[0027] Example 1
[0028] Such as Figure 1-2 As shown, a device for correcting the pre-tightening force between the striker and the nozzle, the device for correcting the pre-tightening force between the striker and the nozzle, is used for a piezoelectric injection valve, and the piezoelectric injection valve includes a valve body 1, The piezoelectric actuator 2 is arranged in the valve body 1, the striker 4 is slidably mounted on the valve body 1, and the nozzle 5 is located below the valve body 1. The piezoelectric actuator 2 drives the striker 4 through the lever 3 to amplify the driving force Feed to the nozzle 5. The device includes:
[0029] The first adjusting mechanism has a pre-tensioning member 8 and an upper adjusting block 9 and a lower adjusting block 10 that cooperate with each other. The pre-tensioning member 8 is limited to the side of the upper adjusting block 9 and can push the upper adjusting block from the side 9. The lower adjusting block 10 drives the piezoelectric actuator 2 to move down;
[0030] And the second adjustment mechanism has an adjustment rod 11 which is threadedly connected with the valve body 1, the bottom end of the adjustment rod 11 abuts on the upper surface of the upper adjustment block 9, and the adjustment rod 11 pushes the upper adjustment When the block 9 moves down, the lower adjusting block 10 drives the piezoelectric actuator 2 to move down.
[0031] The side of the valve body 1 is provided with a sliding hole 1-1, the upper adjusting block 9 and the lower adjusting block 10 are both arranged in the sliding hole 1-1, the lower surface of the upper adjusting block 9 and the lower adjusting block 10 is in contact with the upper surface, the lower surface of the upper adjustment block 9 and the upper surface of the lower adjustment block 10 are both inclined surfaces, the pretensioning member 8 abuts on the left side of the upper adjustment block 9, and the lower adjustment block The right side surface of 10 abuts against the bottom of the sliding hole 1-1, and the lower surface of the lower adjusting block 10 is opposite to the head end of the piezoelectric actuator 2.
[0032] The inclined surface is inclined upward from left to right.
[0033] The upper inner wall of the sliding hole 1-1 is a limit surface 1-11 for realizing the upper adjustment block 9 to the upper limit, and the lower surface of the lower adjustment block 10 is between the lower inner wall of the sliding hole 1-1 Leave a gap; so that when the upper adjustment block 9 is in contact with the limit surface 1-11 above the sliding hole 1-1, the upper adjustment block 9 can be restricted by the limit surface 1-11 and will not move upwards, thereby ensuring The second adjustment mechanism will not cause the piezoelectric actuator 2 to be too loose during adjustment.
[0034] The pretensioner 8 and the valve body 1 are threadedly connected.
[0035] The adjusting rod 11 has a step surface 11-1 for realizing a downward limit; thus, when the adjusting rod 11 is moved downward until its step surface 11-1 contacts the valve body 1, the step surface 11-1 can be The adjustment rod 11 is prevented from continuing to move downward, so as to ensure that the piezoelectric actuator 2 is not overtightened when the second adjustment mechanism is adjusted.
[0036] The valve body 1 has two clamping arms 1-2, the adjusting rod 11 is located between the two clamping arms 1-2, a locking screw 15 is provided on the side of the adjusting rod 11, and the locking The screw 15 is connected between the two clamping arms 1-2; the locking screw 15 is used to clamp the two clamping arms 1-2 to clamp the adjusting rod 11, thereby avoiding the loosening of the adjusting rod 11; specifically, in this embodiment , The threaded end of the locking screw 15 can pass through one clamp arm 1-2 and be screwed to the other clamp arm 1-2; or the threaded end of the locking screw 15 can pass through two clamp arms 1-2 at the same time , And screw a nut on the locking screw 15, and clamp the two clamping arms 1-2 with the nut and the nut of the locking screw 15.
[0037] Among them, the piezoelectric actuator 2 may be a piezoelectric ceramic component.
[0038] In order to explain the working principle of the present implementation more clearly, a detailed structure of a piezoelectric injection valve is provided, which can be specifically as follows: the striker 4 of the piezoelectric injection valve abuts against the lever 3 through the return spring 6, and the lever 3 is preloaded. The spring 7 abuts against the piezoelectric actuator 2, the lever 3 is installed in the valve body 1 through the fulcrum 12, the head end of the piezoelectric actuator 2 abuts against the lower adjustment block 10, the piezoelectric actuator 2 The tail end of the abutting on the lever 3, the distance between the contact point between the striker 4 and the lever 3 to the fulcrum 12>the distance between the contact point between the piezoelectric actuator 2 and the lever 3 and the fulcrum 12, the striker 4 is located on the lever Below 3, the piezoelectric actuator 2 is located above the lever 3, and the striker 4 and the piezoelectric actuator 2 are both located on the same side of the fulcrum 12;
[0039] A guide sleeve 13 is fixed at the bottom end of the valve body 1, the striker 4 is slidably arranged in the guide sleeve 13, the upper end of the return spring 6 abuts on the striker 4, and the lower end of the return spring 6 abuts in the valve body 1;
[0040] The pretension spring 7 is sleeved on the outside of the return spring 6, the upper end of the pretension spring 7 abuts against the lower surface of the lever 3, and the lower end of the pretension spring 7 abuts inside the valve body 1.
[0041] A runner body 14 is fixed below the valve body 1. The nozzle 5 is arranged at the bottom end of the runner body 14. The bottom end of the runner body 14 is screwed with a lock for pressing and fixing the nozzle 5 on the runner body 14. The cap 16 and the nozzle 5 are located in the locking cap 16, and the striker 4 passes through the runner body 14 and is opposite to the nozzle 5.
[0042] The working principle of this embodiment is as follows:
[0043] When assembling, the piezoelectric actuator 2 can be installed into the valve body 1 from the position of the adjusting rod 11 to provide a long enough installation space for the piezoelectric actuator 2; then the first adjusting structure is roughly adjusted and rotated The pre-tensioning member 8 makes the upper adjusting block 9 drive the lower adjusting block 10 to move down, and coarsely adjust the initial horizontal position of the lever 3 so that the striker 4 and the nozzle 5 are in just contact state, and there is no pre-tightening force between the striker 4 and the nozzle 5 ; Then the pre-tensioning part 8 is bonded to the valve body 1 with thread glue, so that the adjustment cannot be continued, and the pre-tensioning part 8 will not be loosened;
[0044] Among them, the end surface of the pre-tensioning member 8 and the end surface of the upper adjustment block 9 are relatively smooth, and the friction between the two is relatively small. Therefore, the pre-tensioning member 8 can completely restrict the left and right movement of the upper adjustment block 9, but cannot completely restrict the upper adjustment. Up and down movement of block 9;
[0045] The pretension spring 7 transmits the force to the upper adjustment block 9 through the lever 3, the piezoelectric actuator 2 and the lower adjustment block 10 in turn, that is, a transmission chain is formed between the pretension spring 7 and the upper adjustment block 9; That is to say, when the adjusting rod 11 is loosened, the lever 3, the piezoelectric actuator 2, the lower adjusting block 10 and the upper adjusting block 9 will be under the action of the pre-tensioning spring 7, so that the upper adjusting block 9 overcomes its and the pre-tensioning part. When the friction force between 8 moves upwards, the firing pin 4 also loosens accordingly, so as to reduce the pre-tightening force between the firing pin 4 and the nozzle 5; on the contrary, when the adjusting rod 11 is tightened, the upper adjusting block 9 will overcome The frictional force between it and the pre-tensioning member 8 moves downwards, and in turn drives the striker 4 to move down through the lower adjusting block 10, the piezoelectric actuator 2 and the lever 3, and the striker 4 is accordingly tightened accordingly. The pre-tightening force between the striker 4 and the nozzle 5 is increased.
[0046] When replacing the nozzle 5, after the nozzle 5 is reinstalled on the valve body 1, the pre-tightening force between the striker 4 and the nozzle 5 can be adjusted by rotating the adjustment lever 11; on this basis, the pre-tightening force between the striker 4 and the nozzle 5 The precise adjustment process of the pre-tightening force can be specifically as follows: the loosening or tightening of the adjusting rod 11 will affect the tightening force of the striker 4 and the nozzle 5, thereby affecting the tightness of the piezoelectric actuator 2, and the piezoelectric actuator Actuator 2 is connected to an external circuit. The current value of one path in the external circuit will also change accordingly. The change in current value is converted into a change in displacement, which can realize the pre-setting between the striker 4 and the nozzle 5. Precise adjustment of tightness.
