CN217032427U - Measuring device for measuring axial float gap of throttle shaft - Google Patents

Abstract

The utility model provides a measuring device for measuring an axial float gap of a throttle shaft, wherein the throttle shaft is arranged in a throttle body, the measuring device comprises a fixing mechanism for fixing the throttle body, a displacement sensor for measuring the axial float distance of the throttle shaft, a first driving mechanism for driving the displacement sensor to move, a second ejection mechanism for pushing the throttle shaft to move and a control mechanism for receiving feedback information of the displacement sensor and controlling the fixing mechanism, the first driving mechanism and the second ejection mechanism to operate, and the displacement sensor and the second ejection mechanism are respectively positioned at two ends of the throttle shaft. The utility model solves the problems that the working efficiency is low, the reliability of manual detection is low and the numerical value of the axial float clearance of the throttle shaft cannot be obtained in the mode of manually detecting the axial float clearance of the throttle shaft through sound in the prior art.

Description

Measuring device for measuring axial float gap of throttle shaft

Technical Field

The utility model relates to the technical field of throttle bodies, in particular to a measuring device for measuring an axial float gap of a throttle shaft.

Background

The throttle shaft in the existing throttle body needs to axially float, but the measurement of the amplitude of the axial float of the throttle shaft (namely the size of the axial float gap of the throttle shaft) is difficult, whether the amplitude of the axial float of the throttle shaft is qualified or not can be judged only by the sound emitted by special inspectors when the throttle shaft floats, the mode that the axial float gap of the throttle shaft is detected by the sound is adopted by the manpower, the working efficiency is low, the reliability of manual detection is low, and the numerical value of the axial float gap of the throttle shaft cannot be obtained.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a measuring device for measuring the axial float clearance of a throttle shaft, which mainly solves the problems in the prior art that the working efficiency is low, the reliability of manual detection is low and the numerical value of the axial float clearance of the throttle shaft cannot be obtained by a mode of manually detecting the axial float clearance of the throttle shaft through sound.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: a measuring device for measuring the axial float clearance of a throttle shaft, which is mounted in a throttle body, characterized in that: the measuring device comprises a fixing mechanism for fixing the throttle valve body, a displacement sensor for measuring the axial movement distance of the throttle valve shaft, a first driving mechanism for driving the displacement sensor to move, a second ejection mechanism for pushing the throttle valve shaft to move and a control mechanism for receiving feedback information of the displacement sensor and controlling the fixing mechanism, the first driving mechanism and the second ejection mechanism to operate, wherein the displacement sensor and the second ejection mechanism are respectively positioned at two ends of the throttle valve shaft.

Further, fixed establishment includes the bottom plate, is equipped with the supporting part on the bottom plate, and the supporting part top is equipped with the third cylinder, and the expansion end of third cylinder bottom is connected and is compressed tightly the portion, and supporting part and portion of compressing tightly are used for pressing from both sides tight throttle body.

Furthermore, first actuating mechanism includes first cylinder, and displacement sensor is connected to the expansion end of first cylinder, and displacement sensor's measuring end is towards the one end of throttle shaft.

Furthermore, the first cylinder is fixed at one end of the bottom plate, and a sliding rail is arranged on the bottom plate between the first cylinder and the supporting part; the movable end of the first air cylinder is connected with a first fixed seat, the bottom of the first fixed seat is provided with a sliding block, and the sliding block is matched with the sliding rail;

the displacement sensor is arranged at one end of the first fixed seat.

Further, the measuring device also comprises a protection mechanism for protecting the displacement sensor.

Furthermore, the protection mechanism comprises a second fixed seat, a transmission rod, a first locking part, a second locking part and an elastic part, the second fixed seat is concave, the protruding parts at the two ends are a first connecting part and a second connecting part, the first connecting part is close to the throttle shaft, the second connecting part is close to the displacement sensor, the transmission rod penetrates through the first connecting part and the second connecting part, one end of the transmission rod is connected with or abutted to the measuring end of the displacement sensor, and the other end of the transmission rod faces one end of the throttle shaft;

the two sides of the transmission rod, which are positioned at the first connecting part, are respectively provided with a locking ring, the locking ring positioned outside the second fixed seat is a first locking ring, and the locking ring positioned in the second fixed seat is a second locking ring;

the second connecting part is connected with or abutted against one end of the elastic part, and the second locking ring is connected with or abutted against the other end of the elastic part;

the second fixing seat is arranged at the other end of the first fixing seat.

Furthermore, the second ejection mechanism comprises a second cylinder, the movable end of the second cylinder is an ejection cylinder head, and the ejection cylinder corresponds to the other end of the throttle shaft

Further, the second cylinder may be movably disposed on the other end of the base plate.

Furthermore, the second cylinder is arranged on a second support plate, the second support plate is connected with a second sliding plate, and the second sliding plate is movably connected with the bottom plate.

Furthermore, the ejection cylinder head, the throttle shaft and the transmission rod are all arranged on the same axis;

and/or the third cylinder is arranged on the bottom plate through a third bracket;

and/or the first cylinder is arranged at one end of the bottom plate through a cylinder fixing plate;

and/or the supporting part is provided with a positioning pin for positioning the throttle body;

and/or the pressing part is a pressing plate;

and/or the displacement sensor is connected to one end of the first fixed seat through a fourth fixed plate;

and/or the first locking part is a first locking ring, and the second locking part is a second locking ring;

and/or the elastic part is a spring;

and/or the clearance distance between the first locking part and the second locking part is smaller than the maximum stroke of the displacement sensor.

In view of the technical characteristics, the utility model has the following beneficial effects:

1. according to the measuring device for measuring the axial float clearance of the throttle shaft, the displacement value of the axial float of the throttle shaft is accurately measured through the displacement sensor, the numerical value of the axial float clearance of the throttle shaft is calculated through the control mechanism (PLC), and the numerical value of the axial float clearance is accurate and high in reliability.

2. The measuring device for measuring the axial float clearance of the throttle shaft realizes semi-automatic operation, the fixing mechanism is controlled by the control mechanism to fix the throttle body, the first cylinder pushes the displacement sensor to move, the second cylinder pushes the throttle shaft to move, the displacement sensor is helped to measure displacement values twice, in the whole process, an operator only needs to complete upper and lower operations (the requirement on the operator is not high), the operation is simple, and other parts (including the first cylinder, the second cylinder and the third cylinder) are controlled by the control mechanism to finally complete the measurement of the axial float clearance of the throttle shaft by the displacement sensor, so that the semi-automatic operation is realized, the measuring efficiency of the axial float clearance of the throttle shaft can be improved, and the working efficiency is improved.

Drawings

Fig. 1 is a front view 1 of a measuring device for measuring an axial running clearance of a throttle shaft in embodiment 1.

Fig. 2 is a perspective view 1 of a measuring device for measuring an axial running clearance of a throttle shaft according to embodiment 1.

Fig. 3 is a perspective view (with a portion of the third bracket removed) of a measuring device for measuring an axial running clearance of a throttle shaft according to embodiment 1.

Fig. 4 is a perspective view 3 (with the throttle body removed, showing a pilot pin) of a measuring device for measuring an axial running clearance of a throttle shaft in embodiment 1.

Fig. 5 is a perspective view of a throttle body in embodiment 1.

Fig. 6 is a perspective view of the throttle body in embodiment 1.

Fig. 7 is a schematic structural diagram of the connection between the second fixing base and the displacement sensor in embodiment 1.

In the figure:

1. a base plate; 1-1, sliding rails; 1-2, a support part; 1-2-1, positioning pins;

2. a first cylinder; 2-1, a first fixing plate; 2-2, a first fixed seat; 2-3, a sliding block;

3. a displacement sensor; 3-1, a fourth fixing plate;

4. a second fixed seat; 4-1, a first connection portion; 4-2, a second connecting part;

5. a transmission rod; 5-1, a first locking portion; 5-2, a second locking part;

6. an elastic portion;

7. a second cylinder; 7-1, ejecting out a cylinder head; 7-2, a second support plate; 7-3, a second sliding plate; 7-3-1, a waist-shaped hole;

8. a third cylinder; 8-1, a pressing part; 8-2, a third bracket;

9. a throttle body; 9-1 and a throttle shaft.

Detailed Description

The utility model will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Referring to fig. 1 to 7, embodiment 1 provides a measuring device for measuring an axial float gap of a throttle shaft, where the throttle shaft 9-1 is installed in a throttle body 9, the measuring device includes a fixing mechanism for fixing the throttle body 9, a displacement sensor 3 for measuring an axial float distance of the throttle shaft 9-1, a first driving mechanism for driving the displacement sensor 3 to move, a second ejecting mechanism for pushing the throttle shaft 9-1 to move, and a control mechanism for receiving feedback information from the displacement sensor 3 and controlling the fixing mechanism, the first driving mechanism, and the second ejecting mechanism, and the displacement sensor 3 and the second ejecting mechanism are respectively located at two ends of the throttle shaft 9-1.

The fixing mechanism comprises a bottom plate 1, wherein a supporting part 1-2 (such as a supporting block) is arranged on the bottom plate 1 and used for placing a throttle body 9; the fixing mechanism further comprises a third air cylinder 8, the third air cylinder 8 is connected to the bottom plate 1 through a third support 8-2, the movable end of the bottom of the third air cylinder 8 is connected with a pressing part 8-1 (such as a pressing plate), the pressing plate is driven by the third air cylinder 8 to move in the vertical direction and is used for being matched with the supporting part 1-2 to press and fix the throttle body 9, that is, the supporting part 1-2 and the pressing part 8-1 are used for clamping the throttle body 9, the supporting part 1-2 presses the throttle body 9 to avoid position change of the throttle body 9 in the vertical direction, meanwhile, the throttle body 9 is fixed on the supporting part 1-2 through a positioning pin 1-2-1 (for example, two positioning pins 1-2-1 are adopted and are matched with positioning holes on the throttle body, the positioning holes are not shown in the attached figures), the position change of the throttle body 9 in the horizontal direction is avoided, namely the throttle body 9 is pressed on the supporting part 1-2, the position movement in any direction cannot occur, so that the situation that the throttle shaft 9-1, the second ejection mechanism and the displacement sensor 3 are not aligned due to the position movement of the throttle body 9 can be effectively avoided, and the supporting part 1-2 is located under the pressing plate. The pressure plate is preferably a square pressure plate, the area is large, the pressure plate can be stably pressed on the throttle valve body 9, the throttle valve body 9 can be stably clamped between the pressure plate and the supporting portion 1-2, the throttle valve body 9 is ensured not to shake or move at any position in the process of measuring the axial moving gap of the throttle shaft 9-1, and the accuracy of measuring the axial moving gap of the throttle shaft 9-1 is ensured.

The third cylinder 8 is provided with a magnetic ring and a magnetic switch, the magnetic switch senses the moving position of the pressing plate through the magnetic ring and feeds the moving position back to the control mechanism, the control mechanism judges whether the pressing plate tightly presses the throttle body 9 (namely whether the throttle body 9 is tightly clamped between the pressing plate and the supporting part 1-2, so that the subsequent measurement of the axial float gap of the throttle shaft 9-1 is facilitated), if so, the control mechanism controls the third cylinder 8 to stop running, the throttle body 9 is prevented from being damaged by pressing, and the accurate control of the movement of the pressing plate is realized.

The first driving mechanism comprises a first cylinder 2, the first cylinder 2 is arranged at one end of a bottom plate 1 (for example, the first cylinder 2 is arranged at the right end of the bottom plate 1 through a first fixing plate 2-1), a slide rail 1-1 is arranged on the bottom plate 1 between the first cylinder 2 and a supporting part 1-2, the movable end of the first cylinder 2 is connected with a first fixed seat 2-2, the bottom of the first fixed seat 2-2 is provided with a slide block 2-3, the slide block 2-3 is matched with the slide rail 1-1, one end of the first fixed seat 2-2 (for example, the right end of the first fixed seat 2-2) is fixed with a displacement sensor 3 (namely, the measuring end of the displacement sensor 3 faces one end of an air throttle shaft 9-1, for example, the right end of the air throttle shaft 9-1), the first fixed seat 2-2 realizes the sliding of the first fixed seat 2-2 through the slide block 2-3 under the driving of the movable end of the first cylinder 2, that is to say, the first fixed seat 2-2 drives the displacement sensor 3 to move along the slide rail 1-1, so that the displacement sensor 3 is close to or far away from one end of the throttle shaft 9-1 of the throttle body 9. The first fixed seat 2-2 is flat. In addition, the design of the sliding block 2-3 and the sliding rail 1-1 can also effectively ensure that the transmission rod 5 moves linearly towards one end of the throttle shaft 9-1 (namely the right end of the throttle shaft 9-1), ensure that the other end of the transmission rod 5 (namely the left end of the transmission rod 5) can finally abut against one end of the throttle shaft 9-1 (namely the right end of the throttle shaft 9-1), and the throttle shaft 9-1 and the transmission rod 5 are positioned on the same straight line, so that the accuracy of the displacement sensor 3 for measuring the play gap of the throttle shaft 9-1 through the transmission rod 5 is improved.

The measuring device further comprises a protection mechanism for protecting the displacement sensor 3. The protection mechanism comprises a second fixed seat 4, a transmission rod 5, a first locking part 5-1, a second locking part 5-2 and an elastic part 6 (such as a spring).

The second fixing seat 4 is arranged at the other end of the first fixing seat 2-2 (for example, the left end of the first fixing seat 2-2), the second fixing seat 4 comprises a first connecting portion 4-1 and a second connecting portion 4-2, the two connecting portions and the bottom of the second fixing seat 4 jointly form a hollow space, the hollow space is used for accommodating an elastic portion 6 (for example, a spring), the transmission rod 5 penetrates through the two connecting portions, meanwhile, the elastic portion 6 is sleeved on the transmission rod 5, one end of the transmission rod 5 (for example, the right end of the transmission rod 5) penetrates through the two connecting portions and then is connected with or abutted against the displacement sensor 3, and the other end of the transmission rod 5 (for example, the left end of the transmission rod 5) is used for abutting against one end of the throttle shaft 9-1.

In this embodiment 1, preferably, the second fixing seat 4 is concave, and the protruding portions at two ends correspond to two connecting portions, one of the protruding portions is a first connecting portion 4-1, the first connecting portion 4-1 is close to the throttle body 9, the other protruding portion is a second connecting portion 4-2, and the second connecting portion 4-2 is close to the displacement sensor 3.

The transmission rod 5 is provided with a locking part (such as a locking ring) at each of two sides of the first connecting part 4-1, for example, the transmission rod 5 is provided with a first locking ring (i.e. a first locking part 5-1) corresponding to a position between the first connecting part 4-1 and the throttle body 9 (i.e. a position of the transmission rod 5 on the outer side surface of the first connecting part 4-1), the transmission rod 5 is provided with a second locking ring (i.e. a second locking part 5-2) corresponding to a position between the first connecting part 4-1 and the second connecting part 4-2, the spring is sleeved on the transmission rod 5 between the second locking ring and the second connecting part 4-2, one end of the spring (e.g. the right end of the spring) is connected with the inner side wall of the second connecting part 4-2, the other end of the spring (e.g. the left end of the spring) is connected with the second locking ring, and the second locking ring is used for adjusting the initial pressure of the spring, the initial pressure is an initial pressure generated by the second lock ring to the spring when the driving rod 5 contacts the throttle shaft 9 and the throttle shaft 9 generates a first displacement value X1 to the displacement sensor 3 indirectly after the driving rod 5 and the driving rod 5 are pushed by the first cylinder 2 to move toward the throttle body 9, and the second lock ring adjusts or controls the initial pressure to protect the displacement sensor 3.

In addition, in the above-mentioned process, first cylinder 2 promotes displacement sensor 3 and transfer line 5 and produces an effort to throttle body 9 when moving, and after transfer line 5 and throttle shaft 9 contacted, with the help of second lock ring cooperation spring, can effectively reduce because of first cylinder 2 promotes the indirect effort size that leads to transfer line 5 to throttle shaft 9 or effectively control the effort size of spring to transfer line 5, its the indirect effort size of control transfer line 5 to displacement sensor 3 that just in fact, avoids haring displacement sensor 3.

The first locking ring serves to limit the distance over which the transmission rod 5 can be moved in the direction of the displacement sensor 3, protecting the displacement sensor 3. Because the throttle shaft 9-1 is driven by the ejector cylinder head 7-1 of the second cylinder 7, if the moving distance of the push transmission rod 5 is greater than the upper limit of the displacement sensor 3 (for example, in the case that the throttle shaft 9-1 is too far apart due to no C-shaped check ring or tolerance matching), the displacement sensor 3 is easily damaged, and therefore, the first check ring is very necessary to effectively protect the displacement sensor 3.

Preferably, the clearance distance between the first locking portion 5-1 and the second locking portion 5-2 is smaller than the maximum stroke of the displacement sensor 3, and the clearance distance between the first locking portion 5-1 and the second locking portion 5-2 actually limits the movable distance of the transmission rod 5 relative to the displacement sensor 3, so as to protect the displacement sensor 3 from being damaged due to the fact that the transmission rod 5 moves too far relative to the displacement sensor 3 to exceed the maximum stroke of the displacement sensor 3.

Preferably, the displacement sensor 3 is fixedly connected to the first fixing seat 2-2 through a fourth fixing plate 3-1, and the fourth fixing plate 3-1 helps the sensing portion of the displacement sensor 3 to be connected to or abutted against one end of the transmission rod 5 (for example, the right end of the transmission rod 5).

Preferably, the second ejection mechanism comprises a second cylinder 7, the second cylinder 7 is fixed on the bottom plate 1, for example, the second cylinder 7 is an ejection cylinder, a movable end (also called an ejection cylinder head 7-1) of the second cylinder 7 corresponds to the other end of the throttle shaft 9-1 (for example, the left end of the throttle shaft 9-1), and the second cylinder 7 is used for pushing the throttle shaft 9-1 to move towards the position sensor, so as to facilitate the measurement of the value of the position moving distance of the throttle shaft 9-1 in cooperation with the position sensor.

Preferably, the second cylinder 7 is arranged on the second support plate 7-2, the second support plate 7-2 is connected with the second sliding plate 7-3, the second sliding plate 7-3 is movably connected with the base plate 1, for example, a waist-shaped hole 7-3-1 is arranged on the second sliding plate 7-3, a screw hole is arranged on the base plate 1 corresponding to the second sliding plate 7-3, the second sliding plate 7-3 is movably connected or fixed with the base plate 1 through a bolt, the waist-shaped hole 7-3-1 and the screw hole, therefore, the distance between the second cylinder 7 and the throttle body 9 can be adjusted, and the requirement for measuring the running distance of the throttle shaft 9-1 of different types of throttle bodies 9 (or measuring the axial clearance between the throttle shaft 9-1 of different throttle bodies 9 and the C-shaped retainer) is met.

Preferably, the support portion 1-2 is further provided with a positioning pin 1-2-1 for positioning the throttle body 9, so that the throttle body 9 can be conveniently and quickly placed at a designated position (for example, directly below the pressure plate).

In addition, the supporting part 1-2 also has a certain height, which can help the throttle shaft 9-1 of the throttle body 9 to be positioned on the same axis with the ejection cylinder head 7-1 and the transmission rod 5.

In the normal state (i.e. when the transmission rod 5 is not against the throttle shaft 9-1), the spring can be in the extended state and the second locking ring is close to the inner side wall of the first connecting portion 4-1, or the spring can be in a compressed state and presses the second locking ring on the inner side wall of the first connecting portion 4-1 (the spring increases the pushing force on the transmission rod 5, for example, the elastic force of the spring is greater than the friction force between the throttle shaft 9-1 and the throttle body 9, so as to help the transmission rod 5 to better push the throttle shaft 9-1 to move, and simultaneously, the pressure of the transmission rod 5 on displacement sensing can be effectively buffered, so that the displacement sensor 3 is protected, at this time, the displacement sensor 3 is also in contact with one end of the transmission rod 5 (for example, the right end of the transmission rod 5) but does not generate pressure, and the displacement measurement is not performed on the displacement sensor 3 (that is, the measurement end of the displacement sensor 3 does not measure the position movement of the transmission rod 5).

When the throttle valve body 9 is placed on the supporting part 1-2, two ends of the throttle valve shaft 9-1 respectively correspond to the transmission rod 5 and the ejection cylinder head 7-1 of the second cylinder 7, the control mechanism (namely PLC) controls the third cylinder 8 to operate, the pressing plate at the bottom of the third cylinder 8 moves downwards until the pressing plate presses and fixes the throttle valve body 9 on the supporting part 1-2, and the control mechanism controls the third cylinder 8 to stop operating;

then, when the first cylinder 2 (controlled by the control mechanism) drives the first fixing base 2-2 to move towards the supporting portion 1-2, the first fixing base 2-2 drives the fourth fixing plate 3-1, the displacement sensor 3 and the second fixing base 4 to synchronously move towards the throttle body 9, the second connecting portion 4-2 of the second fixing base 4 compresses one end of the spring (i.e. the right end of the spring), the spring pushes the transmission rod 5 to move through the second locking ring, i.e. the transmission rod 5 and the displacement sensor 3 are indirectly synchronously moved, the relative positions of the two do not change until the other end (e.g. the left end of the transmission rod 5) of the transmission rod 5 is abutted against one end (e.g. the right end of the throttle shaft 9-1) of the throttle shaft 9-1, the transmission rod 5 pushes the throttle shaft 9-1 to continuously move in the same direction, until the throttle shaft 9-1 stops moving, the transmission rod 5 cannot move continuously, at the moment, the first cylinder 2 still drives the first fixed seat 2-2, the second fixed seat 4 and the displacement sensor 3 to move continuously in the same direction, the transmission rod 5 compresses the measuring end of the displacement sensor 3, the displacement sensor 3 measures a first displacement value X1 and feeds the first displacement value X1 back to the control mechanism, the transmission rod 5 synchronously compresses the spring through the second locking ring or further compresses the spring, and the control mechanism controls the first cylinder 2 to stop running. The first displacement value X1 is not the throttle shaft running clearance, and is a signal for controlling the first cylinder 2 to stop running by the control mechanism, so as to help the control mechanism to more accurately control the first cylinder 2 to stop running, and the first displacement value X1 can also be used as a starting point value for measuring the throttle shaft running clearance;

then, the control mechanism controls the second cylinder 7 to operate, the ejection cylinder head 7-1 of the second cylinder 7 extends out and butts against the other end of the throttle shaft 9-1 (namely, the left end of the throttle shaft 9-1), then the throttle shaft 9-1 is continuously pushed towards the displacement sensor 3 in the same direction of movement (at this time, the pushing force of the ejection cylinder head 7-1 is larger than the elastic force of the spring), at this time, the throttle shaft 9-1 and the transmission rod 5 synchronously move, the transmission rod 5 further compresses the measuring end of the displacement sensor 3 until the throttle shaft 9-1 stops moving, the transmission rod 5 cannot move, at this time, the displacement sensor 3 measures a second displacement value X2, and a second displacement value X2 is fed back to the control mechanism, and the control mechanism subtracts a difference X3 (namely, X2-X1 is equal to X3) obtained by subtracting the first displacement value X1 from the second displacement value X2, the difference X3 is the value of the float gap of the throttle shaft 9-1 (i.e. the displacement value for the float of the throttle shaft 9-1), if the difference X3 is within the standard range (including the end point value), the float gap of the throttle shaft 9-1 is qualified, if the difference X3 is outside the standard range, the float gap of the throttle shaft 9-1 is unqualified.

After the measurement is finished, the control mechanism controls the first cylinder 2 to drive the transmission rod 5 and the displacement sensor 3 to recover the original position, the second cylinder 7 to drive the ejection cylinder head 7-1 to recover the original position, and the third cylinder 8 to drive the pressing plate to recover the original position, at the moment, the throttle body 9 can be taken down, and meanwhile, the second locking ring 5-2 can drive the transmission rod 5 to recover the original position under the elastic force action of the spring 6, so that the next measurement is facilitated.

The whole operation process realizes semi-automation, can accurately measure the air throttle shaft 9-1 play clearance, is convenient for effectively controlling the product quality, improves the inspection efficiency and accuracy of whether the product is qualified or not, and greatly saves the labor cost.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A measuring device for measuring an axial float gap of a throttle shaft, said throttle shaft (9-1) being mounted in a throttle body (9), characterized in that: the measuring device comprises a fixing mechanism for fixing a throttle valve body (9), a displacement sensor (3) for measuring the axial movement distance of a throttle valve shaft (9-1), a first driving mechanism for driving the displacement sensor (3) to move, a second ejection mechanism for pushing the throttle valve shaft (9-1) to move and a control mechanism for receiving feedback information of the displacement sensor (3) and controlling the fixing mechanism, the first driving mechanism and the second ejection mechanism to operate, wherein the displacement sensor (3) and the second ejection mechanism are respectively positioned at two ends of the throttle valve shaft (9-1).

2. The measuring device of claim 1, wherein the measuring device is configured to measure an axial play gap of the throttle shaft, and further comprises: the fixing mechanism comprises a bottom plate (1), a supporting portion (1-2) is arranged on the bottom plate (1), a third cylinder (8) is arranged above the supporting portion (1-2), the movable end of the bottom of the third cylinder (8) is connected with a pressing portion (8-1), and the supporting portion (1-2) and the pressing portion (8-1) are used for clamping a throttle body (9).

3. The measuring device of claim 2, wherein the measuring device is configured to measure an axial play gap of the throttle shaft, and further comprises: the first driving mechanism comprises a first cylinder (2), the movable end of the first cylinder (2) is connected with a displacement sensor (3), and the measuring end of the displacement sensor (3) faces one end of a throttle shaft (9-1).

4. A measuring device for measuring the axial play gap of a throttle shaft as set forth in claim 3, wherein: the first cylinder (2) is fixed at one end of the bottom plate (1), and a sliding rail (1-1) is arranged on the bottom plate (1) between the first cylinder (2) and the supporting part (1-2); the movable end of the first cylinder (2) is connected with a first fixed seat (2-2), a sliding block (2-3) is arranged at the bottom of the first fixed seat (2-2), and the sliding block (2-3) is matched with the sliding rail (1-1);

the displacement sensor (3) is arranged at one end of the first fixed seat (2-2).

5. The measuring device of claim 4 for measuring an axial float gap of a throttle shaft, wherein: the measuring device also comprises a protection mechanism for protecting the displacement sensor (3).

6. The measuring device for measuring the axial float gap of the throttle shaft as set forth in claim 5, wherein: the protection mechanism comprises a second fixed seat (4), a transmission rod (5), a first locking part (5-1), a second locking part (5-2) and an elastic part (6), the second fixed seat (4) is concave, protruding parts at two ends are a first connecting part (4-1) and a second connecting part (4-2), the first connecting part (4-1) is close to the throttle shaft (9-1), the second connecting part (4-2) is close to the displacement sensor (3), the transmission rod (5) penetrates through the first connecting part (4-1) and the second connecting part (4-2), one end of the transmission rod (5) is connected with or abutted against the measuring end of the displacement sensor (3), and the other end of the transmission rod (5) faces one end of the throttle shaft (9-1);

the two sides of the transmission rod (5) positioned at the first connecting part (4-1) are respectively provided with a locking part, the locking part positioned outside the second fixed seat (4) is a first locking part (5-1), and the locking part positioned in the second fixed seat (4) is a second locking part (5-2);

the second connecting part (4-2) is connected with or abutted against one end of the elastic part (6), and the second locking part (5-2) is connected with or abutted against the other end of the elastic part (6);

the second fixed seat (4) is arranged at the other end of the first fixed seat (2-2).

7. The measuring device for measuring the axial float gap of the throttle shaft as set forth in claim 6, wherein: the second ejection mechanism comprises a second air cylinder (7), the movable end of the second air cylinder (7) is an ejection air cylinder head (7-1), and the ejection air cylinder corresponds to the other end of the throttle shaft (9-1).

8. The measuring device of claim 7, wherein the measuring device is configured to measure an axial play gap of the throttle shaft, and further comprises: the second air cylinder (7) is movably arranged at the other end of the bottom plate (1).

9. The measuring device for measuring the axial float gap of the throttle shaft as set forth in claim 8, wherein: the second cylinder (7) is arranged on the second support plate (7-2), the second support plate (7-2) is connected with the second sliding plate (7-3), and the second sliding plate (7-3) is movably connected with the bottom plate (1).

10. The measuring device of claim 9, wherein the measuring device is configured to measure an axial play gap of the throttle shaft, and further comprising: the ejection cylinder head (7-1), the throttle valve shaft (9-1) and the transmission rod (5) are all arranged on the same axis;

and/or the third cylinder (8) is arranged on the bottom plate (1) through a third bracket (8-2);

and/or the first cylinder (2) is arranged at one end of the bottom plate (1) through a first fixing plate (2-1);

and/or a positioning pin (1-2-1) for positioning the throttle body (9) is arranged on the supporting part (1-2);

and/or the pressing part (8-1) is a pressing plate;

and/or the displacement sensor (3) is connected to one end of the first fixed seat (2-2) through a fourth fixed plate (3-1);

and/or the first locking part (5-1) is a first locking ring, and the second locking part (5-2) is a second locking ring;

and/or the elastic part (6) is a spring;

and/or the clearance distance between the first locking part (5-1) and the second locking part (5-2) is smaller than the maximum stroke of the displacement sensor (3).

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