Damping mechanism of accessory quick-changing device and operation machine

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a shock-absorbing mechanism of an accessory quick-changing device and an operation machine.The shock-absorbing mechanism of the accessory quick-changing device comprises a movable arm, the quick-changing device and an elastic shock-absorbing assembly, the movable arm and the quick-changing device are correspondingly provided with first shaft holes used for inserting a mounting shaft, and the elastic shock-absorbing assembly is arranged on the mounting shaft in a sleeved mode. And the elastic damping assembly is arranged between the movable arm and the quick change device. Therefore, the assembly clearance between the movable arm and the quick-change device is adjusted through the deformability of the elastic damping assembly, axial movement along the mounting shaft can be prevented, excessive tensioning is avoided, normal rotation of the accessory and the quick-change device is not affected, and the service life of the accessory is prolonged. And meanwhile, impact and vibration between the movable arm and the quick change device can be counteracted through the elasticity and vibration absorption function of the elastic damping assembly, and the abnormal sound risk caused by clearance contact is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a shock absorption mechanism of an attachment quick-change device and a working machine. Background Art

[0002] Construction machinery such as a skid steer loader is provided with a quick-change device, which is mainly used to quickly lock and disconnect the main boom and an attachment such as a bucket. The conventional quick-change method is to hang the quick-change frame on the pin shafts on both sides of the boom, assemble it on the boom and the pin shafts on both sides, and allow the quick-change device to drive the attachment to rotate around the boom pin shaft under the drive of a hydraulic cylinder. There is a certain assembly gap between the quick-change device and the boom in the Y direction, that is, the axial direction of the boom pin shaft, which is beneficial to avoid and reduce the lateral friction between the boom and the quick-change device, and facilitate the rotation of the locking combination of the quick-change device and the attachment around the boom pin shaft.

[0003] Due to the above-mentioned assembly gap, when the whole machine travels on a bumpy road surface, there is a risk of impact vibration and clearance contact abnormal noise between the quick-change device and the boom. In addition, under normal construction operation conditions, the attachment will be subjected to Y-direction extrusion of the working medium, generating Y-direction impact and load, which will also be transmitted to the vehicle body through the assembly gap between the quick-change device and the boom, causing more impact vibration problems.

[0004] At present, in order to overcome the above problems, the conventional method is to insert several stainless steel sheets between the quick-change device and the boom to adjust and eliminate the assembly gap. However, if too many stainless steel sheets are inserted, there will be an over-tightening problem, affecting the normal rotation of the quick-change device and the attachment. If too few stainless steel sheets are inserted, there will still be a mating gap, and there will still be a risk of impact vibration and clearance contact abnormal noise. Summary of the Utility Model

[0005] In view of this, the utility model provides a shock absorption mechanism of an attachment quick-change device and a working machine to solve or improve the problem in related technologies that by inserting several stainless steel sheets between the quick-change device and the boom to adjust the assembly gap, there is over-tightening, or there is still a risk of impact vibration and clearance contact abnormal noise.

[0006] In a first aspect, the utility model provides a shock absorption mechanism of an attachment quick-change device, including a boom, a quick-change device and an elastic shock absorption component. The boom and the quick-change device are respectively provided with first shaft holes for inserting a mounting shaft. The elastic shock absorption component is sleeved on the mounting shaft, and the elastic shock absorption component is arranged between the boom and the quick-change device.

[0007] Beneficial effects: The assembly gap between the boom and the quick-change device is adjusted by the deformation ability of the elastic shock-absorbing component, which can prevent axial movement along the installation axis, avoid excessive tension, and does not affect the normal rotation of the attachment and the quick-change device. At the same time, the elasticity and shock-absorbing function of the elastic shock-absorbing component can offset the impact and vibration between the boom and the quick-change device, eliminating the risk of abnormal noise caused by gap contact.

[0008] In an alternative embodiment, the elastic shock-absorbing component includes:

[0009] A first clamping seat and a second clamping seat which are oppositely arranged, sleeved on the installation shaft, the first clamping seat and the second clamping seat are arranged between the boom and the quick-change device, and there is a gap between the first clamping seat and the second clamping seat along the axial direction of the installation shaft;

[0010] An elastic shock-absorbing body, sleeved on the first clamping seat and the second clamping seat, and both ends of the elastic shock-absorbing body are abutted against the first clamping seat and the second clamping seat respectively.

[0011] Beneficial effects: It is convenient for installation, can eliminate the Y-directional fitting gap, avoid Y-directional impact vibration, and also play a role in buffering and shock absorption by using the elastic deformation ability of the elastic shock-absorbing body, preventing collision abnormal noise, etc.

[0012] In an alternative embodiment, the first clamping seat is provided with a first step structure, the second clamping seat is provided with a second step structure opposite to the first step structure, one end of the elastic shock-absorbing body abuts against the first step structure, and the other end abuts against the second step structure.

[0013] Beneficial effects: It realizes the tight and stable fit connection between the two clamping seats and the elastic shock-absorbing body, and the elastic shock-absorbing body does not directly contact the boom and the quick-change device, prolonging the service life of the elastic shock-absorbing body.

[0014] In an alternative embodiment, the elastic shock-absorbing body includes a first annular shock-absorbing body and a pair of second annular shock-absorbing bodies, the pair of second annular shock-absorbing bodies are respectively arranged at both ends of the first annular shock-absorbing body, and the elastic coefficient of the first annular shock-absorbing body is greater than that of the second annular shock-absorbing body.

[0015] Beneficial effects: Through the mutual cooperation of elastic shock-absorbing layers with different elastic coefficients, a composite shock-absorbing body structure is formed, which can not only effectively control the Y-directional gap, but also have high resilience and shock-absorbing ability, ensuring that the problems of gap contact abnormal noise and shock absorption are reliably solved.

[0016] In an alternative embodiment, the thickness of the first annular shock-absorbing body is greater than that of the second annular shock-absorbing body, and / or,

[0017] The material of the second annular shock absorber is a whisker-shaped material or a foaming material.

[0018] Beneficial effects: Composed of elastic material layers with different thicknesses, fully meeting the usage requirements of the elastic shock absorber; using a whisker-shaped material with resilience or a foaming material with pores can offset the assembly clearance, prevent uncontrolled movement of the attachment and the quick-change device in the Y direction, and does not affect the normal rotation of the attachment and the quick-change device.

[0019] In an alternative embodiment, a first lubricating layer is provided on the end face of the first clamping seat in contact with the boom, and / or,

[0020] A second lubricating layer is provided on the end face of the second clamping seat in contact with the quick-change device.

[0021] Beneficial effects: Lubricating materials can be used on the surfaces of the two clamping seats in contact with the boom and the quick-change device to reduce the friction force of the contact surface, extend the service life of the device, and improve the operation efficiency.

[0022] In an alternative embodiment, a third lubricating layer is provided on the surface of the first clamping seat and / or the second clamping seat in contact with the mounting shaft.

[0023] Beneficial effects: Arranging a lubricating material layer on the surfaces of the two clamping seats in contact with the mounting shaft can reduce the frictional wear during rotation, improve the efficiency and service life of the overall mechanical operation.

[0024] In an alternative embodiment, the material of the first clamping seat and / or the second clamping seat is metal.

[0025] Beneficial effects: The two clamping seats are made of metal to wrap the elastic shock absorber, which can protect the elastic shock absorber, ensure good stability and reliability during use, extend the service life of the device, and reduce the frequency of replacement and maintenance.

[0026] In an alternative embodiment, there are a pair of booms, and the pair of booms are respectively arranged at both ends of the quick-change device, and an elastic shock absorption assembly is provided between each of the pair of booms and the quick-change device.

[0027] Beneficial effects: Arranging a set of elastic shock absorption assemblies on both the left and right booms can reliably eliminate the clearance on both sides, so that in case of uneven road surfaces or sudden load changes, etc., it can respond quickly, reduce the impact of vibration on the equipment, ensure good cooperation and coordinated work between the components of the device, and improve the stability of the equipment.

[0028] In a second aspect, the present invention also provides a work machine, including the shock absorption mechanism of the attachment quick-change device as described in any one of the above.

[0029] Beneficial effects: Since the working machine includes a shock-absorbing mechanism of the attachment quick-change device, which has the same effects as the shock-absorbing mechanism of the attachment quick-change device, they will not be elaborated here. Description of the drawings

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Schematic diagram of the installation position of the shock-absorbing mechanism of the attachment quick-change device according to an embodiment of the present invention;

[0032] Figure 2 Schematic diagram of the structure of the shock-absorbing mechanism of the attachment quick-change device according to an embodiment of the present invention;

[0033] Figure 3 Schematic diagram of the structure of the elastic shock-absorbing component according to an embodiment of the present invention;

[0034] Figure 4 Schematic diagram of the structure of the elastic shock-absorbing body according to an embodiment of the present invention;

[0035] Figure 5 Partial schematic diagram of the shock-absorbing mechanism of the attachment quick-change device according to an embodiment of the present invention;

[0036] Description of the reference numerals:

[0037] 1. Attachment; 2. Boom; 21. Mounting shaft; 3. Elastic shock-absorbing component; 31. First card seat; 311. First step structure; 32. Elastic shock-absorbing body; 321. Second annular shock-absorbing body; 322. First annular shock-absorbing body; 33. Second card seat; 331. Second step structure; 4. Quick-change device; 5. Body structure. Detailed embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0039] The following will be combined with Figures 1 to 5, describe the shock absorption mechanism of the attachment quick-change device and the work machinery of the embodiments of the present utility model.

[0040] According to an embodiment of the present utility model, on the one hand, a shock absorption mechanism of an attachment quick-change device is provided, which is applicable to construction machinery such as skid steer loaders, etc., and includes a boom 2, an elastic shock absorption component 3, and a quick-change device 4. Taking a crawler or wheeled skid steer loader as an example, this embodiment will be described. As Figure 1 shown, the skid steer loader includes a body structure 5, and the boom 2 is arranged on the body structure 5. The attachment 1, that is, the working device such as a bucket, is connected to the boom 2 through the quick-change device 4, realizing the quick connection and separation of the attachment 1 on the construction machinery.

[0041] See Figure 5 shown, the boom 2 and the quick-change device 4 are correspondingly provided with first shaft holes for inserting the mounting shaft 21. During installation, both ends of the mounting shaft 21 are respectively inserted into the first shaft holes on both sides, so that the quick-change device 4 can rotate around the mounting shaft 21. At the same time, the elastic shock absorption component 3 is sleeved on the mounting shaft 21, and the elastic shock absorption component 3 is arranged between the boom 2 and the quick-change device 4. It should be noted that taking the placement position of the shock absorption mechanism of the attachment quick-change device as shown in Figure 5 shown, the direction indicated by the arrow in the figure is the axial direction of the mounting shaft 21, and hereinafter the Y direction represents the axial direction of the mounting shaft 21.

[0042] With such a setting, an elastic shock absorption component 3 is added between the boom 2 and the quick-change device 4. Thus, the Y-direction assembly clearance between the boom 2 and the quick-change device 4 is adjusted by the deformation ability of the elastic shock absorption component 3, which can prevent the connecting body of the attachment 1 and the quick-change device 4 from moving axially along the mounting shaft 21, that is, in the Y direction during work, and avoid excessive tensioning. Furthermore, the effective control of the Y-direction clearance between the boom 2 and the quick-change device 4 is realized, without affecting the normal rotation of the attachment 1 and the quick-change device 4. At the same time, by using the elasticity and vibration absorption function of the elastic shock absorption component 3, the impact and vibration between the boom 2 and the quick-change device 4 can be offset, eliminating the risk of abnormal noise caused by clearance contact.

[0043] In some embodiments of the present utility model, as Figure 3 shown, the elastic shock absorption component 3 includes a first clamping seat 31, an elastic shock absorption body 32, and a second clamping seat 33. As Figure 5As shown, the first card seat 31 and the second card seat 33 are arranged opposite to each other, and both the first card seat 31 and the second card seat 33 are sleeved on the mounting shaft 21. Specifically, the first card seat 31 and the second card seat 33 are correspondingly provided with second shaft holes, and the mounting shaft 21 passes through the second shaft holes. The first card seat 31 and the second card seat 33 are arranged between the moving arm 2 and the quick-change device 4, and there is a gap between the first card seat 31 and the second card seat 33 along the axial direction of the mounting shaft 21, i.e., the Y direction. It should be noted that this gap limits the movement displacement of the moving arm 2 and the quick-change device 4 squeezing the elastic shock-absorbing component 3, provides a deformation space for the elastic shock-absorbing component 3, and the size of this gap needs to be specifically determined according to actual design requirements.

[0044] The elastic shock-absorbing body 32 is made of an elastic material and can be compressed and rebound. Refer to Figure 3 , the elastic shock-absorbing body 32 is sleeved on the first card seat 31 and the second card seat 33, and both ends of the elastic shock-absorbing body 32 are respectively abutted against the first card seat 31 and the second card seat 33. With such a setting, the elastic shock-absorbing body 32 in the middle is clamped by the two side card seats, and there is a certain gap between the two side card seats. Then the whole is installed between the moving arm 2 and the quick-change device 4, which is convenient for assembly, can eliminate the Y-directional fitting gap, avoid Y-directional crosstalk, and moreover, by using the elastic deformation ability of the elastic shock-absorbing body 32, it can also play a role in buffering and shock absorption, preventing collision abnormal noises, etc.

[0045] In some embodiments of the present invention, as Figure 3 shown, the first card seat 31 is provided with a first step structure 311, and the second card seat 33 is provided with a second step structure 331 opposite to the first step structure 311. One end of the elastic shock-absorbing body 32 abuts against the first step structure 311, and the other end abuts against the second step structure 331. With such a setting, through the two side step structures, a tight and stable fitting connection between the two side card seats and the elastic shock-absorbing body 32 can be realized, and the elastic shock-absorbing body 32 does not directly contact the moving arm 2 and the quick-change device 4, which can extend the service life of the elastic shock-absorbing body 32.

[0046] In some embodiments of the present invention, as Figure 4 shown, the elastic shock-absorbing body 32 includes a first annular shock-absorbing body 322 and a pair of second annular shock-absorbing bodies 321, and the pair of second annular shock-absorbing bodies 321 are respectively arranged at both ends of the first annular shock-absorbing body 322. Specifically, the first annular shock-absorbing body 322 and the pair of second annular shock-absorbing bodies 321 can be integrally processed and formed.

[0047] Moreover, the elastic coefficient of the first annular shock absorber 322 is greater than that of the second annular shock absorber 321. That is to say, the elastic shock absorber 32 can be formed by combining and processing a group of elastic material layers with different elastic coefficients. The first annular shock absorber 322 has a relatively large elastic coefficient and strong resilience, and is mainly used to provide strong resilience and play a shock-absorbing role when the whole elastic shock absorber 32 is compressed and the second annular shock absorber 321 has been compressed. The two second annular shock absorbers 321 have relatively small elastic coefficients and small resilience, and are mainly used to control the Y-direction clearance between the boom 2 and the quick-change device 4 during installation. That is to say, the purpose of the second annular shock absorber 321 is to offset the Y-direction clearance between the boom 2 and the quick-change device 4 under the working condition that the second annular shock absorber 321 is slightly compressed.

[0048] With such a setting, through the mutual cooperation of elastic shock-absorbing layers with different elastic coefficients, a composite shock-absorbing body structure is formed, which can not only effectively control the Y-direction clearance, but also have high resilience and vibration-absorbing capabilities, ensuring that the problems of clearance contact abnormal noise and shock absorption are reliably solved.

[0049] In some embodiments of the present invention, as Figure 4 shown, the thickness of the first annular shock absorber 322 is greater than that of the second annular shock absorber 321. It should be noted that, taking the placement position of the shock-absorbing mechanism of the attachment quick-change device as shown in Figure 4 the figure, the left-right direction in the figure is the thickness direction referred to. That is to say, the first annular shock absorber 322 has a relatively large thickness, and can form better vibration and shock energy absorption and attenuation capabilities during compression deformation to provide high resilience and vibration-absorbing performance. The second annular shock absorber 321 has a relatively small thickness, which can meet the installation requirements for offsetting the Y-direction clearance. The overall design is reasonable and fully meets the use requirements of the elastic shock absorber 32.

[0050] Optionally, the material of the second annular shock absorber 321 is a whisker-shaped material or a foaming material. With such a setting, by using a whisker-shaped material layer with resilience or a foaming material layer with pores, the assembly clearance can be effectively offset during slight compression, meeting the installation requirements, preventing uncontrolled Y-direction movement of the attachment 1 and the quick-change device 4, and not affecting the normal rotation of the attachment 1 and the quick-change device 4.

[0051] In some embodiments of the present invention, a lubricating material layer is provided on the end face of the first clamping seat 31 and / or the end face of the second clamping seat 33. For example, materials with small friction such as lubricating oil and grease can be coated, or a lubricating layer can be formed through surface treatment. Specifically, as Figure 5As shown in the figure, a first lubricating layer is provided on the end face of the first card seat 31 in contact with the moving arm 2, and a second lubricating layer is provided on the end face of the second card seat 33 in contact with the quick-change device 4. With this setting, lubricating materials can be used on the surfaces of the two card seats in contact with the moving arm 2 and the quick-change device 4 to reduce the frictional force of the contact surface, extend the service life of the device, and improve the operation efficiency.

[0052] In some embodiments of the present invention, a third lubricating layer is provided on the surface of the first card seat 31 and / or the second card seat 33 in contact with the mounting shaft 21. Optionally, materials with low frictional force such as lubricating oil and grease are coated, or a lubricating layer is formed through surface treatment. With this setting, a lubricating material layer is arranged on the surfaces of the two card seats in contact with the mounting shaft 21, which can reduce frictional wear during rotation and improve the efficiency and service life of the overall mechanical operation.

[0053] In some embodiments of the present invention, the material of the first card seat 31 and / or the second card seat 33 is metal. With this setting, the two card seats can be made of metal to cover the elastic shock absorber 32, which can protect the elastic shock absorber 32, ensure good stability and reliability during use, extend the service life of the device, and reduce the frequency of replacement and maintenance.

[0054] In some embodiments of the present invention, as Figure 2 shown, there are a pair of moving arms 2, and the pair of moving arms 2 are respectively arranged at both ends of the quick-change device 4, and an elastic shock-absorbing component 3 is provided between the pair of moving arms 2 and the quick-change device 4. With this setting, a set of elastic shock-absorbing components 3 are arranged on both the left and right moving arms 2, which can reliably eliminate the clearance on both sides. Therefore, in the case of bumps on uneven roads, etc., it can respond quickly, reduce the impact of vibration on the equipment, ensure good cooperation and coordinated work between the various components of the equipment, and improve the stability of the equipment.

[0055] In summary, the embodiment of the present invention provides a shock-absorbing mechanism for an attachment quick-change device. An elastic shock-absorbing component 3 is added between the moving arm 2 and the quick-change device 4, and the elastic shock-absorbing component 3 is sleeved on the mounting shaft 21, so as to facilitate the control of the Y-direction assembly clearance between the moving arm 2 and the quick-change device 4, which is easy to install and does not affect the normal rotation of the attachment 1 and the quick-change device 4. In addition, when the elastic shock-absorbing component 3 abuts against the sides of the quick-change device 4 and the moving arm 2, the elastic and shock-absorbing functions of the elastic shock absorber 32 can be used to cancel the impact and vibration at both ends of the quick-change device 4 and the moving arm 2. Its shock-absorbing ability is strong, effectively solving the problems of impact vibration and contact abnormal sound. This shock-absorbing structure is exquisitely designed, durable, and convenient for later replacement and maintenance.

[0056] According to an embodiment of the present utility model, on the other hand, a working machine is further provided. It can be understood that the working machine includes, but is not limited to, a skid steer loader, an excavator, etc. Specifically, taking the skid steer loader as an example, this embodiment will be described. The working machine includes a shock absorption mechanism of the attachment quick-change device in each of the above embodiments. With such a setting, the assembly gap between the boom 2 and the quick-change device 4 is adjusted by the deformation ability of the elastic shock absorption component 3, which can prevent axial movement along the installation axis 21, avoid excessive tensioning, and does not affect the normal rotation of the attachment 1 and the quick-change device 4. At the same time, the elastic and vibration absorption functions of the elastic shock absorption component 3 can offset the impact and vibration between the boom 2 and the quick-change device 4, and eliminate the risk of abnormal noise caused by gap contact. The derivation process of this beneficial effect is roughly similar to that of the beneficial effect of the shock absorption mechanism of the attachment quick-change device described above, so it will not be elaborated here.

[0057] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A shock-absorbing mechanism for a quick-change device of attachments, characterized in that, It includes a boom (2), a quick-change device (4), and an elastic shock-absorbing component (3). The boom (2) and the quick-change device (4) are respectively provided with first shaft holes for inserting and installing a shaft (21). The elastic shock-absorbing component (3) is sleeved on the installation shaft (21), and the elastic shock-absorbing component (3) is arranged between the boom (2) and the quick-change device (4).

2. The shock absorption mechanism of the attachment quick-change device according to claim 1, characterized in that, The elastic shock-absorbing component (3) includes: A first clamping seat (31) and a second clamping seat (33) which are oppositely arranged and sleeved on the installation shaft (21). The first clamping seat (31) and the second clamping seat (33) are arranged between the boom (2) and the quick-change device (4), and there is a gap between the first clamping seat (31) and the second clamping seat (33) along the axial direction of the installation shaft (21); An elastic shock-absorbing body (32) sleeved on the first clamping seat (31) and the second clamping seat (33), and both ends of the elastic shock-absorbing body (32) are respectively abutted against the first clamping seat (31) and the second clamping seat (33).

3. The shock absorption mechanism of the attachment quick-change device according to claim 2, characterized in that, The first clamping seat (31) is provided with a first step structure (311), and the second clamping seat (33) is provided with a second step structure (331) opposite to the first step structure (311). One end of the elastic shock-absorbing body (32) is abutted against the first step structure (311), and the other end is abutted against the second step structure (331).

4. The shock absorption mechanism of the attachment quick-change device according to claim 2, characterized in that The elastic shock-absorbing body (32) includes a first annular shock-absorbing body (322) and a pair of second annular shock-absorbing bodies (321). The pair of second annular shock-absorbing bodies (321) are respectively arranged at both ends of the first annular shock-absorbing body (322), and the elastic coefficient of the first annular shock-absorbing body (322) is greater than that of the second annular shock-absorbing body (321).

5. The shock absorption mechanism of the attachment quick-change device according to claim 4, characterized in that, The thickness of the first annular shock-absorbing body (322) is greater than that of the second annular shock-absorbing body (321), and / or The material of the second annular shock-absorbing body (321) is a whisker-shaped material or a foaming material.

6. The shock-absorbing mechanism of the attachment quick-change device according to claim 2, characterized in that, The end face of the first clamping seat (31) in contact with the boom (2) is provided with a first lubricating layer, and / or The end face of the second clamping seat (33) in contact with the quick-change device (4) is provided with a second lubricating layer.

7. The shock absorption mechanism of the attachment quick-change device according to claim 2, characterized in that, The surface of the first clamping seat (31) and / or the second clamping seat (33) in contact with the installation shaft (21) is provided with a third lubricating layer.

8. The shock-absorbing mechanism of the attachment quick-change device according to claim 2, characterized in that, The material of the first clamping seat (31) and / or the second clamping seat (33) is metal.

9. The shock-absorbing mechanism of the attachment quick-change device according to claim 1, characterized in that, There are a pair of booms (2), and the pair of booms (2) are respectively arranged at both ends of the quick-change device (4), and the elastic shock-absorbing component (3) is arranged between each pair of the booms (2) and the quick-change device (4).

10. An earthmoving machine, characterized in that, It includes a shock-absorbing mechanism of the attachment quick-change device according to any one of claims 1 to 9.

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