmits it to the distance display 102 for display. Since the distance between the laser rangefinder 3 and the reference plate 301 is the same as the distance between the center point of the central tube 2 and the outermost edge of the support wheel 203, this distance value is the radius of the high-power cylinder liner. Since the diameter is twice the radius, personnel can directly determine its inner diameter based on this radius distance value.

[0020] Furthermore, a lithium battery is fixedly installed on the bottom inner wall of the U-shaped base 1, and the drive motor 503, PLC controller 101, laser range sensor 3, pressure display 103 and distance display 102 are all electrically connected to the lithium battery.

[0021] It should be noted that the lithium battery preferably uses the Lunqu Technology P760S model lithium battery with integrated charge and discharge protection function. This model of lithium battery can safely power the drive motor 503, PLC controller 101, laser rangefinder 3, pressure display 103, and distance display 102. The PLC controller 101 preferably uses a Siemens S7-200SMART programmable controller with integrated analog input module, which can receive the standard electrical signal output by the pressure sensor 402 and convert it into the actual pressure value through integrated analog-to-digital conversion function. The pressure sensor 402 preferably uses a Transcell BSS series plate (pressure) load cell. This device is used for sampling and measuring the inner diameter of high-power cylinder liners and does not need to be used for a long time, so the lithium battery meets its usage requirements. Furthermore, the electrical connection between the drive motor 503 and the PLC controller 101 is achieved through wires and a servo driver. The preferred servo driver is a Siemens V90 servo driver, a common driver for motors and electric actuators used with Siemens programmable controllers, meeting the direct control requirements of the programmable controller over the drive motor 503. The other four pressure sensors 402, pressure display 103, and distance display 102 are all electrically connected to the PLC controller 101 via flexible wires. Given that the pressure sensor 402 is a moving component, the connecting flexible wires are designed with a certain length of bend to accommodate its movement. This method of establishing an electrical connection to the PLC controller 101 via direct wire connection is a mature and well-known technology for conventional wired controller control, and will not be elaborated further here. Regarding power supply, given that the cylinder liner processing and testing site is a machining site with sufficient power supply measures and conditions, all electrical components of this device are connected to the local mains power supply. They are connected to the power input interfaces of each device through conventional power distribution devices such as circuit breakers, contactors, and power modules (not marked in the figure) to form a complete power supply circuit. This power supply scheme is a conventional power distribution method for industrial equipment and is a mature and well-known technical means, so it will not be described in detail here.

[0022] The usage method of this embodiment is as follows: When using the high-power cylinder liner inner diameter measuring device, the high-power cylinder liner is placed downwards on the outside of the eight support wheels 203. The closing pressure value of the control drive motor 503 is preset using the PLC controller 101 according to the support requirements of high-power cylinder liners of different thicknesses. The operator starts the drive motor 503 in the forward direction, causing it to drive the first bevel gear 501 to rotate via the rotating shaft 502. The first bevel gear 501 drives the four second bevel gears 5 to rotate. Since the two opposite second bevel gears 5 are symmetrically arranged, their rotation directions are opposite. The four second bevel gears 5... The rotation drives four screws 4 to rotate, which in turn drives four moving rods 401 to move synchronously and repulsively. These moving rods 401, through four pressure sensors 402, drive four connecting rods 403 to move synchronously outward. The connecting rods 403 then drive eight support rods 202 to move synchronously outward. These eight support rods 202, in turn, drive eight support wheels 203 to move synchronously outward. As the eight support wheels 203 move synchronously outward, they provide eight-point tensioning support to the high-power cylinder liner from the inside out. In this tensioned state, the support wheels 203 are restricted by the inner wall of the high-power cylinder liner, thus causing the support rods 20... 2. When the connecting rod 403 is blocked and restricted, the four pressure sensors 402 detect the compressive force applied when the corresponding support rod 202 continues to move outward, convert it into a standard electrical signal and transmit it to the PLC controller 101. The PLC controller 101 converts the received standard electrical signal into an actual pressure value through analog-to-digital conversion and transmits it to the pressure display 103 for display, so that personnel can clearly observe and understand the pressure value. When the preset pressure value is reached, the PLC controller 101 controls the drive motor 503 to shut down, realizing the effect of driving the eight support wheels 203 from the inside out to provide eight-point precise pressure control and support for the high-power cylinder liner in two rows. The lower two rows of eight-point supports achieve automatic adaptive support and vertical positioning of the high-power cylinder liner, automatically aligning its center point with the center point of the central tube 2, achieving automatic positioning and centering without the need for separate centering of the high-power cylinder liner. Furthermore, the pressure-controlled support method avoids ineffective support and positioning due to insufficient pressure or deformation and damage due to excessive pressure. The multi-point pressure-controlled support method also prevents the failure of a single pressure sensor (402) from affecting the overall pressure control operation, ensuring the stability of the pressure-controlled support. The safe pressure-controlled support method facilitates safe support of high-power cylinder liners of different thicknesses, improving applicability. When the support rod 202 in the upper left moves outward, it drives the reference plate 301 to move outward as well. The laser range sensor 3 detects the distance between itself and the reference plate 301, converts it into a standard electrical signal, and transmits it to the PLC controller 101. The PLC controller 101 converts the received standard electrical signal into an actual distance value through analog-to-digital conversion and transmits it to the distance display 102 for display. Since the distance between the laser range sensor 3 and the reference plate 301 is the same as the distance between the center point of the central tube 2 and the outermost edge of the support wheel 203, this distance value is the radius of the high-power cylinder liner. Twice the radius, personnel can directly determine the inner diameter based on this radius distance value, achieving the effect of automatic measurement and display of the radius when the automatic support is centered, thus making it easy for personnel to know the inner diameter. This achieves the effect of convenient, accurate and fast measurement of the inner diameter of large-sized high-power cylinder liners, improving measurement accuracy. When it is necessary to release the support state, the reverse start drive motor 503 is started, which is completely opposite to the movement direction of the forward start drive motor 503 mentioned above. At this time, the eight support wheels 203 change to retract and move back inward, releasing the support state, and the high-power cylinder liner can be removed for replacement.

[0023] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for measuring the internal diameter of a large power cylinder liner, comprising a back-shaped base (1), characterized in that: include: A U-shaped base (1) has a central tube (2) with a sealing structure at the top center fixedly connected to its top; The PLC controller (101) is fixedly installed on the inner wall of the top of the U-shaped base (1), and a pressure display (103) and a distance display (102) are fixedly and electrically connected to its bottom. There are eight horizontal guide rods (201), which are fixed in pairs on the four sides of the central tube (2). A support rod (202) is slidably sleeved on the horizontal guide rod (201). A support wheel (203) is rotatably installed on the end of the support rod (202) away from the central tube (2). The thread drive pressure measuring assembly consists of four sets, which are respectively installed on the four sides of the central tube (2) and on the outside of the corresponding two support rods (202), and are electrically connected to the PLC controller (101); The linkage rotary drive assembly is rotatably embedded on the top of the spiral base (1) and fixedly connected to four threaded drive pressure measuring assemblies. The bottom inner wall of the spiral base (1) is fixedly installed with a drive motor (503) whose output shaft is fixedly connected to the linkage rotary drive assembly. The drive motor (503) is electrically connected to the PLC controller (101). The ranging component is fixedly connected to the top of the center tube (2) and the top left side of the support rod (202) on the upper left, and is electrically connected to the PLC controller (101).

2. A bore measuring device for a high duty cylinder liner as claimed in claim 1, characterised in that: The linkage rotary drive assembly includes a first bevel gear (501), four second bevel gears (5) and a rotating shaft (502). The rotating shaft (502) is rotatably fitted into the top of the U-shaped base (1). The bottom end of the rotating shaft (502) extends into the U-shaped base (1) and is fixedly connected to the top end of the output shaft of the drive motor (503). The first bevel gear (501) is fixedly connected to the top end of the rotating shaft (502). The four second bevel gears (5) mesh in a ring at equal intervals on the outside of the first bevel gear (501). The two opposite second bevel gears (5) are symmetrically arranged.

3. A bore measuring device for a high duty cylinder liner as claimed in claim 2, characterised in that: The threaded pressure measuring assembly includes a screw (4), a moving rod (401), a pressure sensor (402), and a connecting rod (403). The four screws (4) are rotatably mounted on the top of the four sides of the central tube (2). The ends of the four screws (4) that are close to each other extend into the central tube (2) and are fixedly connected to the corresponding second bevel gear (5). The moving rod (401) is slidably sleeved on the corresponding two support rods (202). The connecting rod (403) is fixedly connected between the corresponding two support rods (202). The moving rod (401) is threadedly sleeved on the corresponding screw (4). The pressure sensor (402) is fixedly connected between the corresponding moving rod (401) and the connecting rod (403). The connecting rod (403) is located on the side of the moving rod (401) away from the central tube (2). All four pressure sensors (402) are electrically connected to the PLC controller (101).

4. The bore measuring apparatus for a high power cylinder liner according to claim 1, characterized by: The ranging assembly includes a laser ranging sensor (3) and a reference plate (301). The laser ranging sensor (3) is fixedly connected to the right side of the top of the central tube (2), and the reference plate (301) is fixedly connected to the left side of the top of the support rod (202) in the upper left. The distance between the laser ranging sensor (3) and the reference plate (301) is the same as the distance between the center point of the central tube (2) and the outermost edge of the support wheel (203). The laser ranging sensor (3) is electrically connected to the PLC controller (101).

5. The inner diameter measuring device for a high-power cylinder liner according to claim 3, characterized in that: The moving rod (401) has a threaded hole on one side that is threaded to the corresponding screw (4), and the connecting rod (403) has a circular through hole on one side. The screw (4) is located in the corresponding circular through hole and does not contact the inner wall of the circular through hole.

6. The inner diameter measuring device for a high-power cylinder liner according to claim 1, characterized in that: The support rod (202) has a horizontal guide groove at one end near the center tube (2) that slides and fits on the outside of the corresponding horizontal guide rod (201).

7. The inner diameter measuring device for a high-power cylinder liner according to claim 4, characterized in that: A lithium battery is fixedly installed on the bottom inner wall of the spiral base (1). The drive motor (503), PLC controller (101), laser range sensor (3), pressure display (103) and distance display (102) are all electrically connected to the lithium battery.

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