Clamp assembly and stretching device

Abstract

The utility model provides a clamp assembly and a stretching device, relates to the technical field of mechanical property detection of non-metallic materials, and aims to solve the technical problem that a traditional rigid foam stretching clamp in the prior art can only clamp and fix one sample. The clamp assembly comprises a body, the body comprises a top wall and two side walls, and the top wall and the two side walls form a groove; at least parts of the fixing plates are arranged in the grooves, the two fixing plates are respectively connected with one side wall, the two fixing plates can be close to each other or far away from each other, and the sample can be clamped under the condition that the two fixing plates are close to each other; and the hanging pin is connected to the two fixing plates and is used for fixing the sample. The clamp assembly disclosed by the utility model can be used for simultaneously meeting tensile experiments of two hard foam tensile samples with different specifications.

Description

TECHNICAL FIELD

[0001] The utility model relates to nonmetallic material mechanics performance detection field, specifically, relate to a fixture assembly and tensile device. BACKGROUND

[0002] Two different specifications of hard foam tensile samples are respectively regulated in section 4.1 and section 7.2 in GB / T 9641-1988 "hard foam tensile performance test method", and they are respectively sample that can bear clamp pressure and sample that cannot bear clamp pressure, and the sample needs to be clamped by two different styles of clamps. The traditional hard foam tensile clamp can only clamp and fix one kind of sample, and the two types of samples regulated in GB / T 9641 cannot be clamped by the same set of clamps, so that the number of clamps is more, and the test cost is increased. UTILITY MODEL CONTENTS

[0003] The utility model aims at solving the technical problem that the traditional hard foam tensile clamp can only clamp and fix one kind of sample in prior art or related art.

[0004] The utility model provides a fixture assembly in a first aspect.

[0005] The utility model provides a tensile device in a second aspect.

[0006] The fixture assembly provided by the utility model comprises a body, the body comprises a top wall and two side walls, the top wall and the two side walls form a recess, two fixed plates, at least part of the fixed plate is arranged in the recess, and the two fixed plates are connected with a side wall respectively, and the two fixed plates can approach each other or move away from each other, and the sample can be clamped in the case that the two fixed plates approach each other, a hanging pin, the two fixed plates all comprise a through hole, the hanging pin passes through the through hole of the two fixed plates and is connected to the two fixed plates, and the hanging pin is used for fixing the sample.

[0007] The clamp assembly of the utility model is applied to the stretching device, the stretching device includes two clamp assemblies, each clamp assembly includes a body, the body includes a top wall and two side walls, the top wall and the two side walls form a U-shaped groove, at least part of each fixed plate is arranged in the groove, and the two fixed plates are slidably connected with a side wall respectively, and the two fixed plates can approach each other or move away from each other, in the case that the two fixed plates approach each other, one end of the test sample can be clamped, and the hanging pin is connected to the two fixed plates, and the hanging pin is used for hanging one end of the test sample, that is, the test sample can be hung on the hanging pin, so as to be fixed. The clamp assembly of the utility model has two test sample fixing modes, for the test sample that can bear the clamp pressure, the test sample can be clamped by the two fixed plates approaching each other, and the 'clamping type fixing' is completed, and for the test sample that cannot bear the clamp pressure, the test sample can be fixed by the hanging pin, and the'suspension type fixing' is completed. It can be seen that the clamp assembly of the utility model can simultaneously satisfy the stretching experiments of two different specifications of rigid foam stretching test samples.

[0008] In some technical solutions, the clamp assembly further includes a concave-convex structure arranged on the surface of each fixed plate close to the other fixed plate, and in the case that the two fixed plates approach each other, the concave-convex structure can contact the test sample and clamp the test sample.

[0009] In the technical solution, the surface of each fixed plate close to the other fixed plate is provided with the concave-convex structure, so that in the case that the two fixed plates approach each other, the concave-convex structure can contact the test sample, thereby improving the friction between the fixed plate and the test sample, improving the clamping force of the test sample, and avoiding the test sample from falling off in the stretching process. Of course, the surface of each fixed plate close to the other fixed plate can also be provided with rubber, and the rubber can also improve the friction between the fixed plate and the test sample, thereby improving the clamping force of the test sample.

[0010] In some technical solutions, the clamp assembly further includes two transmission rods, each transmission rod can pass through a side wall and be threadedly connected with the corresponding fixed plate; two guide rods, each guide rod is connected with a side wall, and a guide hole is arranged on the fixed plate, the guide rod can be inserted into the guide hole and be used for guiding the movement direction of the corresponding fixed plate; wherein the two transmission rods can rotate, and under the action of the guide rod, the two fixed plates can approach each other or move away from each other.

[0011] In the technical scheme, the clamp assembly further comprises transmission rods and guide rods, each of the transmission rods is capable of penetrating through a side wall and is threadedly connected with a corresponding fixed plate, each of the guide rods is connected with a side wall, and the fixed plate is provided with a guide hole, the guide rod is capable of being inserted into the guide hole and is used for guiding the movement direction of the corresponding fixed plate. Further, the two transmission rods are capable of rotating, and two limiting members are further provided, one limiting member is correspondingly provided on each side wall, and the two limiting members are capable of limiting the corresponding transmission rod to move in a first direction, that is, the relative movement direction of the two fixed plates. In this way, when the two transmission rods rotate along the axes thereof, the rotating force can be converted into driving force in the first direction under the guidance of the guide rods, so that the two fixed plates can move close to or away from each other.

[0012] In some technical schemes, optionally, in order to realize that the two fixed plates move close to or away from each other, a small air cylinder can also be arranged on a side wall, the output rod of the air cylinder penetrates through the side wall and is connected with a fixed plate, and the fixed plate is driven to move towards or away from the other fixed plate. This scheme can also realize that the two fixed plates move close to or away from each other.

[0013] In some technical schemes, optionally, each side wall comprises two first connecting holes arranged in a transverse direction and two second connecting holes arranged in a longitudinal direction, and the clamp assembly comprises a first clamping state and a second clamping state. In the first clamping state, each guide rod is capable of penetrating through the first connecting hole and the guide hole and is used for fixing the test sample by means of the hanging pin. In the second clamping state, each guide rod is capable of penetrating through the second connecting hole and the guide hole and is used for clamping and fixing the test sample by means of the two fixed plates.

[0014] In the technical scheme, the clamp assembly comprises a first clamping state and a second clamping state. In the first clamping state, the guide rod is capable of penetrating through the first connecting hole and the guide hole and is used for "suspension fixing" the test sample. In the second clamping state, the two fixed plates can be rotated by 90 degrees clockwise or counterclockwise, so that the guide rod is capable of penetrating through the second connecting hole and the guide holes of the two fixed plates and is used for "clamping fixing" the test sample by means of the two fixed plates.

[0015] In some technical schemes, optionally, the clamp assembly further comprises force adding rods, and each transmission rod is provided with a force adding rod at an end away from the fixed plate.

[0016] In the technical scheme, each transmission rod is provided with a force adding rod at an end away from the fixed plate, so that the user can conveniently rotate the transmission rod, thereby saving time and effort when fixing the test sample.

[0017] In some technical solutions, each fixed plate comprises: a clamping part plate, which is arranged in the groove; and a connecting part plate, the number of the hanging pins is two, and the two hanging pins are arranged on the connecting part plate, and the connecting part plate is located outside the groove.

[0018] In the technical solution, the number of the hanging pins is two, and the two hanging pins are arranged on the connecting part plate, so that two test samples can be simultaneously fixed in a "hanging mode", and the tensile test of the two test samples can be completed at one time, of course, the number of the hanging pins can also be greater than or equal to three according to requirements. Further, the connecting part plate is located outside the groove, which is more conducive to the assembly of the hanging pins.

[0019] In some technical solutions, the clamp assembly is applied to a tensile device, the tensile device comprises a driving device, and the clamp assembly further comprises a mounting base rod, one end of which is connected with the top wall and the other end of which is connected with the driving device.

[0020] In the technical solution, the tensile experiment can be completed by connecting the mounting base rod with the driving device.

[0021] The second aspect of the utility model provides a kind of tensile device, comprising: two like the clamp assembly provided in any one of the first aspect of the utility model.

[0022] Additional aspects and advantages of the utility model will be partly given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the utility model will become apparent and are easily understood from the description of embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 One of the structure schematic diagram of the clamp assembly of the utility model is shown;

[0025] Figure 2 The second structure schematic diagram of the clamp assembly of the utility model is shown;

[0026] Figure 3 The third structure schematic diagram of the clamp assembly of the utility model is shown;

[0027] Figure 4 The fourth structure schematic diagram of the clamp assembly of the utility model is shown;

[0028] Figure 5 One of the structure schematic diagram of the tensile device is shown;

[0029] Figure 6 The second structure schematic diagram of the tensile device is shown.

[0030] Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0031] 100 Fixture assembly, 1 body, 12 top wall, 14 side wall, 16 groove, 2 fixing plate, 22 clamping part plate, 24 connecting part plate, 26 through hole, 28 guide hole, 3 hanging pin, 41 transmission rod, 42 guide rod, 422 first connecting hole, 424 second connecting hole, 43 force-applying rod, 44 mounting base rod, 45 first locking nut, 46 second locking nut, 5 sample, 7 tensile device. Detailed Implementation

[0032] To better understand the above aspects, features, and advantages of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0033] Numerous specific details are set forth in the following description in order to provide a full understanding of the embodiments according to the present invention. However, the embodiments according to the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the embodiments according to the present invention is not limited to the specific embodiments disclosed below.

[0034] like Figures 1 to 3 As shown, the clamp assembly 100 provided by this utility model includes: a body 1, which includes a top wall 12 and two side walls 14, forming a groove 16; two fixing plates 2, at least a portion of which are disposed in the groove 16, and each fixing plate 2 is connected to one side wall 14, and the two fixing plates 2 can move closer to each other or further away from each other, so that the sample 5 can be clamped when the two fixing plates 2 are close to each other; and a hanging pin 3, which includes a through hole 26 in each fixing plate 2, through which the hanging pin 3 passes and is connected to the two fixing plates 2, and is used to fix the sample 5.

[0035] The utility model discloses a fixture assembly 100 is applied to the stretching device 7, and the stretching device 7 includes two fixture assemblies 100, and each fixture assembly 100 includes the body 1, and the body 1 includes the top wall 12 and two side walls 14, and the top wall 12 and two side walls 14 form U -shaped groove 16, and the at least part of each fixed plate 2 is located in the recess 16, and two fixed plates 2 are slidably connected with a side wall 14 respectively, and two fixed plates 2 can be close to each other or away from each other, and can clamp the test sample 5 under the condition that two fixed plates 2 are close to each other, and the hanging pin 3 is connected to two fixed plates 2, and the hanging pin 3 is used for fixing test sample 5. The utility model discloses a fixture assembly 100, possesses two kinds of fixed test sample 5's mode, and for the test sample 5 that can bear the fixture pressure, can clamp test sample 5 through two fixed plates 2 can be close to each other, complete " clamping type fixed", the state of " clamping type fixed" as shown in Figure 6 For the test sample 5 that can not bear the fixture pressure, can fix test sample 5 through the hanging pin 3, complete " hanging type fixed", the state of " hanging type fixed" as shown in Figure 5 It can be seen that the fixture assembly 100 of the utility model can meet the stretching test of two different specifications of rigid foam stretching test sample 5.

[0036] In some technical solutions, optionally, the hanging pin 3 is detachably connected with the fixed plate 2, so that when testing the test sample 5 that can bear the fixture pressure, the long edges of the two fixed plates 2 are horizontally installed, and the hanging pin 3 is not needed to be installed, as shown in Figure 6 When testing the test sample 5 that can not bear the fixture pressure, the long edges of the two fixed plates 2 are vertically installed, as shown in Figure 5 The hanging pin 3 is installed, and this kind of setting is more convenient to assemble according to different requirements.

[0037] In some technical solutions, optionally, the two fixed plates 2 are provided with through holes 26, the hanging pin 3 can pass through the through holes 26 on the two fixed plates 2, and is fixed on the two fixed plates 2 through a fixing part, so that the hanging pin 3 does not block the mutual movement of the two fixed plates 2.

[0038] In some technical solutions, optionally, the fixture assembly 100 further includes a concave-convex structure arranged on the surface of each fixed plate 2 close to the other fixed plate 2, and the concave-convex structure can contact the test sample 5 and clamp the test sample 5 when the two fixed plates 2 are close to each other.

[0039] In the technical scheme, each fixed plate 2 is provided with a concave-convex structure on the surface close to the other fixed plate 2, so that the concave-convex structure can contact the test sample 5 when the two fixed plates 2 are close to each other, thereby improving the friction between the fixed plate 2 and the test sample 5, and improving the clamping force on the test sample 5, so as to avoid the test sample 5 from falling off during the stretching process. Of course, a rubber can also be provided on the surface of each fixed plate 2 close to the other fixed plate 2, which can also improve the friction between the fixed plate 2 and the test sample 5, thereby improving the clamping force on the test sample 5.

[0040] In some technical schemes, optionally, as shown in Figure 1 and Figure 4 The clamp assembly 100 further comprises two transmission rods 41, each transmission rod 41 can pass through one side wall 14 and is threadedly connected with the corresponding fixed plate 2; two guide rods 42, each guide rod 42 is connected with one side wall 14, and the fixed plate 2 is provided with a guide hole 28, the guide rod 42 can be inserted into the guide hole 28 for guiding the movement direction of the corresponding fixed plate 2; wherein the two transmission rods 41 can rotate, and under the action of the guide rod 42, the two fixed plates 2 can be close to or away from each other.

[0041] In the technical scheme, the clamp assembly 100 further comprises transmission rods 41 and guide rods 42, each transmission rod 41 can pass through one side wall 14 and is threadedly connected with the corresponding fixed plate 2, each guide rod 42 is connected with one side wall 14, and the fixed plate 2 is provided with a guide hole 28, the guide rod 42 can be inserted into the guide hole 28 for guiding the movement direction of the corresponding fixed plate 2. Further, the two transmission rods 41 can rotate, and two limiting pieces (not shown) are further provided, one limiting piece is provided on each side wall 14, and the two limiting pieces can limit the movement of the corresponding transmission rod 41 in the first direction, that is, the relative movement direction of the two fixed plates 2, so that when the two transmission rods 41 rotate along their own axes, the transmission rod 41 is threadedly connected with the fixed plate 2, so that under the guidance of the guide rod 42, the rotary force can be converted into driving force in the first direction, thereby enabling the two fixed plates 2 to be close to or away from each other.

[0042] In some technical schemes, optionally, in order to realize the mutual approach or mutual departure of the two fixed plates 2, a small air cylinder can also be provided on one side wall 14, the output rod of the air cylinder penetrates through the side wall 14 and is connected with one fixed plate 2, and drives the fixed plate 2 to move towards or away from the other fixed plate 2. This scheme can also realize the mutual approach or mutual departure of the two fixed plates 2.

[0043] In some technical schemes, optionally, as shown in Figure 1 and Figure 2As shown in the drawings, each side wall 14 comprises two first connecting holes 422 arranged transversely and two second connecting holes 424 arranged longitudinally, wherein the clamp assembly 100 comprises a first clamping state and a second clamping state, in the first clamping state, as shown in the drawings, the guide rods 42 can pass through the first connecting holes 422 and the guide holes 28 of the two fixed plates 2, and the test samples 5 are fixed by the hanging pins 3, so as to complete "suspension fixing", in the second clamping state, as shown in the drawings, the guide rods 42 can pass through the second connecting holes 424 and the guide holes 28 of the two fixed plates 2, and the test samples 5 are clamped and fixed by the two fixed plates 2, so as to complete "clamping fixing". Figure 5 As shown in the drawings, each side wall 14 comprises two first connecting holes 422 arranged transversely and two second connecting holes 424 arranged longitudinally, wherein the clamp assembly 100 comprises a first clamping state and a second clamping state, in the first clamping state, as shown in the drawings, the guide rods 42 can pass through the first connecting holes 422 and the guide holes 28 of the two fixed plates 2, and the test samples 5 are fixed by the hanging pins 3, so as to complete "suspension fixing", in the second clamping state, as shown in the drawings, the guide rods 42 can pass through the second connecting holes 424 and the guide holes 28 of the two fixed plates 2, and the test samples 5 are clamped and fixed by the two fixed plates 2, so as to complete "clamping fixing". Figure 6 As shown in the drawings, each side wall 14 comprises two first connecting holes 422 arranged transversely and two second connecting holes 424 arranged longitudinally, wherein the clamp assembly 100 comprises a first clamping state and a second clamping state, in the first clamping state, as shown in the drawings, the guide rods 42 can pass through the first connecting holes 422 and the guide holes 28 of the two fixed plates 2, and the test samples 5 are fixed by the hanging pins 3, so as to complete "suspension fixing", in the second clamping state, as shown in the drawings, the guide rods 42 can pass through the second connecting holes 424 and the guide holes 28 of the two fixed plates 2, and the test samples 5 are clamped and fixed by the two fixed plates 2, so as to complete "clamping fixing".

[0044] In the technical scheme, the clamp assembly 100 comprises a first clamping state and a second clamping state, in the first clamping state, the guide rods 42 can pass through the first connecting holes 422 and the guide holes 28 of the fixed plates 2, and the test samples 5 are "suspension fixed" by the hanging pins 3, in the second clamping state, the two fixed plates 2 can be rotated by 90 degrees clockwise or counterclockwise, so that the guide rods 42 can pass through the second connecting holes 424 and the guide holes 28 of the two fixed plates 2, and the test samples 5 are "clamped and fixed" by the two fixed plates 2.

[0045] In some technical schemes, as shown in the drawings, the clamp assembly 100 further comprises a force adding rod 43, and each transmission rod 41 is provided with a force adding rod 43 away from the fixed plate 2. Figure 1

[0046] In the technical scheme, each transmission rod 41 is provided with a force adding rod 43 away from the fixed plate 2, so that the user can conveniently rotate the transmission rod 41, thereby saving time and effort when fixing the test sample 5.

[0047] In some technical schemes, as shown in the drawings, each fixed plate 2 comprises a clamping part plate 22 and a connecting part plate 24, the clamping part plate 22 is arranged in the groove 16 and is in sliding connection with the side wall 14, and the connecting part plate 24 is located outside the groove 16. Figure 1

[0048] In the technical scheme, the number of hanging pins 3 is two, and the two hanging pins 3 are arranged on the connecting part plate 24, so that two test samples 5 can be "suspension fixed" at the same time, thereby completing the tensile test of two test samples 5 at one time, of course, according to the requirement, the number of hanging pins 3 can also be set to be greater than or equal to 3. Further, the connecting part plate 24 is located outside the groove 16, which is more conducive to the assembly of the hanging pin 3.

[0049] ​​In some embodiments, the clamp assembly 100 is applied to the stretching device 7, the stretching device 7 comprises a driving device (not shown), and the clamp assembly 100 further comprises a mounting base rod 44, one end of which is connected with the top wall 12 and the other end of which is connected with the driving device.

[0050] In the technical scheme, the mounting base rod 44 is connected with the driving device, so that the stretching experiment is completed, and the driving device is used for providing a pulling force.

[0051] In some embodiments, as shown in Figure 1 the clamp assembly 100 further comprises a first locking nut 45, which is used for locking after the driving device is connected with the top of the mounting base rod 44.

[0052] In some embodiments, as shown in Figure 1 the clamp assembly 100 further comprises a second locking nut 46, which is used for locking after the external thread at the bottom of the mounting base rod 44 is screwed into the threaded hole at the top of the body 1. That is, the mounting base rod 44 is detachably connected with the body 1 and can be locked by the second locking nut 46.

[0053] The clamp assembly 100 of the utility model can clamp the test sample 5 of different types and different sizes for hard foam stretching test, solves the problems of many types of hard foam stretching clamps and high test cost, and brings great convenience for test activities.

[0054] As shown in Figure 5 and Figure 6 the utility model provides a stretching device 7 in the second aspect of the technical scheme, which comprises two clamp assemblies 100 provided in any one of the first aspect of the utility model.

[0055] In the embodiments according to the utility model, the terms "first", "second" and "third" are only used for the aspect of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two, unless otherwise clearly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connecting" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meanings of the above terms in the embodiments according to the utility model can be understood according to the specific circumstances.

[0056] Moreover, while operations are depicted in a particular order, this should not be understood as requiring such an order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing can be advantageous. Likewise, while several specific implementation details are contained in the above discussion, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of particular implementations. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination.

[0057] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

[0058] The above merely provides preferred embodiments of the embodiments of the present application, and is not intended to limit the embodiments of the present application. For those skilled in the art, various modifications and changes can be made to the embodiments of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included in the scope of protection of the embodiments of the present application.

Claims

1. A clamp assembly, characterized by The utility model relates to a clamp assembly, comprising: a body comprising a top wall and two side walls, the top wall and the two side walls forming a groove; two fixing plates, at least part of the fixing plates being arranged in the groove, and the two fixing plates being connected to one of the side walls respectively, and the two fixing plates being capable of moving closer to each other or farther away from each other, and capable of clamping a sample when the two fixing plates move closer to each other; a hanging pin, the two fixing plates each comprising a through hole, the hanging pin passing through the through holes of the two fixing plates and being connected to the two fixing plates, and the hanging pin being used for fixing a sample.

2. The clamp assembly of claim 1, wherein, Further comprising: a concave-convex structure arranged on a surface of each of the fixing plates close to the other fixing plate, the concave-convex structure being capable of contacting the sample and clamping the sample when the two fixing plates move closer to each other.

3. The clamp assembly of claim 1, wherein, Further comprising: two transmission rods, each of the transmission rods being capable of passing through one of the side walls and being threadedly connected to the corresponding fixing plate; two guide rods, each of the guide rods being connected to one of the side walls, and the fixing plate being provided with a guide hole, the guide rod being capable of being inserted into the guide hole and being used for guiding the movement direction of the corresponding fixing plate; wherein the two transmission rods are each capable of rotating, and under the action of the guide rod, the two fixing plates are capable of moving closer to each other or farther away from each other.

4. The clamp assembly of claim 3, wherein, Each of the side walls comprises two first connection holes arranged transversely and two second connection holes arranged longitudinally, wherein the clamp assembly comprises a first clamping state and a second clamping state, in the first clamping state, each of the guide rods is capable of passing through the first connection hole and the guide hole and fixing the sample through the hanging pin, and in the second clamping state, each of the guide rods is capable of passing through the second connection hole and the guide hole and clamping and fixing the sample through the two fixing plates.

5. The clamp assembly of claim 3, wherein, Further comprising: a force applying rod, one of the force applying rods being arranged at an end of each of the transmission rods away from the fixing plate.

6. The clamp assembly of claim 1, wherein, Each of the fixing plates comprises: a clamping part plate, the clamping part plate being arranged in the groove; a connecting part plate, the number of the hanging pins being two, the two hanging pins being connected to the connecting part plate, and the connecting part plate being located outside the groove.

7. The clamp assembly of claim 1, wherein, The clamp assembly is applied to a stretching device, the stretching device comprising a driving device, and the clamp assembly further comprising: a mounting base rod, one end of the mounting base rod being connected to the top wall, and the other end of the mounting base rod being connected to the driving device.

8. A stretching device characterized by comprising: The utility model relates to two clamp assemblies as claimed in any one of claims 1 to 7. ​

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