Buffering and damping mechanism for diesel generating set

Abstract

The invention discloses a buffering and damping mechanism for a diesel generating set, and relates to the technical field of diesel generating sets, the buffering and damping mechanism comprises a fixed seat, a first mounting mechanism and a second mounting mechanism, the fixed seat is provided with a bolt hole, the first mounting mechanism is arranged above the fixed seat in a matched mode, and the second mounting mechanism is arranged above the fixed seat in a matched mode. A buffering mechanism is arranged between the first mounting mechanism and the second mounting mechanism in a matched mode, the first mounting mechanism and the second mounting mechanism are arranged in parallel, a vibration detection mechanism is arranged on one side of the second mounting mechanism in a matched mode, and the vibration detection mechanism comprises a connecting block arranged on one side of the second mounting mechanism. An adjusting assembly is fixedly connected to the side, away from the second mounting mechanism, of the connecting block, a first guide plate and a second guide plate are arranged on the side, close to the adjusting assembly, of the first mounting mechanism, and a contact plate is arranged at the lower end of the adjusting assembly. According to the invention, the operation state of the diesel generating set and the implementation state of the buffer mechanism can be monitored.

Description

Technical Field

[0001] The invention relates to the technical field of diesel generator sets, and in particular to a buffer shock absorbing mechanism for a diesel generator set. Background Art

[0002] A diesel generator set is a device that uses diesel as fuel to generate electricity through the principle of an internal combustion engine. Its core consists of two parts: a diesel generator set and a generator. A diesel generator set generates mechanical energy by burning diesel to drive the rotor of the generator to rotate, and the stator of the generator generates alternating current when the rotor rotates.

[0003] During the operation of a diesel generator set, the explosion of fuel in the combustion chamber, the reciprocating motion of the piston, and the rotation of the crankshaft will all generate vibrations. To reduce vibrations, professional shock absorbers can be installed, that is, multiple sets of shock absorbers are used to support the diesel generator set to isolate and reduce vibration transmission. Shock absorbers usually contain elastic components or shock absorbing components, and their main function is to absorb and alleviate the vibrations generated by the diesel generator set during operation. However, with long-term use, these components may experience elastic fatigue or even deformation, resulting in them being unable to effectively support the diesel generator set together, which may cause the engine to shift. In addition, this damage will also accelerate the loss of other shock absorbers, increase overall maintenance costs and potential failure risks. Therefore, if the shock absorber is found to be damaged, it needs to be replaced quickly to reduce the impact on the diesel generator set and other normal shock absorbers.

[0004] In the existing technical solution, since the diesel generator set is heavy and difficult to carry, and the shock absorber is arranged at the bottom of the diesel generator set, it becomes difficult for the staff to perform disassembly and installation operations when faced with a damaged shock absorber. Summary of the invention

[0005] The purpose of the present invention is to provide a buffer shock absorbing mechanism for a diesel generator set, which solves the problem that the diesel generator set is heavy and difficult to carry, which makes it difficult for workers to disassemble and maintain the damaged shock absorber.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A buffer shock absorbing mechanism for a diesel generator set comprises a fixing seat, wherein the fixing seat is provided with a bolt hole, the device further comprises a first mounting mechanism and a second mounting mechanism, the first mounting mechanism is cooperatively arranged above the fixing seat, a buffer mechanism is cooperatively arranged between the first mounting mechanism and the second mounting mechanism, the first mounting mechanism is arranged in parallel with the second mounting mechanism, a vibration detection mechanism is cooperatively arranged on one side of the second mounting mechanism, the vibration detection mechanism comprises a connecting block arranged on one side of the second mounting mechanism, an adjusting component is fixedly connected to the connecting block on a side away from the second mounting mechanism, a first guide plate and a second guide plate are arranged on a side of the first mounting mechanism close to the adjusting component, a contact plate is arranged at the lower end of the adjusting component, the first guide plate and the second guide plate are respectively parallelly arranged on the upper side and the lower side of the contact plate, the contact plate, the first guide plate and the second guide plate are all made of conductive materials, the contact plate is electrically connected to a power supply device, and the first guide plate and the second guide plate are respectively electrically connected to a voltage sensor.

[0008] As a further solution of the present invention: the buffer mechanism includes a lower connecting plate that cooperates with the first mounting mechanism, a lower guide sleeve is fixedly connected to the lower connecting plate, a shock absorbing assembly is arranged on the top of the lower connecting plate, an upper connecting plate is arranged on the top of the shock absorbing assembly, and an upper guide sleeve is fixedly connected to the upper connecting plate and slidably cooperates with the lower guide sleeve.

[0009] As a further solution of the present invention: the shock absorbing assembly includes a damper arranged between the lower connecting plate and the upper connecting plate, and a spring matching with the upper connecting plate and the lower connecting plate is sleeved on the outer side of the damper.

[0010] As a further solution of the present invention: the first mounting mechanism includes a base plate, which is cooperatively arranged above the fixed seat, and the base plate is fixedly connected with a lower positioning seat that matches the lower connecting plate; the second mounting mechanism includes a top plate, and the bottom of the top plate is fixedly connected with an upper positioning seat that matches the upper connecting plate; the lower positioning seat and the lower connecting plate, and the upper positioning seat and the upper connecting plate are fixedly connected by bolts.

[0011] As a further solution of the present invention: a hydraulic telescopic rod is fixedly connected to the bottom plate, and an extended end of the hydraulic telescopic rod is fixedly connected to a support plate matched with the top plate.

[0012] As a further solution of the present invention: the adjustment assembly includes a telescopic sleeve rod fixedly connected to the connecting block by bolts, the telescopic sleeve rod is provided with a fixing bolt for fixing the length of the telescopic sleeve rod, and the contact plate is fixedly connected to the bottom of the telescopic sleeve rod.

[0013] As a further solution of the present invention: a cushion block is fixedly arranged between the fixing seat and the bottom plate.

[0014] As a further solution of the present invention: a protective shell is fixedly connected to one side of the bottom plate and is arranged around the outside of the contact plate, the first guide plate and the second guide plate, and the protective shell does not contact the telescopic sleeve rod.

[0015] As a further solution of the present invention: an alignment mark corresponding to the contact plate is arranged on the telescopic sleeve rod, and an alignment block matching the alignment mark is fixedly connected to the bottom plate.

[0016] Beneficial effects of the present invention:

[0017] 1. In the present invention, when the top plate vibrates regularly, the contact plate is driven to vibrate up and down by the telescopic sleeve rod, so that the contact plate continuously moves up and down between the first guide plate and the second guide plate, and the end of the contact plate regularly contacts the first guide plate and the second guide plate, thereby directing the voltage to the first guide plate and the second guide plate, and the contact frequency of the first guide plate and the second guide plate and the contact plate is detected by the corresponding voltage sensor, thereby deducing the vibration frequency. The staff can judge whether the diesel generator set is operating normally through the vibration frequency, and if it is detected that the contact plate is in constant contact with the first guide plate or the second guide plate after starting the diesel generator set, it means that the buffer mechanism is deformed and the buffer mechanism needs to be replaced, thereby realizing the monitoring of the operating status of the diesel generator set and the implementation status of the buffer mechanism.

[0018] 2. In the present invention, during the replacement process of the buffer mechanism, it is necessary to first remove the bolts on the lower positioning seat and the upper positioning seat, then remove the telescopic sleeve rod from the connecting block, start the hydraulic telescopic rod, the hydraulic telescopic rod pushes the top plate to move up, and the top plate drives the corresponding side of the diesel generator set to move up, thereby facilitating the disassembly and replacement of the buffer mechanism, and pushing the upper guide sleeve and the lower guide sleeve to slide to one side, thereby realizing the disassembly of the buffer mechanism, thereby ensuring the shock absorption effect of the diesel generator set. After the buffer mechanism is installed, the telescopic sleeve rod is finally installed, and the length of the telescopic sleeve rod is first adjusted by fixing bolts, and the bolts fix the telescopic sleeve rod on the connecting block so that the alignment mark on the telescopic sleeve rod is aligned with the alignment block. At this time, the contact plate is located in the middle of the first guide plate and the second guide plate, thereby ensuring the accuracy of the detection effect of the first guide plate, the second guide plate and the contact plate, and completing the positioning of the first guide plate, the second guide plate and the contact plate. In the above process, the diesel generator set is supported by the hydraulic telescopic rod, and there is no need to lift the diesel generator set, so the disassembly is more convenient and the disassembly and assembly efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall longitudinal section structure of the present invention;

[0022] Figure 3 yes Figure 2 The enlarged structural diagram at A in the middle;

[0023] Figure 4 It is a structural schematic diagram of the first mounting mechanism and the second mounting mechanism of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the buffer mechanism of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the longitudinal section of the buffer mechanism of the present invention.

[0026] In the figure: 1. fixing seat; 2. first mounting mechanism; 201. bottom plate; 202. lower positioning seat; 3. buffer mechanism; 301. lower connecting plate; 302. lower guide sleeve; 303. spring; 304. upper guide sleeve; 305. upper connecting plate; 306. damper; 4. second mounting mechanism; 401. top plate; 402. upper positioning seat; 5. hydraulic telescopic rod; 6. vibration detection mechanism; 601. connecting block; 602. telescopic sleeve rod; 603. fixing bolt; 604. contact plate; 605. protective shell; 606. first guide plate; 607. second guide plate; 7. support plate; 8. pad. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-6As shown, the present invention is a buffer shock absorbing mechanism for a diesel generator set, comprising a fixing seat 1, the fixing seat 1 is provided with bolt holes, and the fixing seat 1 can be fixed through the bolt holes. The device also includes a first mounting mechanism 2 and a second mounting mechanism 4. The first mounting mechanism 2 is cooperatively arranged above the fixing seat 1, and a buffer mechanism 3 is cooperatively arranged between the first mounting mechanism 2 and the second mounting mechanism 4. The buffer mechanism 3 is provided with two groups, and the two groups of buffer mechanisms 3 are symmetrically distributed at the positions on both sides of the first mounting mechanism 2. The first mounting mechanism 2 and the second mounting mechanism 4 are arranged in parallel, and the diesel generator set is installed above the second mounting mechanism 4; the vibration generated by the diesel generator set is transmitted through the second mounting mechanism 4 The buffer mechanism 3 is handed over, and each group of buffer mechanisms 3 includes a lower connecting plate 301 matched with the first mounting mechanism 2, a lower guide sleeve 302 is fixedly connected to the lower connecting plate 301, a shock absorbing assembly is arranged on the top of the lower connecting plate 301, an upper connecting plate 305 matched with the second mounting mechanism 4 is arranged on the top of the shock absorbing assembly, and the shock absorbing assembly is used to absorb the vibration transmitted from the second mounting mechanism 4, and an upper guide sleeve 304 slidingly matched with the lower guide sleeve 302 is fixedly connected to the upper connecting plate 305, and the lower guide sleeve 302 is slidably sleeved with the upper guide sleeve 304, so that the upper guide sleeve 304 can only move up and down relative to the lower guide sleeve 302, thereby realizing the limitation of the upper connecting plate 305.

[0029] In the present invention, the first mounting mechanism 2 includes a base plate 201, which is cooperatively arranged above the fixed seat 1, and a lower positioning seat 202 that cooperates with the lower connecting plate 301 is fixedly connected to the base plate 201. The second mounting mechanism 4 includes a top plate 401, and an upper positioning seat 402 that cooperates with the upper connecting plate 305 is fixedly connected to the bottom of the top plate 401. The lower positioning seat 202 and the lower connecting plate 301, and the upper positioning seat 402 and the upper connecting plate 305 are fixedly connected by bolts, so that the installation and disassembly of the buffer mechanism 3 are more convenient.

[0030] In the present invention, in order to detect the vibration frequency, a vibration detection mechanism 6 is provided on one side of the top plate 401. The vibration detection mechanism 6 includes a connecting block 601 provided on one side of the top plate 401. The connecting block 601 is fixedly connected to a telescopic sleeve rod 602 by bolts on a side away from the second mounting mechanism 4. The telescopic sleeve rod 602 is provided with a fixing bolt 603 for fixing the length of the telescopic sleeve rod 602. A first guide plate 606 and a second guide plate 607 are provided on a side of the bottom plate 201 close to the telescopic sleeve rod 602. A contact plate 604 is fixedly connected to the lower end of the telescopic sleeve rod 602. The first guide plate 606 and the second guide plate 607 are respectively arranged in parallel on the upper side and the lower side of the contact plate 604. The contact plate 604, the first guide plate 606 and the second guide plate 607 are all made of conductive materials. The contact plate 604 is electrically connected to a power supply device so that there is voltage on the contact plate 604. 6 and the second guide plate 607 are electrically connected to a voltage sensor respectively; when the top plate 401 vibrates regularly, the telescopic sleeve 602 will drive the contact plate 604 to vibrate up and down, so that the contact plate 604 constantly moves up and down between the first guide plate 606 and the second guide plate 607, and the end of the contact plate 604 regularly contacts the first guide plate 606 and the second guide plate 607, thereby directing the voltage to the first guide plate 606 and the second guide plate 607, and detecting the contact frequency of the first guide plate 606 and the second guide plate 607 with the contact plate 604 through the corresponding voltage sensor, thereby inferring the vibration frequency, and the staff can judge whether the diesel generator set is operating normally through the vibration frequency, and if it is detected that the contact plate 604 is in constant contact with the first guide plate 606 or the second guide plate 607 after starting the diesel generator set, it indicates that the buffer mechanism 3 is deformed and the buffer mechanism 3 needs to be replaced.

[0031] In the present invention, in order to facilitate the disassembly of the buffer mechanism 3, a hydraulic telescopic rod 5 is fixedly connected to the bottom plate 201, and the extended end of the hydraulic telescopic rod 5 is fixedly connected to a support plate 7 that matches the top plate 401; when it is detected that the device needs to replace the buffer mechanism 3, the bolts on the buffer mechanism 3 need to be removed, and the hydraulic telescopic rod 5 can be driven to extend, so that the support plate 7 moves up to support the top plate 401, thereby reducing the pressure on the buffer mechanism 3, thereby facilitating the disassembly and replacement of one group of buffer mechanisms 3, and after the replacement is completed, the other group of buffer mechanisms 3 can be disassembled and replaced, thereby ensuring the shock absorption effect of the diesel generator set.

[0032] In the present invention, in order to achieve shock absorption of the diesel generator set, the shock absorbing assembly includes a damper 306 arranged between the lower connecting plate 301 and the upper connecting plate 305, and the outer side of the damper 306 is sleeved with a spring 303 that matches the upper connecting plate 305 and the lower connecting plate 301; the damper 306 is used to absorb the vibration transmitted from above, and the spring 303 is responsible for cooperating with the damper 306 to ensure that the damper 306 can be restored after each change, thereby ensuring the shock absorption effect.

[0033] In the present invention, in order to facilitate adjustment of the installation height of the diesel generator set, a pad 8 is fixedly provided between the fixing base 1 and the base plate 201. By placing different numbers of pads 8, the installation height of the diesel generator set can be adjusted to meet the needs of the work.

[0034] In the present invention, in order to reduce the impact of the environment on the contact plate 604, the first guide plate 606, and the second guide plate 607, a protective shell 605 is fixedly connected to one side of the bottom plate 201 and is arranged around the outside of the contact plate 604, the first guide plate 606, and the second guide plate 607. The protective shell 605 does not contact the telescopic sleeve 602. The protective shell 605 is used to protect the contact plate 604, the first guide plate 606, and the second guide plate 607 to prevent external objects from hitting the contact plate 604, the first guide plate 606, and the second guide plate 607.

[0035] In the present invention, in order to facilitate the adjustment of the relative position of the contact plate 604 and the first guide plate 606 and the second guide plate 607, an alignment mark 9 is provided on the telescopic sleeve 602, and an alignment block 10 matching the alignment mark 9 is fixedly connected to the bottom plate 201; when installing the telescopic sleeve 602, it is necessary to first loosen the fixing bolt 603 to adjust the length of the telescopic sleeve 602 so that the alignment mark 9 on the telescopic sleeve 602 is aligned with the alignment block 10, and then the telescopic sleeve 602 is locked by the fixing bolt 603. At this time, the contact plate 604 is located in the middle of the first guide plate 606 and the second guide plate 607, thereby ensuring the accuracy of the detection effect of the first guide plate 606, the second guide plate 607 and the contact plate 604.

[0036] Working principle of the present invention: when in use, the device is distributed at the two ends or corners of the bottom of the diesel generator set, and the diesel generator set is started, and the diesel generator set transmits vibration to the top plate 401, and the top plate 401 transmits vibration to the lower connecting plate 301, and the damper 306 absorbs the vibration on the lower connecting plate 301, and the spring 303 cooperates with the damper 306 to ensure that the damper 306 can be restored to its original state after each contraction, so as to maintain the implementation effect of the damper 306;

[0037] When the top plate 401 vibrates, it will drive the connection block 601, the telescopic sleeve rod 602, the fixing bolt 603, and the contact plate 604 to vibrate in sequence. The contact plate 604 is connected to an external power supply, so that there is voltage on the contact plate 604. When the contact plate 604 vibrates, it will move up and down between the first guide plate 606 and the second guide plate 607, so that the end of the contact plate 604 intermittently contacts the first guide plate 606 and the second guide plate 607, so that voltage intermittently appears on the first guide plate 606 and the second guide plate 607. The first guide plate 606 and the second guide plate 607 are respectively connected to voltage sensors. The frequency of the voltage on the first guide plate 606 and the second guide plate 607 is detected by the corresponding voltage sensors, so as to detect the vibration frequency of the diesel generator set. By monitoring the vibration frequency of the diesel generator set, it is determined whether the vibration of the diesel generator set is operating normally.

[0038] When elastic fatigue occurs in the buffer mechanism 3, the supporting force of the buffer mechanism 3 is insufficient to support the gravity of the diesel generator set, so that the top plate 401 moves downward, which will cause the diesel generator set to tilt slightly in the corresponding direction. The downward movement of the top plate 401 drives the connecting block 601, the telescopic sleeve rod 602, the fixing bolt 603, and the contact plate 604 to move downward, so that the contact plate 604 is always in contact with the first guide plate 606, so that there is always voltage on the first guide plate 606. By monitoring the data of the voltage sensor, the staff can determine whether the buffer mechanism 3 needs to be replaced. The buffer mechanism 3 During the replacement process, it is necessary to first remove the bolts on the lower positioning seat 202 and the upper positioning seat 402, then remove the telescopic sleeve rod 602 from the connecting block 601, start the hydraulic telescopic rod 5, the hydraulic telescopic rod 5 pushes the top plate 401 to move upward, and the top plate 401 drives the corresponding side of the diesel generator set to move upward, so as to facilitate the disassembly and replacement of the buffer mechanism 3, push the upper guide sleeve 304 and the lower guide sleeve 302 to slide to one side, thereby realizing the removal of the buffer mechanism 3, and then install and operate in the same way, so as to ensure the shock absorption effect of the diesel generator set;

[0039] After the buffer mechanism 3 is installed, the telescopic sleeve 602 is installed last. The length of the telescopic sleeve 602 is first adjusted by the fixing bolt 603. The bolt fixes the telescopic sleeve 602 on the connecting block 601 so that the alignment mark 9 on the telescopic sleeve 602 is aligned with the alignment block 10. At this time, the contact plate 604 is located in the middle of the first guide plate 606 and the second guide plate 607, thereby ensuring the accuracy of the detection effect of the first guide plate 606, the second guide plate 607 and the contact plate 604, and completing the positioning of the first guide plate 606, the second guide plate 607 and the contact plate 604.

[0040] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A buffer shock absorbing mechanism for a diesel generator set, comprising a fixing seat (1), wherein the fixing seat (1) is provided with bolt holes, and wherein: Also includes: A first mounting mechanism (2) and a second mounting mechanism (4), wherein the first mounting mechanism (2) is cooperatively arranged above a fixing seat (1), a buffer mechanism (3) is cooperatively arranged between the first mounting mechanism (2) and the second mounting mechanism (4), the first mounting mechanism (2) and the second mounting mechanism (4) are arranged in parallel, a vibration detection mechanism (6) is cooperatively arranged on one side of the second mounting mechanism (4), the vibration detection mechanism (6) comprises a connecting block (601) arranged on one side of the second mounting mechanism (4), the connecting block (601) being fixedly connected to a side away from the second mounting mechanism (4) An adjustment component, wherein a first guide plate (606) and a second guide plate (607) are arranged on one side of the first mounting mechanism (2) close to the adjustment component, a contact plate (604) is arranged at the lower end of the adjustment component, the first guide plate (606) and the second guide plate (607) are respectively arranged in parallel on the upper side and the lower side of the contact plate (604), the contact plate (604), the first guide plate (606) and the second guide plate (607) are all made of conductive materials, the contact plate (604) is electrically connected to a power supply device, and the first guide plate (606) and the second guide plate (607) are respectively electrically connected to a voltage sensor.

2. A buffer shock absorbing mechanism for a diesel generator set according to claim 1, characterized in that: The buffer mechanism (3) comprises a lower connecting plate (301) matched with the first mounting mechanism (2), a lower guide sleeve (302) being fixedly connected to the lower connecting plate (301), a shock absorbing assembly being arranged on the top of the lower connecting plate (301), an upper connecting plate (305) being arranged on the top of the shock absorbing assembly, and an upper guide sleeve (304) being fixedly connected to the upper connecting plate (305) and being slidably matched with the lower guide sleeve (302).

3. A buffer shock absorbing mechanism for a diesel generator set according to claim 2, characterized in that: The shock absorbing assembly comprises a damper (306) arranged between a lower connecting plate (301) and an upper connecting plate (305), and a spring (303) matching with the upper connecting plate (305) and the lower connecting plate (301) is sleeved on the outer side of the damper (306).

4. A buffer shock absorbing mechanism for a diesel generator set according to claim 1, characterized in that: The first mounting mechanism (2) comprises a bottom plate (201), the bottom plate (201) being arranged above the fixing seat (1), the bottom plate (201) being fixedly connected with a lower positioning seat (202) matching with a lower connecting plate (301), the second mounting mechanism (4) comprising a top plate (401), the bottom of the top plate (401) being fixedly connected with an upper positioning seat (402) matching with an upper connecting plate (305), the lower positioning seat (202) and the lower connecting plate (301), and the upper positioning seat (402) and the upper connecting plate (305) being fixedly connected by bolts.

5. A buffer shock absorbing mechanism for a diesel generator set according to claim 4, characterized in that: A hydraulic telescopic rod (5) is fixedly connected to the bottom plate (201), and an extended end of the hydraulic telescopic rod (5) is fixedly connected to a support plate (7) that matches the top plate (401).

6. A buffer shock absorbing mechanism for a diesel generator set according to claim 4, characterized in that: The adjustment assembly comprises a telescopic sleeve rod (602) fixedly connected to the connection block (601) by bolts, the telescopic sleeve rod (602) is provided with a fixing bolt (603) for fixing the length of the telescopic sleeve rod (602), and the contact plate (604) is fixedly connected to the bottom of the telescopic sleeve rod (602).

7. A buffer shock absorbing mechanism for a diesel generator set according to claim 1, characterized in that: A cushion block (8) is fixedly arranged between the fixing seat (1) and the bottom plate (201).

8. A buffer shock absorbing mechanism for a diesel generator set according to claim 4, characterized in that: A protective shell (605) is fixedly connected to one side of the bottom plate (201) and is arranged around the outside of the contact plate (604), the first guide plate (606), and the second guide plate (607), and the protective shell (605) does not contact the telescopic sleeve rod (602).

9. A buffer shock absorbing mechanism for a diesel generator set according to claim 6, characterized in that: The telescopic sleeve rod (602) is provided with an alignment mark (9) corresponding to the contact plate (604), and the bottom plate (201) is fixedly connected with an alignment block (10) matching the alignment mark (9).

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